Issue #1258 - Part 1: Import mailnews, ldap, and mork from comm-esr52.9.1

11 files changed, 7395 insertions, 0 deletions

diff --git a/mailnews/extensions/newsblog/content/Feed.js b/mailnews/extensions/newsblog/content/Feed.js
new file mode 100644
index 000000000..7e47260a8
--- /dev/null
+++ b/mailnews/extensions/newsblog/content/Feed.js
@@ -0,0 +1,620 @@
+/* -*- Mode: JavaScript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Cache for all of the feeds currently being downloaded, indexed by URL,
+// so the load event listener can access the Feed objects after it finishes
+// downloading the feed.
+var FeedCache =
+{
+  mFeeds: {},
+
+  putFeed: function (aFeed)
+  {
+    this.mFeeds[this.normalizeHost(aFeed.url)] = aFeed;
+  },
+
+  getFeed: function (aUrl)
+  {
+    let index = this.normalizeHost(aUrl);
+    if (index in this.mFeeds)
+      return this.mFeeds[index];
+
+    return null;
+  },
+
+  removeFeed: function (aUrl)
+  {
+    let index = this.normalizeHost(aUrl);
+    if (index in this.mFeeds)
+      delete this.mFeeds[index];
+  },
+
+  normalizeHost: function (aUrl)
+  {
+    try
+    {
+      let normalizedUrl = Services.io.newURI(aUrl, null, null);
+      normalizedUrl.host = normalizedUrl.host.toLowerCase();
+      return normalizedUrl.spec
+    }
+    catch (ex)
+    {
+      return aUrl;
+    }
+  }
+};
+
+function Feed(aResource, aRSSServer)
+{
+  this.resource = aResource.QueryInterface(Ci.nsIRDFResource);
+  this.server = aRSSServer;
+}
+
+Feed.prototype = 
+{
+  description: null,
+  author: null,
+  request: null,
+  server: null,
+  downloadCallback: null,
+  resource: null,
+  items: new Array(),
+  itemsStored: 0,
+  mFolder: null,
+  mInvalidFeed: false,
+  mFeedType: null,
+  mLastModified: null,
+
+  get folder()
+  {
+    return this.mFolder;
+  },
+
+  set folder (aFolder)
+  {
+    this.mFolder = aFolder;
+  },
+
+  get name()
+  {
+    // Used for the feed's title in Subcribe dialog and opml export.
+    let name = this.title || this.description || this.url;
+    return name.replace(/[\n\r\t]+/g, " ").replace(/[\x00-\x1F]+/g, "");
+  },
+
+  get folderName()
+  {
+    if (this.mFolderName)
+      return this.mFolderName;
+
+    // Get a unique sanitized name. Use title or description as a base;
+    // these are mandatory by spec. Length of 80 is plenty.
+    let folderName = (this.title || this.description || "").substr(0,80);
+    let defaultName = FeedUtils.strings.GetStringFromName("ImportFeedsNew");
+    return this.mFolderName = FeedUtils.getSanitizedFolderName(this.server.rootMsgFolder,
+                                                               folderName,
+                                                               defaultName,
+                                                               true);
+  },
+
+  download: function(aParseItems, aCallback)
+  {
+     // May be null.
+    this.downloadCallback = aCallback;
+
+    // Whether or not to parse items when downloading and parsing the feed.
+    // Defaults to true, but setting to false is useful for obtaining
+    // just the title of the feed when the user subscribes to it.
+    this.parseItems = aParseItems == null ? true : aParseItems ? true : false;
+
+    // Before we do anything, make sure the url is an http url.  This is just
+    // a sanity check so we don't try opening mailto urls, imap urls, etc. that
+    // the user may have tried to subscribe to as an rss feed.
+    if (!FeedUtils.isValidScheme(this.url))
+    {
+       // Simulate an invalid feed error.
+      FeedUtils.log.info("Feed.download: invalid protocol for - " + this.url);
+      this.onParseError(this);
+      return;
+    }
+
+    // Before we try to download the feed, make sure we aren't already
+    // processing the feed by looking up the url in our feed cache.
+    if (FeedCache.getFeed(this.url))
+    {
+      if (this.downloadCallback)
+        this.downloadCallback.downloaded(this, FeedUtils.kNewsBlogFeedIsBusy);
+      // Return, the feed is already in use.
+      return;
+    }
+
+    if (Services.io.offline) {
+      // If offline and don't want to go online, just add the feed subscription;
+      // it can be verified later (the folder name will be the url if not adding
+      // to an existing folder). Only for subscribe actions; passive biff and
+      // active get new messages are handled prior to getting here.
+      let win = Services.wm.getMostRecentWindow("mail:3pane");
+      if (!win.MailOfflineMgr.getNewMail()) {
+        this.storeNextItem();
+        return;
+      }
+    }
+
+    this.request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].
+                   createInstance(Ci.nsIXMLHttpRequest);
+    // Must set onProgress before calling open.
+    this.request.onprogress = this.onProgress;
+    this.request.open("GET", this.url, true);
+    this.request.channel.loadFlags |= Ci.nsIRequest.LOAD_BYPASS_CACHE |
+                                      Ci.nsIRequest.INHIBIT_CACHING;
+
+    // Some servers, if sent If-Modified-Since, will send 304 if subsequently
+    // not sent If-Modified-Since, as in the case of an unsubscribe and new
+    // subscribe.  Send start of century date to force a download; some servers
+    // will 304 on older dates (such as epoch 1970).
+    let lastModified = this.lastModified || "Sat, 01 Jan 2000 00:00:00 GMT";
+    this.request.setRequestHeader("If-Modified-Since", lastModified);
+
+    // Only order what you're going to eat...
+    this.request.responseType = "document";
+    this.request.overrideMimeType("text/xml");
+    this.request.setRequestHeader("Accept", FeedUtils.REQUEST_ACCEPT);
+    this.request.timeout = FeedUtils.REQUEST_TIMEOUT;
+    this.request.onload = this.onDownloaded;
+    this.request.onerror = this.onDownloadError;
+    this.request.ontimeout = this.onDownloadError;
+    FeedCache.putFeed(this);
+    this.request.send(null);
+  },
+
+  onDownloaded: function(aEvent)
+  {
+    let request = aEvent.target;
+    let isHttp = request.channel.originalURI.scheme.startsWith("http");
+    let url = request.channel.originalURI.spec;
+    if (isHttp && (request.status < 200 || request.status >= 300))
+    {
+      Feed.prototype.onDownloadError(aEvent);
+      return;
+    }
+
+    FeedUtils.log.debug("Feed.onDownloaded: got a download - " + url);
+    let feed = FeedCache.getFeed(url);
+    if (!feed)
+      throw new Error("Feed.onDownloaded: error - couldn't retrieve feed " +
+                      "from cache");
+
+    // If the server sends a Last-Modified header, store the property on the
+    // feed so we can use it when making future requests, to avoid downloading
+    // and parsing feeds that have not changed.  Don't update if merely checking
+    // the url, as for subscribe move/copy, as a subsequent refresh may get a 304.
+    // Save the response and persist it only upon successful completion of the
+    // refresh cycle (i.e. not if the request is cancelled).
+    let lastModifiedHeader = request.getResponseHeader("Last-Modified");
+    feed.mLastModified = (lastModifiedHeader && feed.parseItems) ?
+                           lastModifiedHeader : null;
+
+    // The download callback is called asynchronously when parse() is done.
+    feed.parse();
+  },
+  
+  onProgress: function(aEvent) 
+  {
+    let request = aEvent.target;
+    let url = request.channel.originalURI.spec;
+    let feed = FeedCache.getFeed(url);
+
+    if (feed.downloadCallback)
+      feed.downloadCallback.onProgress(feed, aEvent.loaded, aEvent.total,
+                                       aEvent.lengthComputable);
+  },
+
+  onDownloadError: function(aEvent)
+  {
+    let request = aEvent.target;
+    let url = request.channel.originalURI.spec;
+    let feed = FeedCache.getFeed(url);
+    if (feed.downloadCallback) 
+    {
+      // Generic network or 'not found' error initially.
+      let error = FeedUtils.kNewsBlogRequestFailure;
+
+      if (request.status == 304) {
+        // If the http status code is 304, the feed has not been modified
+        // since we last downloaded it and does not need to be parsed.
+        error = FeedUtils.kNewsBlogNoNewItems;
+      }
+      else {
+        let [errType, errName] = FeedUtils.createTCPErrorFromFailedXHR(request);
+        FeedUtils.log.info("Feed.onDownloaded: request errType:errName:statusCode - " +
+                           errType + ":" + errName + ":" + request.status);
+        if (errType == "SecurityCertificate")
+          // This is the code for nsINSSErrorsService.ERROR_CLASS_BAD_CERT
+          // overrideable security certificate errors.
+          error = FeedUtils.kNewsBlogBadCertError;
+
+        if (request.status == 401 || request.status == 403)
+          // Unauthorized or Forbidden.
+          error = FeedUtils.kNewsBlogNoAuthError;
+      }
+
+      feed.downloadCallback.downloaded(feed, error);
+    }
+
+    FeedCache.removeFeed(url);
+  },
+
+  onParseError: function(aFeed)
+  {
+    if (!aFeed)
+      return;
+
+    aFeed.mInvalidFeed = true;
+    if (aFeed.downloadCallback)
+      aFeed.downloadCallback.downloaded(aFeed, FeedUtils.kNewsBlogInvalidFeed);
+
+    FeedCache.removeFeed(aFeed.url);
+  },
+
+  onUrlChange: function(aFeed, aOldUrl)
+  {
+    if (!aFeed)
+      return;
+
+    // Simulate a cancel after a url update; next cycle will check the new url.
+    aFeed.mInvalidFeed = true;
+    if (aFeed.downloadCallback)
+      aFeed.downloadCallback.downloaded(aFeed, FeedUtils.kNewsBlogCancel);
+
+    FeedCache.removeFeed(aOldUrl);
+  },
+
+  get url()
+  {
+    let ds = FeedUtils.getSubscriptionsDS(this.server);
+    let url = ds.GetTarget(this.resource, FeedUtils.DC_IDENTIFIER, true);
+    if (url)
+      url = url.QueryInterface(Ci.nsIRDFLiteral).Value;
+    else
+      url = this.resource.ValueUTF8;
+
+    return url;
+  },
+
+  get title()
+  {
+    let ds = FeedUtils.getSubscriptionsDS(this.server);
+    let title = ds.GetTarget(this.resource, FeedUtils.DC_TITLE, true);
+    if (title)
+      title = title.QueryInterface(Ci.nsIRDFLiteral).Value;
+
+    return title;
+  },
+
+  set title (aNewTitle)
+  {
+    if (!aNewTitle)
+      return;
+
+    let ds = FeedUtils.getSubscriptionsDS(this.server);
+    aNewTitle = FeedUtils.rdf.GetLiteral(aNewTitle);
+    let old_title = ds.GetTarget(this.resource, FeedUtils.DC_TITLE, true);
+    if (old_title)
+        ds.Change(this.resource, FeedUtils.DC_TITLE, old_title, aNewTitle);
+    else
+        ds.Assert(this.resource, FeedUtils.DC_TITLE, aNewTitle, true);
+  },
+
+  get lastModified()
+  {
+    let ds = FeedUtils.getSubscriptionsDS(this.server);
+    let lastModified = ds.GetTarget(this.resource,
+                                    FeedUtils.DC_LASTMODIFIED,
+                                    true);
+    if (lastModified)
+      lastModified = lastModified.QueryInterface(Ci.nsIRDFLiteral).Value;
+
+    return lastModified;
+  },
+
+  set lastModified(aLastModified)
+  {
+    let ds = FeedUtils.getSubscriptionsDS(this.server);
+    aLastModified = FeedUtils.rdf.GetLiteral(aLastModified);
+    let old_lastmodified = ds.GetTarget(this.resource,
+                                        FeedUtils.DC_LASTMODIFIED,
+                                        true);
+    if (old_lastmodified)
+      ds.Change(this.resource, FeedUtils.DC_LASTMODIFIED,
+                old_lastmodified, aLastModified);
+    else
+      ds.Assert(this.resource, FeedUtils.DC_LASTMODIFIED, aLastModified, true);
+  },
+
+  get quickMode ()
+  {
+    let ds = FeedUtils.getSubscriptionsDS(this.server);
+    let quickMode = ds.GetTarget(this.resource, FeedUtils.FZ_QUICKMODE, true);
+    if (quickMode)
+    {
+      quickMode = quickMode.QueryInterface(Ci.nsIRDFLiteral);
+      quickMode = quickMode.Value == "true";
+    }
+
+    return quickMode;
+  },
+
+  set quickMode (aNewQuickMode)
+  {
+    let ds = FeedUtils.getSubscriptionsDS(this.server);
+    aNewQuickMode = FeedUtils.rdf.GetLiteral(aNewQuickMode);
+    let old_quickMode = ds.GetTarget(this.resource, 
+                                     FeedUtils.FZ_QUICKMODE,
+                                     true);
+    if (old_quickMode)
+      ds.Change(this.resource, FeedUtils.FZ_QUICKMODE,
+                old_quickMode, aNewQuickMode);
+    else
+      ds.Assert(this.resource, FeedUtils.FZ_QUICKMODE,
+                aNewQuickMode, true);
+  },
+
+  get options ()
+  {
+    let ds = FeedUtils.getSubscriptionsDS(this.server);
+    let options = ds.GetTarget(this.resource, FeedUtils.FZ_OPTIONS, true);
+    if (options)
+      return JSON.parse(options.QueryInterface(Ci.nsIRDFLiteral).Value);
+
+    return null;
+  },
+
+  set options (aOptions)
+  {
+    let newOptions = aOptions ? FeedUtils.newOptions(aOptions) :
+                                FeedUtils._optionsDefault;
+    let ds = FeedUtils.getSubscriptionsDS(this.server);
+    newOptions = FeedUtils.rdf.GetLiteral(JSON.stringify(newOptions));
+    let oldOptions = ds.GetTarget(this.resource, FeedUtils.FZ_OPTIONS, true);
+    if (oldOptions)
+      ds.Change(this.resource, FeedUtils.FZ_OPTIONS, oldOptions, newOptions);
+    else
+      ds.Assert(this.resource, FeedUtils.FZ_OPTIONS, newOptions, true);
+  },
+
+  categoryPrefs: function ()
+  {
+    let categoryPrefsAcct = FeedUtils.getOptionsAcct(this.server).category;
+    if (!this.options)
+      return categoryPrefsAcct;
+
+    return this.options.category;
+  },
+
+  get link ()
+  {
+    let ds = FeedUtils.getSubscriptionsDS(this.server);
+    let link = ds.GetTarget(this.resource, FeedUtils.RSS_LINK, true);
+    if (link)
+      link = link.QueryInterface(Ci.nsIRDFLiteral).Value;
+
+    return link;
+  },
+
+  set link (aNewLink)
+  {
+    if (!aNewLink)
+      return;
+
+    let ds = FeedUtils.getSubscriptionsDS(this.server);
+    aNewLink = FeedUtils.rdf.GetLiteral(aNewLink);
+    let old_link = ds.GetTarget(this.resource, FeedUtils.RSS_LINK, true);
+    if (old_link)
+      ds.Change(this.resource, FeedUtils.RSS_LINK, old_link, aNewLink);
+    else
+      ds.Assert(this.resource, FeedUtils.RSS_LINK, aNewLink, true);
+  },
+
+  parse: function()
+  {
+    // Create a feed parser which will parse the feed.
+    let parser = new FeedParser();
+    this.itemsToStore = parser.parseFeed(this, this.request.responseXML);
+    parser = null;
+
+    if (this.mInvalidFeed)
+    {
+      this.request = null;
+      this.mInvalidFeed = false;
+      return;
+    }
+
+    // storeNextItem() will iterate through the parsed items, storing each one.
+    this.itemsToStoreIndex = 0;
+    this.itemsStored = 0;
+    this.storeNextItem();
+  },
+
+  invalidateItems: function ()
+  {
+    let ds = FeedUtils.getItemsDS(this.server);
+    FeedUtils.log.debug("Feed.invalidateItems: for url - " + this.url);
+    let items = ds.GetSources(FeedUtils.FZ_FEED, this.resource, true);
+    let item;
+
+    while (items.hasMoreElements())
+    {
+      item = items.getNext();
+      item = item.QueryInterface(Ci.nsIRDFResource);
+      FeedUtils.log.trace("Feed.invalidateItems: item - " + item.Value);
+      let valid = ds.GetTarget(item, FeedUtils.FZ_VALID, true);
+      if (valid)
+        ds.Unassert(item, FeedUtils.FZ_VALID, valid, true);
+    }
+  },
+
+  removeInvalidItems: function(aDeleteFeed)
+  {
+    let ds = FeedUtils.getItemsDS(this.server);
+    FeedUtils.log.debug("Feed.removeInvalidItems: for url - " + this.url);
+    let items = ds.GetSources(FeedUtils.FZ_FEED, this.resource, true);
+    let item;
+    let currentTime = new Date().getTime();
+    while (items.hasMoreElements())
+    {
+      item = items.getNext();
+      item = item.QueryInterface(Ci.nsIRDFResource);
+
+      if (ds.HasAssertion(item, FeedUtils.FZ_VALID,
+                          FeedUtils.RDF_LITERAL_TRUE, true))
+        continue;
+
+      let lastSeenTime = ds.GetTarget(item, FeedUtils.FZ_LAST_SEEN_TIMESTAMP, true);
+      if (lastSeenTime)
+        lastSeenTime = parseInt(lastSeenTime.QueryInterface(Ci.nsIRDFLiteral).Value)
+      else
+        lastSeenTime = 0;
+
+      if ((currentTime - lastSeenTime) < FeedUtils.INVALID_ITEM_PURGE_DELAY &&
+          !aDeleteFeed)
+        // Don't immediately purge items in active feeds; do so for deleted feeds.
+        continue;
+
+      FeedUtils.log.trace("Feed.removeInvalidItems: item - " + item.Value);
+      ds.Unassert(item, FeedUtils.FZ_FEED, this.resource, true);
+      if (ds.hasArcOut(item, FeedUtils.FZ_FEED))
+        FeedUtils.log.debug("Feed.removeInvalidItems: " + item.Value +
+                            " is from more than one feed; only the reference to" +
+                            " this feed removed");
+      else
+        FeedUtils.removeAssertions(ds, item);
+    }
+  },
+
+  createFolder: function()
+  {
+    if (this.folder)
+      return;
+
+    try {
+      this.folder = this.server.rootMsgFolder
+                               .QueryInterface(Ci.nsIMsgLocalMailFolder)
+                               .createLocalSubfolder(this.folderName);
+    }
+    catch (ex) {
+      // An error creating.
+      FeedUtils.log.info("Feed.createFolder: error creating folder - '"+
+                          this.folderName+"' in parent folder "+
+                          this.server.rootMsgFolder.filePath.path + " -- "+ex);
+      // But its remnants are still there, clean up.
+      let xfolder = this.server.rootMsgFolder.getChildNamed(this.folderName);
+      this.server.rootMsgFolder.propagateDelete(xfolder, true, null);
+    }
+  },
+
+  // Gets the next item from itemsToStore and forces that item to be stored
+  // to the folder.  If more items are left to be stored, fires a timer for
+  // the next one, otherwise triggers a download done notification to the UI.
+  storeNextItem: function()
+  {
+    if (FeedUtils.CANCEL_REQUESTED)
+    {
+      FeedUtils.CANCEL_REQUESTED = false;
+      this.cleanupParsingState(this, FeedUtils.kNewsBlogCancel);
+      return;
+    }
+
+    if (!this.itemsToStore || !this.itemsToStore.length)
+    {
+      let code = FeedUtils.kNewsBlogSuccess;
+      this.createFolder();
+      if (!this.folder)
+        code = FeedUtils.kNewsBlogFileError;
+      this.cleanupParsingState(this, code);
+      return;
+    }
+
+    let item = this.itemsToStore[this.itemsToStoreIndex];
+
+    if (item.store())
+      this.itemsStored++;
+
+    if (!this.folder)
+    {
+      this.cleanupParsingState(this, FeedUtils.kNewsBlogFileError);
+      return;
+    }
+
+    this.itemsToStoreIndex++;
+
+    // If the listener is tracking progress for each item, report it here.
+    if (item.feed.downloadCallback && item.feed.downloadCallback.onFeedItemStored)
+      item.feed.downloadCallback.onFeedItemStored(item.feed,
+                                                  this.itemsToStoreIndex,
+                                                  this.itemsToStore.length);
+
+    // Eventually we'll report individual progress here.
+
+    if (this.itemsToStoreIndex < this.itemsToStore.length)
+    {
+      if (!this.storeItemsTimer)
+        this.storeItemsTimer = Cc["@mozilla.org/timer;1"].
+                               createInstance(Ci.nsITimer);
+      this.storeItemsTimer.initWithCallback(this, 50, Ci.nsITimer.TYPE_ONE_SHOT);
+    }
+    else
+    {
+      // We have just finished downloading one or more feed items into the
+      // destination folder; if the folder is still listed as having new
+      // messages in it, then we should set the biff state on the folder so the
+      // right RDF UI changes happen in the folder pane to indicate new mail.
+      if (item.feed.folder.hasNewMessages)
+      {
+        item.feed.folder.biffState = Ci.nsIMsgFolder.nsMsgBiffState_NewMail;
+        // Run the bayesian spam filter, if enabled.
+        item.feed.folder.callFilterPlugins(null);
+      }
+
+      this.cleanupParsingState(this, FeedUtils.kNewsBlogSuccess);
+    }
+  },
+
+  cleanupParsingState: function(aFeed, aCode)
+  {
+    // Now that we are done parsing the feed, remove the feed from the cache.
+    FeedCache.removeFeed(aFeed.url);
+
+    if (aFeed.parseItems)
+    {
+      // Do this only if we're in parse/store mode.
+      aFeed.removeInvalidItems(false);
+
+      if (aCode == FeedUtils.kNewsBlogSuccess && aFeed.mLastModified)
+        aFeed.lastModified = aFeed.mLastModified;
+
+      // Flush any feed item changes to disk.
+      let ds = FeedUtils.getItemsDS(aFeed.server);
+      ds.Flush();
+      FeedUtils.log.debug("Feed.cleanupParsingState: items stored - " + this.itemsStored);
+    }
+
+    // Force the xml http request to go away.  This helps reduce some nasty
+    // assertions on shut down.
+    this.request = null;
+    this.itemsToStore = "";
+    this.itemsToStoreIndex = 0;
+    this.itemsStored = 0;
+    this.storeItemsTimer = null;
+
+    if (aFeed.downloadCallback)
+      aFeed.downloadCallback.downloaded(aFeed, aCode);
+  },
+
+  // nsITimerCallback
+  notify: function(aTimer)
+  {
+    this.storeNextItem();
+  }
+};
diff --git a/mailnews/extensions/newsblog/content/FeedItem.js b/mailnews/extensions/newsblog/content/FeedItem.js
new file mode 100644
index 000000000..09e4eb861
--- /dev/null
+++ b/mailnews/extensions/newsblog/content/FeedItem.js
@@ -0,0 +1,490 @@
+/* -*- Mode: JavaScript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+function FeedItem()
+{
+  this.mDate = FeedUtils.getValidRFC5322Date();
+  this.mUnicodeConverter = Cc["@mozilla.org/intl/scriptableunicodeconverter"].
+                           createInstance(Ci.nsIScriptableUnicodeConverter);
+  this.mParserUtils = Cc["@mozilla.org/parserutils;1"].
+                      getService(Ci.nsIParserUtils);
+}
+
+FeedItem.prototype =
+{
+  // Only for IETF Atom.
+  xmlContentBase: null,
+  id: null,
+  feed: null,
+  description: null,
+  content: null,
+  enclosures: [],
+  title: null,
+  author: "anonymous",
+  inReplyTo: "",
+  keywords: [],
+  mURL: null,
+  characterSet: "UTF-8",
+
+  ENCLOSURE_BOUNDARY_PREFIX: "--------------", // 14 dashes
+  ENCLOSURE_HEADER_BOUNDARY_PREFIX: "------------", // 12 dashes
+  MESSAGE_TEMPLATE: '\n' +
+    '<html>\n' +
+    '  <head>\n' +
+    '    <title>%TITLE%</title>\n' +
+    '    <base href="%BASE%">\n' +
+    '  </head>\n' +
+    '  <body id="msgFeedSummaryBody" selected="false">\n' +
+    '    %CONTENT%\n' +
+    '  </body>\n' +
+    '</html>\n',
+
+  get url()
+  {
+    return this.mURL;
+  },
+
+  set url(aVal)
+  {
+    try
+    {
+      this.mURL = Services.io.newURI(aVal, null, null).spec;
+    }
+    catch(ex)
+    {
+      // The url as published or constructed can be a non url.  It's used as a
+      // feeditem identifier in feeditems.rdf, as a messageId, and as an href
+      // and for the content-base header.  Save as is; ensure not null.
+      this.mURL = aVal ? aVal : "";
+    }
+  },
+
+  get date()
+  {
+    return this.mDate;
+  },
+
+  set date (aVal)
+  {
+    this.mDate = aVal;
+  },
+
+  get identity ()
+  {
+    return this.feed.name + ": " + this.title + " (" + this.id + ")"
+  },
+
+  normalizeMessageID: function(messageID)
+  {
+    // Escape occurrences of message ID meta characters <, >, and @.
+    messageID.replace(/</g, "%3C");
+    messageID.replace(/>/g, "%3E");
+    messageID.replace(/@/g, "%40");
+    messageID = "<" + messageID.trim() + "@" + "localhost.localdomain" + ">";
+
+    FeedUtils.log.trace("FeedItem.normalizeMessageID: messageID - " + messageID);
+    return messageID;
+  },
+
+  get itemUniqueURI()
+  {
+    return this.createURN(this.id);
+  },
+
+  get contentBase()
+  {
+    if(this.xmlContentBase)
+      return this.xmlContentBase
+    else
+      return this.mURL;
+  },
+
+  store: function()
+  {
+    // this.title and this.content contain HTML.
+    // this.mUrl and this.contentBase contain plain text.
+
+    let stored = false;
+    let resource = this.findStoredResource();
+    if (!this.feed.folder)
+      return stored;
+
+    if (resource == null)
+    {
+      resource = FeedUtils.rdf.GetResource(this.itemUniqueURI);
+      if (!this.content)
+      {
+        FeedUtils.log.trace("FeedItem.store: " + this.identity +
+                            " no content; storing description or title");
+        this.content = this.description || this.title;
+      }
+
+      let content = this.MESSAGE_TEMPLATE;
+      content = content.replace(/%TITLE%/, this.title);
+      content = content.replace(/%BASE%/, this.htmlEscape(this.contentBase));
+      content = content.replace(/%CONTENT%/, this.content);
+      this.content = content;
+      this.writeToFolder();
+      this.markStored(resource);
+      stored = true;
+    }
+    this.markValid(resource);
+    return stored;
+  },
+
+  findStoredResource: function()
+  {
+    // Checks to see if the item has already been stored in its feed's
+    // message folder.
+    FeedUtils.log.trace("FeedItem.findStoredResource: checking if stored - " +
+                        this.identity);
+
+    let server = this.feed.server;
+    let folder = this.feed.folder;
+
+    if (!folder)
+    {
+      FeedUtils.log.debug("FeedItem.findStoredResource: folder '" +
+                          this.feed.folderName +
+                          "' doesn't exist; creating as child of " +
+                          server.rootMsgFolder.prettyName + "\n");
+      this.feed.createFolder();
+      return null;
+    }
+
+    let ds = FeedUtils.getItemsDS(server);
+    let itemURI = this.itemUniqueURI;
+    let itemResource = FeedUtils.rdf.GetResource(itemURI);
+
+    let downloaded = ds.GetTarget(itemResource, FeedUtils.FZ_STORED, true);
+
+    if (!downloaded ||
+        downloaded.QueryInterface(Ci.nsIRDFLiteral).Value == "false")
+    {
+      FeedUtils.log.trace("FeedItem.findStoredResource: not stored");
+      return null;
+    }
+
+    FeedUtils.log.trace("FeedItem.findStoredResource: already stored");
+    return itemResource;
+  },
+
+  markValid: function(resource)
+  {
+    let ds = FeedUtils.getItemsDS(this.feed.server);
+
+    let newTimeStamp = FeedUtils.rdf.GetLiteral(new Date().getTime());
+    let currentTimeStamp = ds.GetTarget(resource,
+                                        FeedUtils.FZ_LAST_SEEN_TIMESTAMP,
+                                        true);
+    if (currentTimeStamp)
+      ds.Change(resource, FeedUtils.FZ_LAST_SEEN_TIMESTAMP,
+                currentTimeStamp, newTimeStamp);
+    else
+      ds.Assert(resource, FeedUtils.FZ_LAST_SEEN_TIMESTAMP,
+                newTimeStamp, true);
+
+    if (!ds.HasAssertion(resource, FeedUtils.FZ_FEED,
+                         FeedUtils.rdf.GetResource(this.feed.url), true))
+      ds.Assert(resource, FeedUtils.FZ_FEED,
+                FeedUtils.rdf.GetResource(this.feed.url), true);
+
+    if (ds.hasArcOut(resource, FeedUtils.FZ_VALID))
+    {
+      let currentValue = ds.GetTarget(resource, FeedUtils.FZ_VALID, true);
+      ds.Change(resource, FeedUtils.FZ_VALID,
+                currentValue, FeedUtils.RDF_LITERAL_TRUE);
+    }
+    else
+      ds.Assert(resource, FeedUtils.FZ_VALID, FeedUtils.RDF_LITERAL_TRUE, true);
+  },
+
+  markStored: function(resource)
+  {
+    let ds = FeedUtils.getItemsDS(this.feed.server);
+
+    if (!ds.HasAssertion(resource, FeedUtils.FZ_FEED,
+                         FeedUtils.rdf.GetResource(this.feed.url), true))
+      ds.Assert(resource, FeedUtils.FZ_FEED,
+                FeedUtils.rdf.GetResource(this.feed.url), true);
+
+    let currentValue;
+    if (ds.hasArcOut(resource, FeedUtils.FZ_STORED))
+    {
+      currentValue = ds.GetTarget(resource, FeedUtils.FZ_STORED, true);
+      ds.Change(resource, FeedUtils.FZ_STORED, 
+                currentValue, FeedUtils.RDF_LITERAL_TRUE);
+    }
+    else
+      ds.Assert(resource, FeedUtils.FZ_STORED,
+                FeedUtils.RDF_LITERAL_TRUE, true);
+  },
+
+  mimeEncodeSubject: function(aSubject, aCharset)
+  {
+    // This routine sometimes throws exceptions for mis-encoded data so
+    // wrap it with a try catch for now.
+    let newSubject;
+    try
+    {
+      newSubject = mailServices.mimeConverter.encodeMimePartIIStr_UTF8(aSubject,
+                     false,
+                     aCharset, 9, 72);
+    }
+    catch (ex)
+    {
+      newSubject = aSubject;
+    }
+
+    return newSubject;
+  },
+
+  writeToFolder: function()
+  {
+    FeedUtils.log.trace("FeedItem.writeToFolder: " + this.identity +
+                        " writing to message folder " + this.feed.name);
+    // Convert the title to UTF-16 before performing our HTML entity
+    // replacement reg expressions.
+    let title = this.title;
+
+    // The subject may contain HTML entities.  Convert these to their unencoded
+    // state. i.e. &amp; becomes '&'.
+    title = this.mParserUtils.convertToPlainText(
+        title,
+        Ci.nsIDocumentEncoder.OutputSelectionOnly |
+        Ci.nsIDocumentEncoder.OutputAbsoluteLinks,
+        0);
+
+    // Compress white space in the subject to make it look better.  Trim
+    // leading/trailing spaces to prevent mbox header folding issue at just
+    // the right subject length.
+    title = title.replace(/[\t\r\n]+/g, " ").trim();
+
+    this.title = this.mimeEncodeSubject(title, this.characterSet);
+
+    // If the date looks like it's in W3C-DTF format, convert it into
+    // an IETF standard date.  Otherwise assume it's in IETF format.
+    if (this.mDate.search(/^\d\d\d\d/) != -1)
+      this.mDate = new Date(this.mDate).toUTCString();
+
+    // If there is an inreplyto value, create the headers.
+    let inreplytoHdrsStr = this.inReplyTo ?
+      ("References: " + this.inReplyTo + "\n" +
+       "In-Reply-To: " + this.inReplyTo + "\n") : "";
+
+    // If there are keywords (categories), create the headers. In the case of
+    // a longer than RFC5322 recommended line length, create multiple folded
+    // lines (easier to parse than multiple Keywords headers).
+    let keywordsStr = "";
+    if (this.keywords.length)
+    {
+      let HEADER = "Keywords: ";
+      let MAXLEN = 78;
+      keywordsStr = HEADER;
+      let keyword;
+      let keywords = [].concat(this.keywords);
+      let lines = [];
+      while (keywords.length)
+      {
+        keyword = keywords.shift();
+        if (keywordsStr.length + keyword.length > MAXLEN)
+        {
+          lines.push(keywordsStr)
+          keywordsStr = " ".repeat(HEADER.length);
+        }
+        keywordsStr += keyword + ",";
+      }
+      keywordsStr = keywordsStr.replace(/,$/,"\n");
+      lines.push(keywordsStr)
+      keywordsStr = lines.join("\n");
+    }
+
+    // Escape occurrences of "From " at the beginning of lines of
+    // content per the mbox standard, since "From " denotes a new
+    // message, and add a line break so we know the last line has one.
+    this.content = this.content.replace(/([\r\n]+)(>*From )/g, "$1>$2");
+    this.content += "\n";
+
+    // The opening line of the message, mandated by standards to start
+    // with "From ".  It's useful to construct this separately because
+    // we not only need to write it into the message, we also need to
+    // use it to calculate the offset of the X-Mozilla-Status lines from
+    // the front of the message for the statusOffset property of the
+    // DB header object.
+    let openingLine = 'From - ' + this.mDate + '\n';
+
+    let source =
+      openingLine +
+      'X-Mozilla-Status: 0000\n' +
+      'X-Mozilla-Status2: 00000000\n' +
+      'X-Mozilla-Keys: ' + " ".repeat(80) + '\n' +
+      'Received: by localhost; ' + FeedUtils.getValidRFC5322Date() + '\n' +
+      'Date: ' + this.mDate + '\n' +
+      'Message-Id: ' + this.normalizeMessageID(this.id) + '\n' +
+      'From: ' + this.author + '\n' +
+      'MIME-Version: 1.0\n' +
+      'Subject: ' + this.title + '\n' +
+      inreplytoHdrsStr +
+      keywordsStr +
+      'Content-Transfer-Encoding: 8bit\n' +
+      'Content-Base: ' + this.mURL + '\n';
+
+    if (this.enclosures.length)
+    {
+      let boundaryID = source.length;
+      source += 'Content-Type: multipart/mixed; boundary="' +
+                this.ENCLOSURE_HEADER_BOUNDARY_PREFIX + boundaryID + '"' + '\n\n' +
+                'This is a multi-part message in MIME format.\n' +
+                this.ENCLOSURE_BOUNDARY_PREFIX + boundaryID + '\n' +
+                'Content-Type: text/html; charset=' + this.characterSet + '\n' +
+                'Content-Transfer-Encoding: 8bit\n' +
+                this.content;
+
+      this.enclosures.forEach(function(enclosure) {
+        source += enclosure.convertToAttachment(boundaryID);
+      });
+
+      source += this.ENCLOSURE_BOUNDARY_PREFIX + boundaryID + '--' + '\n\n\n';
+    }
+    else
+      source += 'Content-Type: text/html; charset=' + this.characterSet + '\n' +
+                this.content;
+
+    FeedUtils.log.trace("FeedItem.writeToFolder: " + this.identity +
+                        " is " + source.length + " characters long");
+
+    // Get the folder and database storing the feed's messages and headers.
+    let folder = this.feed.folder.QueryInterface(Ci.nsIMsgLocalMailFolder);
+    let msgFolder = folder.QueryInterface(Ci.nsIMsgFolder);
+    msgFolder.gettingNewMessages = true;
+    // Source is a unicode string, we want to save a char * string in
+    // the original charset. So convert back.
+    this.mUnicodeConverter.charset = this.characterSet;
+    let msgDBHdr = folder.addMessage(this.mUnicodeConverter.ConvertFromUnicode(source));
+    msgDBHdr.OrFlags(Ci.nsMsgMessageFlags.FeedMsg);
+    msgFolder.gettingNewMessages = false;
+    this.tagItem(msgDBHdr, this.keywords);
+  },
+
+/**
+ * Autotag messages.
+ *
+ * @param  nsIMsgDBHdr aMsgDBHdr - message to tag
+ * @param  array aKeywords       - keywords (tags)
+ */
+  tagItem: function(aMsgDBHdr, aKeywords)
+  {
+    let categoryPrefs = this.feed.categoryPrefs();
+    if (!aKeywords.length || !categoryPrefs.enabled)
+      return;
+
+    let msgArray = Cc["@mozilla.org/array;1"].createInstance(Ci.nsIMutableArray);
+    msgArray.appendElement(aMsgDBHdr, false);
+
+    let prefix = categoryPrefs.prefixEnabled ? categoryPrefs.prefix : "";
+    let rtl = Services.prefs.getIntPref("bidi.direction") == 2;
+
+    let keys = [];
+    for (let keyword of aKeywords)
+    {
+      keyword = rtl ? keyword + prefix : prefix + keyword;
+      let keyForTag = MailServices.tags.getKeyForTag(keyword);
+      if (!keyForTag)
+      {
+        // Add the tag if it doesn't exist.
+        MailServices.tags.addTag(keyword, "", FeedUtils.AUTOTAG);
+        keyForTag = MailServices.tags.getKeyForTag(keyword);
+      }
+
+      // Add the tag key to the keys array.
+      keys.push(keyForTag);
+    }
+
+    if (keys.length)
+      // Add the keys to the message.
+      aMsgDBHdr.folder.addKeywordsToMessages(msgArray, keys.join(" "));
+  },
+
+  htmlEscape: function(s)
+  {
+    s = s.replace(/&/g, "&amp;");
+    s = s.replace(/>/g, "&gt;");
+    s = s.replace(/</g, "&lt;");
+    s = s.replace(/'/g, "&#39;");
+    s = s.replace(/"/g, "&quot;");
+    return s;
+  },
+
+  createURN: function(aName)
+  {
+    // Returns name as a URN in the 'feeditem' namespace. The returned URN is
+    // (or is intended to be) RFC2141 compliant.
+    // The builtin encodeURI provides nearly the exact encoding functionality
+    // required by the RFC.  The exceptions are that NULL characters should not
+    // appear, and that #, /, ?, &, and ~ should be escaped.
+    // NULL characters are removed before encoding.
+
+    let name = aName.replace(/\0/g, "");
+    let encoded = encodeURI(name);
+    encoded = encoded.replace(/\#/g, "%23");
+    encoded = encoded.replace(/\//g, "%2f");
+    encoded = encoded.replace(/\?/g, "%3f");
+    encoded = encoded.replace(/\&/g, "%26");
+    encoded = encoded.replace(/\~/g, "%7e");
+
+    return FeedUtils.FZ_ITEM_NS + encoded;
+  }
+};
+
+
+// A feed enclosure is to RSS what an attachment is for e-mail.  We make
+// enclosures look like attachments in the UI.
+function FeedEnclosure(aURL, aContentType, aLength, aTitle)
+{
+  this.mURL = aURL;
+  // Store a reasonable mimetype if content-type is not present.
+  this.mContentType = aContentType || "application/unknown";
+  this.mLength = aLength;
+  this.mTitle = aTitle;
+
+  // Generate a fileName from the URL.
+  if (this.mURL)
+  {
+    try
+    {
+      this.mFileName = Services.io.newURI(this.mURL, null, null).
+                                   QueryInterface(Ci.nsIURL).
+                                   fileName;
+    }
+    catch(ex)
+    {
+      this.mFileName = this.mURL;
+    }
+  }
+}
+
+FeedEnclosure.prototype =
+{
+  mURL: "",
+  mContentType: "",
+  mLength: 0,
+  mFileName: "",
+  mTitle: "",
+  ENCLOSURE_BOUNDARY_PREFIX: "--------------", // 14 dashes
+
+  // Returns a string that looks like an e-mail attachment which represents
+  // the enclosure.
+  convertToAttachment: function(aBoundaryID)
+  {
+    return '\n' +
+      this.ENCLOSURE_BOUNDARY_PREFIX + aBoundaryID + '\n' +
+      'Content-Type: ' + this.mContentType +
+                     '; name="' + (this.mTitle || this.mFileName) +
+                     (this.mLength ? '"; size=' + this.mLength : '"') + '\n' +
+      'X-Mozilla-External-Attachment-URL: ' + this.mURL + '\n' +
+      'Content-Disposition: attachment; filename="' + this.mFileName + '"\n\n' +
+      FeedUtils.strings.GetStringFromName("externalAttachmentMsg") + '\n';
+  }
+};
diff --git a/mailnews/extensions/newsblog/content/FeedUtils.jsm b/mailnews/extensions/newsblog/content/FeedUtils.jsm
new file mode 100644
index 000000000..6d5e64dd2
--- /dev/null
+++ b/mailnews/extensions/newsblog/content/FeedUtils.jsm
@@ -0,0 +1,1608 @@
+/* -*- Mode: JavaScript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+this.EXPORTED_SYMBOLS = ["Feed", "FeedItem", "FeedParser", "FeedUtils"];
+
+var {classes: Cc, interfaces: Ci, utils: Cu} = Components;
+
+Cu.import("resource:///modules/gloda/log4moz.js");
+Cu.import("resource:///modules/mailServices.js");
+Cu.import("resource:///modules/MailUtils.js");
+Cu.import("resource:///modules/jsmime.jsm");
+Cu.import("resource://gre/modules/FileUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+Services.scriptloader.loadSubScript("chrome://messenger-newsblog/content/Feed.js");
+Services.scriptloader.loadSubScript("chrome://messenger-newsblog/content/FeedItem.js");
+Services.scriptloader.loadSubScript("chrome://messenger-newsblog/content/feed-parser.js");
+
+var FeedUtils = {
+  MOZ_PARSERERROR_NS: "http://www.mozilla.org/newlayout/xml/parsererror.xml",
+
+  RDF_SYNTAX_NS: "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
+  RDF_SYNTAX_TYPE: "http://www.w3.org/1999/02/22-rdf-syntax-ns#type",
+  get RDF_TYPE() { return this.rdf.GetResource(this.RDF_SYNTAX_TYPE) },
+
+  RSS_090_NS: "http://my.netscape.com/rdf/simple/0.9/",
+
+  RSS_NS: "http://purl.org/rss/1.0/",
+  get RSS_CHANNEL()     { return this.rdf.GetResource(this.RSS_NS + "channel") },
+  get RSS_TITLE()       { return this.rdf.GetResource(this.RSS_NS + "title") },
+  get RSS_DESCRIPTION() { return this.rdf.GetResource(this.RSS_NS + "description") },
+  get RSS_ITEMS()       { return this.rdf.GetResource(this.RSS_NS + "items") },
+  get RSS_ITEM()        { return this.rdf.GetResource(this.RSS_NS + "item") },
+  get RSS_LINK()        { return this.rdf.GetResource(this.RSS_NS + "link") },
+
+  RSS_CONTENT_NS: "http://purl.org/rss/1.0/modules/content/",
+  get RSS_CONTENT_ENCODED() {
+    return this.rdf.GetResource(this.RSS_CONTENT_NS + "encoded");
+  },
+
+  DC_NS: "http://purl.org/dc/elements/1.1/",
+  get DC_CREATOR()      { return this.rdf.GetResource(this.DC_NS + "creator") },
+  get DC_SUBJECT()      { return this.rdf.GetResource(this.DC_NS + "subject") },
+  get DC_DATE()         { return this.rdf.GetResource(this.DC_NS + "date") },
+  get DC_TITLE()        { return this.rdf.GetResource(this.DC_NS + "title") },
+  get DC_LASTMODIFIED() { return this.rdf.GetResource(this.DC_NS + "lastModified") },
+  get DC_IDENTIFIER()   { return this.rdf.GetResource(this.DC_NS + "identifier") },
+
+  MRSS_NS: "http://search.yahoo.com/mrss/",
+  FEEDBURNER_NS: "http://rssnamespace.org/feedburner/ext/1.0",
+  ITUNES_NS: "http://www.itunes.com/dtds/podcast-1.0.dtd",
+
+  FZ_NS: "urn:forumzilla:",
+  FZ_ITEM_NS: "urn:feeditem:",
+  get FZ_ROOT()       { return this.rdf.GetResource(this.FZ_NS + "root") },
+  get FZ_FEEDS()      { return this.rdf.GetResource(this.FZ_NS + "feeds") },
+  get FZ_FEED()       { return this.rdf.GetResource(this.FZ_NS + "feed") },
+  get FZ_QUICKMODE()  { return this.rdf.GetResource(this.FZ_NS + "quickMode") },
+  get FZ_DESTFOLDER() { return this.rdf.GetResource(this.FZ_NS + "destFolder") },
+  get FZ_STORED()     { return this.rdf.GetResource(this.FZ_NS + "stored") },
+  get FZ_VALID()      { return this.rdf.GetResource(this.FZ_NS + "valid") },
+  get FZ_OPTIONS()    { return this.rdf.GetResource(this.FZ_NS + "options"); },
+  get FZ_LAST_SEEN_TIMESTAMP() {
+    return this.rdf.GetResource(this.FZ_NS + "last-seen-timestamp");
+  },
+
+  get RDF_LITERAL_TRUE()  { return this.rdf.GetLiteral("true") },
+  get RDF_LITERAL_FALSE() { return this.rdf.GetLiteral("false") },
+
+  // Atom constants
+  ATOM_03_NS: "http://purl.org/atom/ns#",
+  ATOM_IETF_NS: "http://www.w3.org/2005/Atom",
+  ATOM_THREAD_NS: "http://purl.org/syndication/thread/1.0",
+
+  // Accept content mimetype preferences for feeds.
+  REQUEST_ACCEPT: "application/atom+xml," +
+                  "application/rss+xml;q=0.9," +
+                  "application/rdf+xml;q=0.8," +
+                  "application/xml;q=0.7,text/xml;q=0.7," +
+                  "*/*;q=0.1",
+  // Timeout for nonresponse to request, 30 seconds.
+  REQUEST_TIMEOUT: 30 * 1000,
+
+  // The approximate amount of time, specified in milliseconds, to leave an
+  // item in the RDF cache after the item has dissappeared from feeds.
+  // The delay is currently one day.
+  INVALID_ITEM_PURGE_DELAY: 24 * 60 * 60 * 1000,
+
+  kBiffMinutesDefault: 100,
+  kNewsBlogSuccess: 0,
+  // Usually means there was an error trying to parse the feed.
+  kNewsBlogInvalidFeed: 1,
+  // Generic networking failure when trying to download the feed.
+  kNewsBlogRequestFailure: 2,
+  kNewsBlogFeedIsBusy: 3,
+  // For 304 Not Modified; There are no new articles for this feed.
+  kNewsBlogNoNewItems: 4,
+  kNewsBlogCancel: 5,
+  kNewsBlogFileError: 6,
+  // Invalid certificate, for overridable user exception errors.
+  kNewsBlogBadCertError: 7,
+  // For 401 Unauthorized or 403 Forbidden.
+  kNewsBlogNoAuthError: 8,
+
+  CANCEL_REQUESTED: false,
+  AUTOTAG: "~AUTOTAG",
+
+/**
+ * Get all rss account servers rootFolders.
+ *
+ * @return array of nsIMsgIncomingServer (empty array if none).
+ */
+  getAllRssServerRootFolders: function() {
+    let rssRootFolders = [];
+    let allServers = MailServices.accounts.allServers;
+    for (let i = 0; i < allServers.length; i++)
+    {
+      let server = allServers.queryElementAt(i, Ci.nsIMsgIncomingServer);
+      if (server && server.type == "rss")
+        rssRootFolders.push(server.rootFolder);
+    }
+
+    // By default, Tb sorts by hostname, ie Feeds, Feeds-1, and not by alpha
+    // prettyName.  Do the same as a stock install to match folderpane order.
+    rssRootFolders.sort(function(a, b) { return a.hostname > b.hostname });
+
+    return rssRootFolders;
+  },
+
+/**
+ * Create rss account.
+ *
+ * @param  string [aName] - optional account name to override default.
+ * @return nsIMsgAccount.
+ */
+  createRssAccount: function(aName) {
+    let userName = "nobody";
+    let hostName = "Feeds";
+    let hostNamePref = hostName;
+    let server;
+    let serverType = "rss";
+    let defaultName = FeedUtils.strings.GetStringFromName("feeds-accountname");
+    let i = 2;
+    while (MailServices.accounts.findRealServer(userName, hostName, serverType, 0))
+      // If "Feeds" exists, try "Feeds-2", then "Feeds-3", etc.
+      hostName = hostNamePref + "-" + i++;
+
+    server = MailServices.accounts.createIncomingServer(userName, hostName, serverType);
+    server.biffMinutes = FeedUtils.kBiffMinutesDefault;
+    server.prettyName = aName ? aName : defaultName;
+    server.valid = true;
+    let account = MailServices.accounts.createAccount();
+    account.incomingServer = server;
+
+    // Ensure the Trash folder db (.msf) is created otherwise folder/message
+    // deletes will throw until restart creates it.
+    server.msgStore.discoverSubFolders(server.rootMsgFolder, false);
+
+    // Create "Local Folders" if none exist yet as it's guaranteed that
+    // those exist when any account exists.
+    let localFolders;
+    try {
+      localFolders = MailServices.accounts.localFoldersServer;
+    }
+    catch (ex) {}
+
+    if (!localFolders)
+      MailServices.accounts.createLocalMailAccount();
+
+    // Save new accounts in case of a crash.
+    try {
+      MailServices.accounts.saveAccountInfo();
+    }
+    catch (ex) {
+      this.log.error("FeedUtils.createRssAccount: error on saveAccountInfo - " + ex);
+    }
+
+    this.log.debug("FeedUtils.createRssAccount: " +
+                   account.incomingServer.rootFolder.prettyName);
+
+    return account;
+  },
+
+/**
+ * Helper routine that checks our subscriptions list array and returns
+ * true if the url is already in our list.  This is used to prevent the
+ * user from subscribing to the same feed multiple times for the same server.
+ *
+ * @param  string aUrl                  - the url.
+ * @param  nsIMsgIncomingServer aServer - account server.
+ * @return boolean                      - true if exists else false.
+ */
+  feedAlreadyExists: function(aUrl, aServer) {
+    let ds = this.getSubscriptionsDS(aServer);
+    let feeds = this.getSubscriptionsList(ds);
+    let resource = this.rdf.GetResource(aUrl);
+    if (feeds.IndexOf(resource) == -1)
+      return false;
+
+    let folder = ds.GetTarget(resource, FeedUtils.FZ_DESTFOLDER, true)
+                   .QueryInterface(Ci.nsIRDFResource).ValueUTF8;
+    this.log.info("FeedUtils.feedAlreadyExists: feed url " + aUrl +
+                  " subscribed in folder url " + decodeURI(folder));
+
+    return true;
+  },
+
+/**
+ * Download a feed url on biff or get new messages.
+ *
+ * @param   nsIMsgFolder aFolder         - folder
+ * @param   nsIUrlListener aUrlListener  - feed url
+ * @param   bool aIsBiff                 - true if biff, false if manual get
+ * @param   nsIDOMWindow aMsgWindow      - window
+ */
+  downloadFeed: function(aFolder, aUrlListener, aIsBiff, aMsgWindow) {
+    if (Services.io.offline)
+      return;
+
+    // We don't yet support the ability to check for new articles while we are
+    // in the middle of subscribing to a feed. For now, abort the check for
+    // new feeds.
+    if (FeedUtils.progressNotifier.mSubscribeMode)
+    {
+      FeedUtils.log.warn("downloadFeed: Aborting RSS New Mail Check. " +
+                         "Feed subscription in progress\n");
+      return;
+    }
+
+    let allFolders = Cc["@mozilla.org/array;1"].createInstance(Ci.nsIMutableArray);
+    if (!aFolder.isServer) {
+      // Add the base folder; it does not get returned by ListDescendants. Do not
+      // add the account folder as it doesn't have the feedUrl property or even
+      // a msgDatabase necessarily.
+      allFolders.appendElement(aFolder, false);
+    }
+
+    aFolder.ListDescendants(allFolders);
+
+    let folder;
+    function* feeder() {
+      let numFolders = allFolders.length;
+      for (let i = 0; i < numFolders; i++) {
+        folder = allFolders.queryElementAt(i, Ci.nsIMsgFolder);
+        FeedUtils.log.debug("downloadFeed: START x/# foldername:uri - " +
+                            (i+1) + "/" + numFolders + " " +
+                            folder.name + ":" + folder.URI);
+
+        // Ensure folder's msgDatabase is openable for new message processing.
+        // If not, reparse. After the async reparse the folder will be ready
+        // for the next cycle; don't bother with a listener. Continue with
+        // the next folder, as attempting to add a message to a folder with
+        // an unavailable msgDatabase will throw later.
+        if (!FeedUtils.isMsgDatabaseOpenable(folder, true))
+          continue;
+
+        let feedUrlArray = FeedUtils.getFeedUrlsInFolder(folder);
+        // Continue if there are no feedUrls for the folder in the feeds
+        // database.  All folders in Trash are skipped.
+        if (!feedUrlArray)
+          continue;
+
+        FeedUtils.log.debug("downloadFeed: CONTINUE foldername:urlArray - " +
+                            folder.name + ":" + feedUrlArray);
+
+        FeedUtils.progressNotifier.init(aMsgWindow, false);
+
+        // We need to kick off a download for each feed.
+        let id, feed;
+        for (let url of feedUrlArray)
+        {
+          id = FeedUtils.rdf.GetResource(url);
+          feed = new Feed(id, folder.server);
+          feed.folder = folder;
+          // Bump our pending feed download count.
+          FeedUtils.progressNotifier.mNumPendingFeedDownloads++;
+          feed.download(true, FeedUtils.progressNotifier);
+          FeedUtils.log.debug("downloadFeed: DOWNLOAD feed url - " + url);
+
+          Services.tm.mainThread.dispatch(function() {
+            try {
+              let done = getFeed.next().done;
+              if (done) {
+                // Finished with all feeds in base folder and its subfolders.
+                FeedUtils.log.debug("downloadFeed: Finished with folder - " +
+                                    aFolder.name);
+                folder = null;
+                allFolders = null;
+              }
+            }
+            catch (ex) {
+              FeedUtils.log.error("downloadFeed: error - " + ex);
+              FeedUtils.progressNotifier.downloaded({name: folder.name}, 0);
+            }
+          }, Ci.nsIThread.DISPATCH_NORMAL);
+
+          yield undefined;
+        }
+      }
+    }
+
+    let getFeed = feeder();
+    try {
+      let done = getFeed.next().done;
+      if (done) {
+        // Nothing to do.
+        FeedUtils.log.debug("downloadFeed: Nothing to do in folder - " +
+                            aFolder.name);
+        folder = null;
+        allFolders = null;
+      }
+    }
+    catch (ex) {
+      FeedUtils.log.error("downloadFeed: error - " + ex);
+      FeedUtils.progressNotifier.downloaded({name: aFolder.name}, 0);
+    }
+  },
+
+/**
+ * Subscribe a new feed url.
+ *
+ * @param   string aUrl              - feed url
+ * @param   nsIMsgFolder aFolder     - folder
+ * @param   nsIDOMWindow aMsgWindow  - window
+ */
+  subscribeToFeed: function(aUrl, aFolder, aMsgWindow) {
+    // We don't support the ability to subscribe to several feeds at once yet.
+    // For now, abort the subscription if we are already in the middle of
+    // subscribing to a feed via drag and drop.
+    if (FeedUtils.progressNotifier.mNumPendingFeedDownloads)
+    {
+      FeedUtils.log.warn("subscribeToFeed: Aborting RSS subscription. " +
+                         "Feed downloads already in progress\n");
+      return;
+    }
+
+    // If aFolder is null, then use the root folder for the first RSS account.
+    if (!aFolder)
+      aFolder = FeedUtils.getAllRssServerRootFolders()[0];
+
+    // If the user has no Feeds account yet, create one.
+    if (!aFolder)
+      aFolder = FeedUtils.createRssAccount().incomingServer.rootFolder;
+
+    if (!aMsgWindow)
+    {
+      let wlist = Services.wm.getEnumerator("mail:3pane");
+      if (wlist.hasMoreElements())
+      {
+        let win = wlist.getNext().QueryInterface(Ci.nsIDOMWindow);
+        win.focus();
+        aMsgWindow = win.msgWindow;
+      }
+      else
+      {
+        // If there are no open windows, open one, pass it the URL, and
+        // during opening it will subscribe to the feed.
+        let arg = Cc["@mozilla.org/supports-string;1"].
+                  createInstance(Ci.nsISupportsString);
+        arg.data = aUrl;
+        Services.ww.openWindow(null, "chrome://messenger/content/",
+                               "_blank", "chrome,dialog=no,all", arg);
+        return;
+      }
+    }
+
+    // If aUrl is a feed url, then it is either of the form
+    // feed://example.org/feed.xml or feed:https://example.org/feed.xml.
+    // Replace feed:// with http:// per the spec, then strip off feed:
+    // for the second case.
+    aUrl = aUrl.replace(/^feed:\x2f\x2f/i, "http://");
+    aUrl = aUrl.replace(/^feed:/i, "");
+
+    // Make sure we aren't already subscribed to this feed before we attempt
+    // to subscribe to it.
+    if (FeedUtils.feedAlreadyExists(aUrl, aFolder.server))
+    {
+      aMsgWindow.statusFeedback.showStatusString(
+        FeedUtils.strings.GetStringFromName("subscribe-feedAlreadySubscribed"));
+      return;
+    }
+
+    let itemResource = FeedUtils.rdf.GetResource(aUrl);
+    let feed = new Feed(itemResource, aFolder.server);
+    feed.quickMode = feed.server.getBoolValue("quickMode");
+    feed.options = FeedUtils.getOptionsAcct(feed.server);
+
+    // If the root server, create a new folder for the feed.  The user must
+    // want us to add this subscription url to an existing RSS folder.
+    if (!aFolder.isServer)
+      feed.folder = aFolder;
+
+    FeedUtils.progressNotifier.init(aMsgWindow, true);
+    FeedUtils.progressNotifier.mNumPendingFeedDownloads++;
+    feed.download(true, FeedUtils.progressNotifier);
+  },
+
+/**
+ * Add a feed record to the feeds.rdf database and update the folder's feedUrl
+ * property.
+ *
+ * @param  object aFeed - our feed object
+ */
+  addFeed: function(aFeed) {
+    let ds = this.getSubscriptionsDS(aFeed.folder.server);
+    let feeds = this.getSubscriptionsList(ds);
+
+    // Generate a unique ID for the feed.
+    let id = aFeed.url;
+    let i = 1;
+    while (feeds.IndexOf(this.rdf.GetResource(id)) != -1 && ++i < 1000)
+      id = aFeed.url + i;
+    if (i == 1000)
+      throw new Error("FeedUtils.addFeed: couldn't generate a unique ID " +
+                      "for feed " + aFeed.url);
+
+    // Add the feed to the list.
+    id = this.rdf.GetResource(id);
+    feeds.AppendElement(id);
+    ds.Assert(id, this.RDF_TYPE, this.FZ_FEED, true);
+    ds.Assert(id, this.DC_IDENTIFIER, this.rdf.GetLiteral(aFeed.url), true);
+    if (aFeed.title)
+      ds.Assert(id, this.DC_TITLE, this.rdf.GetLiteral(aFeed.title), true);
+    ds.Assert(id, this.FZ_DESTFOLDER, aFeed.folder, true);
+    ds.Flush();
+
+    // Update folderpane.
+    this.setFolderPaneProperty(aFeed.folder, "favicon", null, "row");
+  },
+
+/**
+ * Delete a feed record from the feeds.rdf database and update the folder's
+ * feedUrl property.
+ *
+ * @param  nsIRDFResource aId           - feed url as rdf resource.
+ * @param  nsIMsgIncomingServer aServer - folder's account server.
+ * @param  nsIMsgFolder aParentFolder   - owning folder.
+ */
+  deleteFeed: function(aId, aServer, aParentFolder) {
+    let feed = new Feed(aId, aServer);
+    let ds = this.getSubscriptionsDS(aServer);
+
+    if (!feed || !ds)
+     return;
+
+    // Remove the feed from the subscriptions ds.
+    let feeds = this.getSubscriptionsList(ds);
+    let index = feeds.IndexOf(aId);
+    if (index != -1)
+      feeds.RemoveElementAt(index, false);
+
+    // Remove all assertions about the feed from the subscriptions database.
+    this.removeAssertions(ds, aId);
+    ds.Flush();
+
+    // Remove all assertions about items in the feed from the items database.
+    let itemds = this.getItemsDS(aServer);
+    feed.invalidateItems();
+    feed.removeInvalidItems(true);
+    itemds.Flush();
+
+    // Update folderpane.
+    this.setFolderPaneProperty(aParentFolder, "favicon", null, "row");
+  },
+
+/**
+ * Change an existing feed's url, as identified by FZ_FEED resource in the
+ * feeds.rdf subscriptions database.
+ *
+ * @param  obj aFeed      - the feed object
+ * @param  string aNewUrl - new url
+ * @return bool           - true if successful, else false
+ */
+  changeUrlForFeed: function(aFeed, aNewUrl) {
+    if (!aFeed || !aFeed.folder || !aNewUrl)
+      return false;
+
+    if (this.feedAlreadyExists(aNewUrl, aFeed.folder.server))
+    {
+      this.log.info("FeedUtils.changeUrlForFeed: new feed url " + aNewUrl +
+                    " already subscribed in account " + aFeed.folder.server.prettyName);
+      return false;
+    }
+
+    let title = aFeed.title;
+    let link = aFeed.link;
+    let quickMode = aFeed.quickMode;
+    let options = aFeed.options;
+
+    this.deleteFeed(this.rdf.GetResource(aFeed.url),
+                    aFeed.folder.server, aFeed.folder);
+    aFeed.resource = this.rdf.GetResource(aNewUrl)
+                             .QueryInterface(Ci.nsIRDFResource);
+    aFeed.title = title;
+    aFeed.link = link;
+    aFeed.quickMode = quickMode;
+    aFeed.options = options;
+    this.addFeed(aFeed);
+
+    let win = Services.wm.getMostRecentWindow("Mail:News-BlogSubscriptions");
+    if (win)
+      win.FeedSubscriptions.refreshSubscriptionView(aFeed.folder, aNewUrl);
+
+    return true;
+  },
+
+/**
+ * Get the list of feed urls for a folder, as identified by the FZ_DESTFOLDER
+ * tag, directly from the primary feeds.rdf subscriptions database.
+ *
+ * @param  nsIMsgFolder - the folder.
+ * @return array of urls, or null if none.
+ */
+  getFeedUrlsInFolder: function(aFolder) {
+    if (aFolder.isServer || aFolder.server.type != "rss" ||
+        aFolder.getFlag(Ci.nsMsgFolderFlags.Trash) ||
+        aFolder.getFlag(Ci.nsMsgFolderFlags.Virtual) ||
+        !aFolder.filePath.exists())
+      // There are never any feedUrls in the account/non-feed/trash/virtual
+      // folders or in a ghost folder (nonexistant on disk yet found in
+      // aFolder.subFolders).
+      return null;
+
+    let feedUrlArray = [];
+
+    // Get the list from the feeds database.
+    try {
+      let ds = this.getSubscriptionsDS(aFolder.server);
+      let enumerator = ds.GetSources(this.FZ_DESTFOLDER, aFolder, true);
+      while (enumerator.hasMoreElements())
+      {
+        let containerArc = enumerator.getNext();
+        let uri = containerArc.QueryInterface(Ci.nsIRDFResource).ValueUTF8;
+        feedUrlArray.push(uri);
+      }
+    }
+    catch(ex)
+    {
+      this.log.error("getFeedUrlsInFolder: feeds.rdf db error - " + ex);
+      this.log.error("getFeedUrlsInFolder: feeds.rdf db error for account - " +
+                     aFolder.server.serverURI + " : " + aFolder.server.prettyName);
+    }
+
+    return feedUrlArray.length ? feedUrlArray : null;
+  },
+
+/**
+ * Check if the folder's msgDatabase is openable, reparse if desired.
+ *
+ * @param  nsIMsgFolder aFolder - the folder
+ * @param  boolean aReparse     - reparse if true
+ * @return boolean              - true if msgDb is available, else false
+ */
+  isMsgDatabaseOpenable: function(aFolder, aReparse) {
+    let msgDb;
+    try {
+      msgDb = Cc["@mozilla.org/msgDatabase/msgDBService;1"]
+                .getService(Ci.nsIMsgDBService).openFolderDB(aFolder, true);
+    }
+    catch (ex) {}
+
+    if (msgDb)
+      return true;
+
+    if (!aReparse)
+      return false;
+
+    // Force a reparse.
+    FeedUtils.log.debug("checkMsgDb: rebuild msgDatabase for " +
+                        aFolder.name + " - " + aFolder.filePath.path);
+    try {
+      // Ignore error returns.
+      aFolder.QueryInterface(Ci.nsIMsgLocalMailFolder)
+             .getDatabaseWithReparse(null, null);
+    }
+    catch (ex) {}
+
+    return false;
+  },
+
+/**
+ * Update a folderpane cached property.
+ *
+ * @param  nsIMsgFolder aFolder   - folder
+ * @param  string aProperty       - property
+ * @param  string aValue          - value
+ * @param  string aInvalidate     - "row" = folder's row.
+ *                                  "all" = all rows.
+ */
+  setFolderPaneProperty: function(aFolder, aProperty, aValue, aInvalidate) {
+    let win = Services.wm.getMostRecentWindow("mail:3pane");
+    if (!aFolder || !aProperty || !win || !("gFolderTreeView" in win))
+      return;
+
+    win.gFolderTreeView.setFolderCacheProperty(aFolder, aProperty, aValue);
+
+    if (aInvalidate == "all") {
+      win.gFolderTreeView._tree.invalidate();
+    }
+    if (aInvalidate == "row") {
+      let row = win.gFolderTreeView.getIndexOfFolder(aFolder);
+      win.gFolderTreeView._tree.invalidateRow(row);
+    }
+  },
+
+/**
+ * Get the favicon for a feed folder subscription url (first one) or a feed
+ * message url. The favicon service caches it in memory if places history is
+ * not enabled.
+ *
+ * @param  nsIMsgFolder aFolder - the feed folder or null if aUrl
+ * @param  string aUrl          - a url (feed, message, other) or null if aFolder
+ * @param  string aIconUrl      - the icon url if already determined, else null
+ * @param  nsIDOMWindow aWindow - null if requesting url without setting it
+ * @param  function aCallback   - null or callback
+ * @return string               - the favicon url or empty string
+ */
+  getFavicon: function(aFolder, aUrl, aIconUrl, aWindow, aCallback) {
+    // On any error, cache an empty string to show the default favicon, and
+    // don't try anymore in this session.
+    let useDefaultFavicon = (() => {
+      if (aCallback)
+        aCallback("");
+      return "";
+    });
+
+    if (!Services.prefs.getBoolPref("browser.chrome.site_icons") ||
+        !Services.prefs.getBoolPref("browser.chrome.favicons"))
+      return useDefaultFavicon();
+
+    if (aIconUrl != null)
+      return aIconUrl;
+
+    let onLoadSuccess = (aEvent => {
+      let iconUri = Services.io.newURI(aEvent.target.src, null, null);
+      aWindow.specialTabs.mFaviconService.setAndFetchFaviconForPage(
+        uri, iconUri, false,
+        aWindow.specialTabs.mFaviconService.FAVICON_LOAD_NON_PRIVATE,
+        null, Services.scriptSecurityManager.getSystemPrincipal());
+
+      if (aCallback)
+        aCallback(iconUri.spec);
+    });
+
+    let onLoadError = (aEvent => {
+      useDefaultFavicon();
+      let url = aEvent.target.src;
+      aWindow.specialTabs.getFaviconFromPage(url, aCallback);
+    });
+
+    let url = aUrl;
+    if (!url)
+    {
+      // Get the proposed iconUrl from the folder's first subscribed feed's
+      // <link>.
+      if (!aFolder)
+        return useDefaultFavicon();
+
+      let feedUrls = this.getFeedUrlsInFolder(aFolder);
+      url = feedUrls ? feedUrls[0] : null;
+      if (!url)
+        return useDefaultFavicon();
+    }
+
+    if (aFolder)
+    {
+      let ds = this.getSubscriptionsDS(aFolder.server);
+      let resource = this.rdf.GetResource(url).QueryInterface(Ci.nsIRDFResource);
+      let feedLinkUrl = ds.GetTarget(resource, this.RSS_LINK, true);
+      feedLinkUrl = feedLinkUrl ?
+                      feedLinkUrl.QueryInterface(Ci.nsIRDFLiteral).Value : null;
+      url = feedLinkUrl && feedLinkUrl.startsWith("http") ? feedLinkUrl : url;
+    }
+
+    let uri, iconUri;
+    try {
+      uri = Services.io.newURI(url, null, null);
+      iconUri = Services.io.newURI(uri.prePath + "/favicon.ico", null, null);
+    }
+    catch (ex) {
+      return useDefaultFavicon();
+    }
+
+    if (!aWindow)
+      return iconUri.spec;
+
+    aWindow.specialTabs.loadFaviconImageNode(onLoadSuccess, onLoadError,
+                                             iconUri.spec);
+    // Cache the favicon url initially.
+    if (aCallback)
+      aCallback(iconUri.spec);
+
+    return iconUri.spec;
+  },
+
+/**
+ * Update the feeds.rdf database for rename and move/copy folder name changes.
+ *
+ * @param  nsIMsgFolder aFolder      - the folder, new if rename or target of
+ *                                      move/copy folder (new parent)
+ * @param  nsIMsgFolder aOrigFolder  - original folder
+ * @param  string aAction            - "move" or "copy" or "rename"
+ */
+  updateSubscriptionsDS: function(aFolder, aOrigFolder, aAction) {
+    this.log.debug("FeedUtils.updateSubscriptionsDS: " +
+                   "\nfolder changed - " + aAction +
+                   "\nnew folder  - " + aFolder.filePath.path +
+                   "\norig folder - " + aOrigFolder.filePath.path);
+
+    if (aFolder.server.type != "rss" || FeedUtils.isInTrash(aOrigFolder))
+      // Target not a feed account folder; nothing to do, or move/rename in
+      // trash; no subscriptions already.
+      return;
+
+    let newFolder = aFolder;
+    let newParentURI = aFolder.URI;
+    let origParentURI = aOrigFolder.URI;
+    if (aAction == "move" || aAction == "copy")
+    {
+      // Get the new folder. Don't process the entire parent (new dest folder)!
+      newFolder = aFolder.getChildNamed(aOrigFolder.name);
+      origParentURI = aOrigFolder.parent ? aOrigFolder.parent.URI :
+                                           aOrigFolder.rootFolder.URI;
+    }
+
+    this.updateFolderChangeInFeedsDS(newFolder, aOrigFolder, null, null);
+
+    // There may be subfolders, but we only get a single notification; iterate
+    // over all descendent folders of the folder whose location has changed.
+    let newSubFolders = Cc["@mozilla.org/array;1"].createInstance(Ci.nsIMutableArray);
+    newFolder.ListDescendants(newSubFolders);
+    for (let i = 0; i < newSubFolders.length; i++)
+    {
+      let newSubFolder = newSubFolders.queryElementAt(i, Ci.nsIMsgFolder);
+      FeedUtils.updateFolderChangeInFeedsDS(newSubFolder, aOrigFolder,
+                                            newParentURI, origParentURI)
+    }
+  },
+
+/**
+ * Update the feeds.rdf database with the new folder's or subfolder's location
+ * for rename and move/copy name changes. The feeds.rdf subscriptions db is
+ * also synced on cross account folder copies. Note that if a copied folder's
+ * url exists in the new account, its active subscription will be switched to
+ * the folder being copied, to enforce the one unique url per account design.
+ *
+ * @param  nsIMsgFolder aFolder      - new folder
+ * @param  nsIMsgFolder aOrigFolder  - original folder
+ * @param  string aNewAncestorURI    - for subfolders, ancestor new folder
+ * @param  string aOrigAncestorURI   - for subfolders, ancestor original folder
+ */
+  updateFolderChangeInFeedsDS: function(aFolder, aOrigFolder,
+                                        aNewAncestorURI, aOrigAncestorURI) {
+    this.log.debug("updateFolderChangeInFeedsDS: " +
+                   "\naFolder       - " + aFolder.URI +
+                   "\naOrigFolder   - " + aOrigFolder.URI +
+                   "\naOrigAncestor - " + aOrigAncestorURI +
+                   "\naNewAncestor  - " + aNewAncestorURI);
+
+    // Get the original folder's URI.
+    let folderURI = aFolder.URI;
+    let origURI = aNewAncestorURI && aOrigAncestorURI ?
+                    folderURI.replace(aNewAncestorURI, aOrigAncestorURI) :
+                    aOrigFolder.URI;
+    let origFolderRes = this.rdf.GetResource(origURI);
+    this.log.debug("updateFolderChangeInFeedsDS: urls origURI  - " + origURI);
+    // Get the original folder's url list from the feeds database.
+    let feedUrlArray = [];
+    let dsSrc = this.getSubscriptionsDS(aOrigFolder.server);
+    try {
+      let enumerator = dsSrc.GetSources(this.FZ_DESTFOLDER, origFolderRes, true);
+      while (enumerator.hasMoreElements())
+      {
+        let containerArc = enumerator.getNext();
+        let uri = containerArc.QueryInterface(Ci.nsIRDFResource).ValueUTF8;
+        feedUrlArray.push(uri);
+      }
+    }
+    catch(ex)
+    {
+      this.log.error("updateFolderChangeInFeedsDS: feeds.rdf db error for account - " +
+                     aOrigFolder.server.prettyName + " : " + ex);
+    }
+
+    if (!feedUrlArray.length)
+    {
+      this.log.debug("updateFolderChangeInFeedsDS: no feedUrls in this folder");
+      return;
+    }
+
+    let id, resource, node;
+    let ds = this.getSubscriptionsDS(aFolder.server);
+    for (let feedUrl of feedUrlArray)
+    {
+      this.log.debug("updateFolderChangeInFeedsDS: feedUrl - " + feedUrl);
+
+      id = this.rdf.GetResource(feedUrl);
+      // If move to trash, unsubscribe.
+      if (this.isInTrash(aFolder))
+      {
+        this.deleteFeed(id, aFolder.server, aFolder);
+      }
+      else
+      {
+        resource = this.rdf.GetResource(aFolder.URI);
+        // Get the node for the current folder URI.
+        node = ds.GetTarget(id, this.FZ_DESTFOLDER, true);
+        if (node)
+        {
+          ds.Change(id, this.FZ_DESTFOLDER, node, resource);
+        }
+        else
+        {
+          // If adding a new feed it's a cross account action; make sure to
+          // preserve all properties from the original datasource where
+          // available. Otherwise use the new folder's name and default server
+          // quickMode; preserve link and options.
+          let feedTitle = dsSrc.GetTarget(id, this.DC_TITLE, true);
+          feedTitle = feedTitle ? feedTitle.QueryInterface(Ci.nsIRDFLiteral).Value :
+                                  resource.name;
+          let link = dsSrc.GetTarget(id, FeedUtils.RSS_LINK, true);
+          link = link ? link.QueryInterface(Ci.nsIRDFLiteral).Value : "";
+          let quickMode = dsSrc.GetTarget(id, this.FZ_QUICKMODE, true);
+          quickMode = quickMode ? quickMode.QueryInterface(Ci.nsIRDFLiteral).Value :
+                                  null;
+          quickMode = quickMode == "true" ? true :
+                      quickMode == "false" ? false :
+                      aFeed.folder.server.getBoolValue("quickMode");
+          let options = dsSrc.GetTarget(id, this.FZ_OPTIONS, true);
+          options = options ? JSON.parse(options.QueryInterface(Ci.nsIRDFLiteral).Value) :
+                              this.optionsTemplate;
+
+          let feed = new Feed(id, aFolder.server);
+          feed.folder = aFolder;
+          feed.title = feedTitle;
+          feed.link = link;
+          feed.quickMode = quickMode;
+          feed.options = options;
+          this.addFeed(feed);
+        }
+      }
+    }
+
+    ds.Flush();
+  },
+
+/**
+ * When subscribing to feeds by dnd on, or adding a url to, the account
+ * folder (only), or creating folder structure via opml import, a subfolder is
+ * autocreated and thus the derived/given name must be sanitized to prevent
+ * filesystem errors. Hashing invalid chars based on OS rather than filesystem
+ * is not strictly correct.
+ *
+ * @param  nsIMsgFolder aParentFolder - parent folder
+ * @param  string       aProposedName - proposed name
+ * @param  string       aDefaultName  - default name if proposed sanitizes to
+ *                                      blank, caller ensures sane value
+ * @param  bool         aUnique       - if true, return a unique indexed name.
+ * @return string                     - sanitized unique name
+ */
+  getSanitizedFolderName: function(aParentFolder, aProposedName, aDefaultName, aUnique) {
+    // Clean up the name for the strictest fs (fat) and to ensure portability.
+    // 1) Replace line breaks and tabs '\n\r\t' with a space.
+    // 2) Remove nonprintable ascii.
+    // 3) Remove invalid win chars '* | \ / : < > ? "'.
+    // 4) Remove all '.' as starting/ending with one is trouble on osx/win.
+    // 5) No leading/trailing spaces.
+    let folderName = aProposedName.replace(/[\n\r\t]+/g, " ")
+                                  .replace(/[\x00-\x1F]+/g, "")
+                                  .replace(/[*|\\\/:<>?"]+/g, "")
+                                  .replace(/[\.]+/g, "")
+                                  .trim();
+
+    // Prefix with __ if name is:
+    // 1) a reserved win filename.
+    // 2) an undeletable/unrenameable special folder name (bug 259184).
+    if (folderName.toUpperCase()
+                  .match(/^COM\d$|^LPT\d$|^CON$|PRN$|^AUX$|^NUL$|^CLOCK\$/) ||
+        folderName.toUpperCase()
+                  .match(/^INBOX$|^OUTBOX$|^UNSENT MESSAGES$|^TRASH$/))
+      folderName = "__" + folderName;
+
+    // Use a default if no name is found.
+    if (!folderName)
+      folderName = aDefaultName;
+
+    if (!aUnique)
+      return folderName;
+
+    // Now ensure the folder name is not a dupe; if so append index.
+    let folderNameBase = folderName;
+    let i = 2;
+    while (aParentFolder.containsChildNamed(folderName))
+    {
+      folderName = folderNameBase + "-" + i++;
+    }
+
+    return folderName;
+  },
+
+/**
+ * This object will contain all feed specific properties.
+ */
+  _optionsDefault: {
+    version: 1,
+    // Autotag and <category> handling options.
+    category: {
+      enabled: false,
+      prefixEnabled: false,
+      prefix: null,
+    }
+  },
+
+  get optionsTemplate()
+  {
+    // Copy the object.
+    return JSON.parse(JSON.stringify(this._optionsDefault));
+  },
+
+  getOptionsAcct: function(aServer)
+  {
+    let optionsAcctPref = "mail.server." + aServer.key + ".feed_options";
+    try {
+      return JSON.parse(Services.prefs.getCharPref(optionsAcctPref));
+    }
+    catch (ex) {
+      this.setOptionsAcct(aServer, this._optionsDefault);
+      return JSON.parse(Services.prefs.getCharPref(optionsAcctPref));
+    }
+  },
+
+  setOptionsAcct: function(aServer, aOptions)
+  {
+    let optionsAcctPref = "mail.server." + aServer.key + ".feed_options";
+    let newOptions = this.newOptions(aOptions);
+    Services.prefs.setCharPref(optionsAcctPref, JSON.stringify(newOptions));
+  },
+
+  newOptions: function(aOptions)
+  {
+    // TODO: Clean options, so that only keys in the active template are stored.
+    return aOptions;
+  },
+
+  getSubscriptionsDS: function(aServer) {
+    if (this[aServer.serverURI] && this[aServer.serverURI]["FeedsDS"])
+      return this[aServer.serverURI]["FeedsDS"];
+
+    let file = this.getSubscriptionsFile(aServer);
+    let url = Services.io.getProtocolHandler("file").
+                          QueryInterface(Ci.nsIFileProtocolHandler).
+                          getURLSpecFromFile(file);
+
+    // GetDataSourceBlocking has a cache, so it's cheap to do this again
+    // once we've already done it once.
+    let ds = this.rdf.GetDataSourceBlocking(url);
+
+    if (!ds)
+      throw new Error("FeedUtils.getSubscriptionsDS: can't get feed " +
+                      "subscriptions data source - " + url);
+
+    if (!this[aServer.serverURI])
+      this[aServer.serverURI] = {};
+    return this[aServer.serverURI]["FeedsDS"] =
+             ds.QueryInterface(Ci.nsIRDFRemoteDataSource);
+  },
+
+  getSubscriptionsList: function(aDataSource) {
+    let list = aDataSource.GetTarget(this.FZ_ROOT, this.FZ_FEEDS, true);
+    list = list.QueryInterface(Ci.nsIRDFResource);
+    list = this.rdfContainerUtils.MakeSeq(aDataSource, list);
+    return list;
+  },
+
+  getSubscriptionsFile: function(aServer) {
+    aServer.QueryInterface(Ci.nsIRssIncomingServer);
+    let file = aServer.subscriptionsDataSourcePath;
+
+    // If the file doesn't exist, create it.
+    if (!file.exists())
+      this.createFile(file, this.FEEDS_TEMPLATE);
+
+    return file;
+  },
+
+  FEEDS_TEMPLATE: '<?xml version="1.0"?>\n' +
+    '<RDF:RDF xmlns:dc="http://purl.org/dc/elements/1.1/"\n' +
+    '         xmlns:fz="urn:forumzilla:"\n' +
+    '         xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#">\n' +
+    '  <RDF:Description about="urn:forumzilla:root">\n' +
+    '    <fz:feeds>\n' +
+    '      <RDF:Seq>\n' +
+    '      </RDF:Seq>\n' +
+    '    </fz:feeds>\n' +
+    '  </RDF:Description>\n' +
+    '</RDF:RDF>\n',
+
+  getItemsDS: function(aServer) {
+    if (this[aServer.serverURI] && this[aServer.serverURI]["FeedItemsDS"])
+      return this[aServer.serverURI]["FeedItemsDS"];
+
+    let file = this.getItemsFile(aServer);
+    let url = Services.io.getProtocolHandler("file").
+                          QueryInterface(Ci.nsIFileProtocolHandler).
+                          getURLSpecFromFile(file);
+
+    // GetDataSourceBlocking has a cache, so it's cheap to do this again
+    // once we've already done it once.
+    let ds = this.rdf.GetDataSourceBlocking(url);
+    if (!ds)
+      throw new Error("FeedUtils.getItemsDS: can't get feed items " +
+                      "data source - " + url);
+
+    // Note that it this point the datasource may not be loaded yet.
+    // You have to QueryInterface it to nsIRDFRemoteDataSource and check
+    // its "loaded" property to be sure.  You can also attach an observer
+    // which will get notified when the load is complete.
+    if (!this[aServer.serverURI])
+      this[aServer.serverURI] = {};
+    return this[aServer.serverURI]["FeedItemsDS"] =
+             ds.QueryInterface(Ci.nsIRDFRemoteDataSource);
+  },
+
+  getItemsFile: function(aServer) {
+    aServer.QueryInterface(Ci.nsIRssIncomingServer);
+    let file = aServer.feedItemsDataSourcePath;
+
+    // If the file doesn't exist, create it.
+    if (!file.exists()) {
+      this.createFile(file, this.FEEDITEMS_TEMPLATE);
+      return file;
+    }
+
+    // If feeditems.rdf is not sane, duplicate messages will occur repeatedly
+    // until the file is corrected; check that the file is valid XML. This is
+    // done lazily only once in a session.
+    let fileUrl = Services.io.getProtocolHandler("file")
+                             .QueryInterface(Ci.nsIFileProtocolHandler)
+                             .getURLSpecFromFile(file);
+    let request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"]
+                    .createInstance(Ci.nsIXMLHttpRequest);
+    request.open("GET", fileUrl, false);
+    request.responseType = "document";
+    request.send();
+    let dom = request.responseXML;
+    if (dom instanceof Ci.nsIDOMXMLDocument &&
+        dom.documentElement.namespaceURI != this.MOZ_PARSERERROR_NS)
+      return file;
+
+    // Error on the file. Rename it and create a new one.
+    this.log.debug("FeedUtils.getItemsFile: error in feeditems.rdf");
+    let errName = "feeditems_error_" +
+                  (new Date().toISOString()).replace(/\D/g, "") + ".rdf";
+    file.moveTo(file.parent, errName);
+    file = aServer.feedItemsDataSourcePath;
+    this.createFile(file, this.FEEDITEMS_TEMPLATE);
+    this.log.error("FeedUtils.getItemsFile: error in feeditems.rdf in account '" +
+                   aServer.prettyName + "'; the file has been moved to " +
+                   errName + " and a new file has been created. Recent messages " +
+                   "may be duplicated.");
+    return file;
+  },
+
+  FEEDITEMS_TEMPLATE: '<?xml version="1.0"?>\n' +
+    '<RDF:RDF xmlns:dc="http://purl.org/dc/elements/1.1/"\n' +
+    '         xmlns:fz="urn:forumzilla:"\n' +
+    '         xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#">\n' +
+    '</RDF:RDF>\n',
+
+  createFile: function(aFile, aTemplate) {
+    let fos = FileUtils.openSafeFileOutputStream(aFile);
+    fos.write(aTemplate, aTemplate.length);
+    FileUtils.closeSafeFileOutputStream(fos);
+  },
+
+  getParentTargetForChildResource: function(aChildResource, aParentTarget,
+                                            aServer) {
+    // Generic get feed property, based on child value. Assumes 1 unique
+    // child value with 1 unique parent, valid for feeds.rdf structure.
+    let ds = this.getSubscriptionsDS(aServer);
+    let childRes = this.rdf.GetResource(aChildResource);
+    let parent = null;
+
+    let arcsIn = ds.ArcLabelsIn(childRes);
+    while (arcsIn.hasMoreElements())
+    {
+      let arc = arcsIn.getNext();
+      if (arc instanceof Ci.nsIRDFResource)
+      {
+        parent = ds.GetSource(arc, childRes, true);
+        parent = parent.QueryInterface(Ci.nsIRDFResource);
+        break;
+      }
+    }
+
+    if (parent)
+    {
+      let resource = this.rdf.GetResource(parent.Value);
+      return ds.GetTarget(resource, aParentTarget, true);
+    }
+
+    return null;
+  },
+
+  removeAssertions: function(aDataSource, aResource) {
+    let properties = aDataSource.ArcLabelsOut(aResource);
+    let property;
+    while (properties.hasMoreElements())
+    {
+      property = properties.getNext();
+      let values = aDataSource.GetTargets(aResource, property, true);
+      let value;
+      while (values.hasMoreElements())
+      {
+        value = values.getNext();
+        aDataSource.Unassert(aResource, property, value, true);
+      }
+    }
+  },
+
+/**
+ * Dragging something from somewhere.  It may be a nice x-moz-url or from a
+ * browser or app that provides a less nice dataTransfer object in the event.
+ * Extract the url and if it passes the scheme test, try to subscribe.
+ *
+ * @param  nsIDOMDataTransfer aDataTransfer  - the dnd event's dataTransfer.
+ * @return nsIURI uri                        - a uri if valid, null if none.
+ */
+  getFeedUriFromDataTransfer: function(aDataTransfer) {
+    let dt = aDataTransfer;
+    let types = ["text/x-moz-url-data", "text/x-moz-url"];
+    let validUri = false;
+    let uri = Cc["@mozilla.org/network/standard-url;1"].
+              createInstance(Ci.nsIURI);
+
+    if (dt.getData(types[0]))
+    {
+      // The url is the data.
+      uri.spec = dt.mozGetDataAt(types[0], 0);
+      validUri = this.isValidScheme(uri);
+      this.log.trace("getFeedUriFromDataTransfer: dropEffect:type:value - " +
+                     dt.dropEffect + " : " + types[0] + " : " + uri.spec);
+    }
+    else if (dt.getData(types[1]))
+    {
+      // The url is the first part of the data, the second part is random.
+      uri.spec = dt.mozGetDataAt(types[1], 0).split("\n")[0];
+      validUri = this.isValidScheme(uri);
+      this.log.trace("getFeedUriFromDataTransfer: dropEffect:type:value - " +
+                     dt.dropEffect + " : " + types[0] + " : " + uri.spec);
+    }
+    else
+    {
+      // Go through the types and see if there's a url; get the first one.
+      for (let i = 0; i < dt.types.length; i++) {
+        let spec = dt.mozGetDataAt(dt.types[i], 0);
+        this.log.trace("getFeedUriFromDataTransfer: dropEffect:index:type:value - " +
+                       dt.dropEffect + " : " + i + " : " + dt.types[i] + " : "+spec);
+        try {
+          uri.spec = spec;
+          validUri = this.isValidScheme(uri);
+        }
+        catch(ex) {}
+
+        if (validUri)
+          break;
+      };
+    }
+
+    return validUri ? uri : null;
+  },
+
+  /**
+   * Returns security/certificate/network error details for an XMLHTTPRequest.
+   *
+   * @param  XMLHTTPRequest xhr - The xhr request.
+   * @return array [string errType, string errName] (null if not determined).
+   */
+  createTCPErrorFromFailedXHR: function(xhr) {
+    let status = xhr.channel.QueryInterface(Ci.nsIRequest).status;
+
+    let errType = null;
+    let errName = null;
+    if ((status & 0xff0000) === 0x5a0000) {
+      // Security module.
+      const nsINSSErrorsService = Ci.nsINSSErrorsService;
+      let nssErrorsService = Cc["@mozilla.org/nss_errors_service;1"]
+                               .getService(nsINSSErrorsService);
+      let errorClass;
+
+      // getErrorClass()) will throw a generic NS_ERROR_FAILURE if the error
+      // code is somehow not in the set of covered errors.
+      try {
+        errorClass = nssErrorsService.getErrorClass(status);
+      }
+      catch (ex) {
+        // Catch security protocol exception.
+        errorClass = "SecurityProtocol";
+      }
+
+      if (errorClass == nsINSSErrorsService.ERROR_CLASS_BAD_CERT) {
+        errType = "SecurityCertificate";
+      }
+      else {
+        errType = "SecurityProtocol";
+      }
+
+      // NSS_SEC errors (happen below the base value because of negative vals).
+      if ((status & 0xffff) < Math.abs(nsINSSErrorsService.NSS_SEC_ERROR_BASE)) {
+        // The bases are actually negative, so in our positive numeric space,
+        // we need to subtract the base off our value.
+        let nssErr = Math.abs(nsINSSErrorsService.NSS_SEC_ERROR_BASE) - (status & 0xffff);
+
+        switch (nssErr) {
+          case 11: // SEC_ERROR_EXPIRED_CERTIFICATE, sec(11)
+            errName = "SecurityExpiredCertificateError";
+            break;
+          case 12: // SEC_ERROR_REVOKED_CERTIFICATE, sec(12)
+            errName = "SecurityRevokedCertificateError";
+            break;
+
+          // Per bsmith, we will be unable to tell these errors apart very soon,
+          // so it makes sense to just folder them all together already.
+          case 13: // SEC_ERROR_UNKNOWN_ISSUER, sec(13)
+          case 20: // SEC_ERROR_UNTRUSTED_ISSUER, sec(20)
+          case 21: // SEC_ERROR_UNTRUSTED_CERT, sec(21)
+          case 36: // SEC_ERROR_CA_CERT_INVALID, sec(36)
+            errName = "SecurityUntrustedCertificateIssuerError";
+            break;
+          case 90: // SEC_ERROR_INADEQUATE_KEY_USAGE, sec(90)
+            errName = "SecurityInadequateKeyUsageError";
+            break;
+          case 176: // SEC_ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED, sec(176)
+            errName = "SecurityCertificateSignatureAlgorithmDisabledError";
+            break;
+          default:
+            errName = "SecurityError";
+            break;
+        }
+      }
+      else {
+        // Calculating the difference.
+        let sslErr = Math.abs(nsINSSErrorsService.NSS_SSL_ERROR_BASE) - (status & 0xffff);
+
+        switch (sslErr) {
+          case 3: // SSL_ERROR_NO_CERTIFICATE, ssl(3)
+            errName = "SecurityNoCertificateError";
+            break;
+          case 4: // SSL_ERROR_BAD_CERTIFICATE, ssl(4)
+            errName = "SecurityBadCertificateError";
+            break;
+          case 8: // SSL_ERROR_UNSUPPORTED_CERTIFICATE_TYPE, ssl(8)
+            errName = "SecurityUnsupportedCertificateTypeError";
+            break;
+          case 9: // SSL_ERROR_UNSUPPORTED_VERSION, ssl(9)
+            errName = "SecurityUnsupportedTLSVersionError";
+            break;
+          case 12: // SSL_ERROR_BAD_CERT_DOMAIN, ssl(12)
+            errName = "SecurityCertificateDomainMismatchError";
+            break;
+          default:
+            errName = "SecurityError";
+            break;
+        }
+      }
+    }
+    else {
+      errType = "Network";
+      switch (status) {
+        // Connect to host:port failed.
+        case 0x804B000C: // NS_ERROR_CONNECTION_REFUSED, network(13)
+          errName = "ConnectionRefusedError";
+          break;
+        // network timeout error.
+        case 0x804B000E: // NS_ERROR_NET_TIMEOUT, network(14)
+          errName = "NetworkTimeoutError";
+          break;
+        // Hostname lookup failed.
+        case 0x804B001E: // NS_ERROR_UNKNOWN_HOST, network(30)
+          errName = "DomainNotFoundError";
+          break;
+        case 0x804B0047: // NS_ERROR_NET_INTERRUPT, network(71)
+          errName = "NetworkInterruptError";
+          break;
+        default:
+          errName = "NetworkError";
+          break;
+      }
+    }
+
+    return [errType, errName];
+  },
+
+/**
+ * Returns if a uri/url is valid to subscribe.
+ *
+ * @param  nsIURI aUri or string aUrl  - the Uri/Url.
+ * @return boolean                     - true if a valid scheme, false if not.
+ */
+  _validSchemes: ["http", "https"],
+  isValidScheme: function(aUri) {
+    if (!(aUri instanceof Ci.nsIURI)) {
+      try {
+        aUri = Services.io.newURI(aUri, null, null);
+      }
+      catch (ex) {
+        return false;
+      }
+    }
+
+    return (this._validSchemes.indexOf(aUri.scheme) != -1);
+  },
+
+/**
+ * Is a folder Trash or in Trash.
+ *
+ * @param  nsIMsgFolder aFolder   - the folder.
+ * @return boolean                - true if folder is Trash else false.
+ */
+  isInTrash: function(aFolder) {
+    let trashFolder =
+        aFolder.rootFolder.getFolderWithFlags(Ci.nsMsgFolderFlags.Trash);
+    if (trashFolder &&
+        (trashFolder == aFolder || trashFolder.isAncestorOf(aFolder)))
+      return true;
+    return false;
+  },
+
+/**
+ * Return a folder path string constructed from individual folder UTF8 names
+ * stored as properties (not possible hashes used to construct disk foldername).
+ *
+ * @param  nsIMsgFolder aFolder     - the folder.
+ * @return string prettyName | null - name or null if not a disk folder.
+ */
+  getFolderPrettyPath: function(aFolder) {
+    let msgFolder = MailUtils.getFolderForURI(aFolder.URI, true);
+    if (!msgFolder)
+      // Not a real folder uri.
+      return null;
+
+    if (msgFolder.URI == msgFolder.server.serverURI)
+      return msgFolder.server.prettyName;
+
+    // Server part first.
+    let pathParts = [msgFolder.server.prettyName];
+    let rawPathParts = msgFolder.URI.split(msgFolder.server.serverURI + "/");
+    let folderURI = msgFolder.server.serverURI;
+    rawPathParts = rawPathParts[1].split("/");
+    for (let i = 0; i < rawPathParts.length - 1; i++)
+    {
+      // Two or more folders deep parts here.
+      folderURI += "/" + rawPathParts[i];
+      msgFolder = MailUtils.getFolderForURI(folderURI, true);
+      pathParts.push(msgFolder.name);
+    }
+
+    // Leaf folder last.
+    pathParts.push(aFolder.name);
+    return pathParts.join("/");
+  },
+
+/**
+ * Date validator for feeds.
+ *
+ * @param  string aDate - date string
+ * @return boolean      - true if passes regex test, false if not
+ */
+  isValidRFC822Date: function(aDate)
+  {
+    const FZ_RFC822_RE = "^(((Mon)|(Tue)|(Wed)|(Thu)|(Fri)|(Sat)|(Sun)), *)?\\d\\d?" +
+    " +((Jan)|(Feb)|(Mar)|(Apr)|(May)|(Jun)|(Jul)|(Aug)|(Sep)|(Oct)|(Nov)|(Dec))" +
+    " +\\d\\d(\\d\\d)? +\\d\\d:\\d\\d(:\\d\\d)? +(([+-]?\\d\\d\\d\\d)|(UT)|(GMT)" +
+    "|(EST)|(EDT)|(CST)|(CDT)|(MST)|(MDT)|(PST)|(PDT)|\\w)$";
+    let regex = new RegExp(FZ_RFC822_RE);
+    return regex.test(aDate);
+  },
+
+/**
+ * Create rfc5322 date.
+ *
+ * @param  [string] aDateString - optional date string; if null or invalid
+ *                                 date, get the current datetime.
+ * @return string               - an rfc5322 date string
+ */
+  getValidRFC5322Date: function(aDateString)
+  {
+    let d = new Date(aDateString || new Date().getTime());
+    d = isNaN(d.getTime()) ? new Date() : d;
+    return jsmime.headeremitter.emitStructuredHeader("Date", d, {}).substring(6).trim();
+  },
+
+  // Progress glue code.  Acts as a go between the RSS back end and the mail
+  // window front end determined by the aMsgWindow parameter passed into
+  // nsINewsBlogFeedDownloader.
+  progressNotifier: {
+    mSubscribeMode: false,
+    mMsgWindow: null,
+    mStatusFeedback: null,
+    mFeeds: {},
+    // Keeps track of the total number of feeds we have been asked to download.
+    // This number may not reflect the # of entries in our mFeeds array because
+    // not all feeds may have reported in for the first time.
+    mNumPendingFeedDownloads: 0,
+
+    init: function(aMsgWindow, aSubscribeMode)
+    {
+      if (!this.mNumPendingFeedDownloads)
+      {
+        // If we aren't already in the middle of downloading feed items.
+        this.mStatusFeedback = aMsgWindow ? aMsgWindow.statusFeedback : null;
+        this.mSubscribeMode = aSubscribeMode;
+        this.mMsgWindow = aMsgWindow;
+
+        if (this.mStatusFeedback)
+        {
+          this.mStatusFeedback.startMeteors();
+          this.mStatusFeedback.showStatusString(
+            FeedUtils.strings.GetStringFromName(
+              aSubscribeMode ? "subscribe-validating-feed" :
+                               "newsblog-getNewMsgsCheck"));
+        }
+      }
+    },
+
+    downloaded: function(feed, aErrorCode)
+    {
+      let location = feed.folder ? feed.folder.filePath.path : "";
+      FeedUtils.log.debug("downloaded: "+
+                          (this.mSubscribeMode ? "Subscribe " : "Update ") +
+                          "errorCode:feedName:folder - " +
+                          aErrorCode + " : " + feed.name + " : " + location);
+      if (this.mSubscribeMode)
+      {
+        if (aErrorCode == FeedUtils.kNewsBlogSuccess)
+        {
+          // Add the feed to the databases.
+          FeedUtils.addFeed(feed);
+
+          // Nice touch: select the folder that now contains the newly subscribed
+          // feed.  This is particularly nice if we just finished subscribing
+          // to a feed URL that the operating system gave us.
+          this.mMsgWindow.windowCommands.selectFolder(feed.folder.URI);
+
+          // Check for an existing feed subscriptions window and update it.
+          let subscriptionsWindow =
+              Services.wm.getMostRecentWindow("Mail:News-BlogSubscriptions");
+          if (subscriptionsWindow)
+            subscriptionsWindow.FeedSubscriptions.
+                                FolderListener.folderAdded(feed.folder);
+        }
+        else
+        {
+          // Non success.  Remove intermediate traces from the feeds database.
+          if (feed && feed.url && feed.server)
+            FeedUtils.deleteFeed(FeedUtils.rdf.GetResource(feed.url),
+                                 feed.server,
+                                 feed.server.rootFolder);
+        }
+      }
+
+      if (feed.folder && aErrorCode != FeedUtils.kNewsBlogFeedIsBusy)
+        // Free msgDatabase after new mail biff is set; if busy let the next
+        // result do the freeing.  Otherwise new messages won't be indicated.
+        feed.folder.msgDatabase = null;
+
+      let message = "";
+      if (feed.folder)
+        location = FeedUtils.getFolderPrettyPath(feed.folder) + " -> ";
+      switch (aErrorCode) {
+        case FeedUtils.kNewsBlogSuccess:
+        case FeedUtils.kNewsBlogFeedIsBusy:
+          message = "";
+          break;
+        case FeedUtils.kNewsBlogNoNewItems:
+          message = feed.url+". " +
+                    FeedUtils.strings.GetStringFromName(
+                      "newsblog-noNewArticlesForFeed");
+          break;
+        case FeedUtils.kNewsBlogInvalidFeed:
+          message = FeedUtils.strings.formatStringFromName(
+                      "newsblog-feedNotValid", [feed.url], 1);
+          break;
+        case FeedUtils.kNewsBlogRequestFailure:
+          message = FeedUtils.strings.formatStringFromName(
+                      "newsblog-networkError", [feed.url], 1);
+          break;
+        case FeedUtils.kNewsBlogFileError:
+          message = FeedUtils.strings.GetStringFromName(
+                      "subscribe-errorOpeningFile");
+          break;
+        case FeedUtils.kNewsBlogBadCertError:
+          let host = Services.io.newURI(feed.url, null, null).host;
+          message = FeedUtils.strings.formatStringFromName(
+                      "newsblog-badCertError", [host], 1);
+          break;
+        case FeedUtils.kNewsBlogNoAuthError:
+          message = FeedUtils.strings.formatStringFromName(
+                      "newsblog-noAuthError", [feed.url], 1);
+          break;
+      }
+      if (message)
+        FeedUtils.log.info("downloaded: " +
+                           (this.mSubscribeMode ? "Subscribe: " : "Update: ") +
+                           location + message);
+
+      if (this.mStatusFeedback)
+      {
+        this.mStatusFeedback.showStatusString(message);
+        this.mStatusFeedback.stopMeteors();
+      }
+
+      if (!--this.mNumPendingFeedDownloads)
+      {
+        FeedUtils.getSubscriptionsDS(feed.server).Flush();
+        this.mFeeds = {};
+        this.mSubscribeMode = false;
+        FeedUtils.log.debug("downloaded: all pending downloads finished");
+
+        // Should we do this on a timer so the text sticks around for a little
+        // while?  It doesnt look like we do it on a timer for newsgroups so
+        // we'll follow that model.  Don't clear the status text if we just
+        // dumped an error to the status bar!
+        if (aErrorCode == FeedUtils.kNewsBlogSuccess && this.mStatusFeedback)
+          this.mStatusFeedback.showStatusString("");
+      }
+
+      feed = null;
+    },
+
+    // This gets called after the RSS parser finishes storing a feed item to
+    // disk. aCurrentFeedItems is an integer corresponding to how many feed
+    // items have been downloaded so far.  aMaxFeedItems is an integer
+    // corresponding to the total number of feed items to download
+    onFeedItemStored: function (feed, aCurrentFeedItems, aMaxFeedItems)
+    {
+      // We currently don't do anything here.  Eventually we may add status
+      // text about the number of new feed articles received.
+
+      if (this.mSubscribeMode && this.mStatusFeedback)
+      {
+        // If we are subscribing to a feed, show feed download progress.
+        this.mStatusFeedback.showStatusString(
+          FeedUtils.strings.formatStringFromName("subscribe-gettingFeedItems",
+                                                 [aCurrentFeedItems, aMaxFeedItems], 2));
+        this.onProgress(feed, aCurrentFeedItems, aMaxFeedItems);
+      }
+    },
+
+    onProgress: function(feed, aProgress, aProgressMax, aLengthComputable)
+    {
+      if (feed.url in this.mFeeds)
+        // Have we already seen this feed?
+        this.mFeeds[feed.url].currentProgress = aProgress;
+      else
+        this.mFeeds[feed.url] = {currentProgress: aProgress,
+                                 maxProgress: aProgressMax};
+
+      this.updateProgressBar();
+    },
+
+    updateProgressBar: function()
+    {
+      let currentProgress = 0;
+      let maxProgress = 0;
+      for (let index in this.mFeeds)
+      {
+        currentProgress += this.mFeeds[index].currentProgress;
+        maxProgress += this.mFeeds[index].maxProgress;
+      }
+
+      // If we start seeing weird "jumping" behavior where the progress bar
+      // goes below a threshold then above it again, then we can factor a
+      // fudge factor here based on the number of feeds that have not reported
+      // yet and the avg progress we've already received for existing feeds.
+      // Fortunately the progressmeter is on a timer and only updates every so
+      // often.  For the most part all of our request have initial progress
+      // before the UI actually picks up a progress value.
+      if (this.mStatusFeedback)
+      {
+        let progress = (currentProgress * 100) / maxProgress;
+        this.mStatusFeedback.showProgress(progress);
+      }
+    }
+  }
+};
+
+XPCOMUtils.defineLazyGetter(FeedUtils, "log", function() {
+  return Log4Moz.getConfiguredLogger("Feeds");
+});
+
+XPCOMUtils.defineLazyGetter(FeedUtils, "strings", function() {
+  return Services.strings.createBundle(
+    "chrome://messenger-newsblog/locale/newsblog.properties");
+});
+
+XPCOMUtils.defineLazyGetter(FeedUtils, "rdf", function() {
+  return Cc["@mozilla.org/rdf/rdf-service;1"].
+         getService(Ci.nsIRDFService);
+});
+
+XPCOMUtils.defineLazyGetter(FeedUtils, "rdfContainerUtils", function() {
+  return Cc["@mozilla.org/rdf/container-utils;1"].
+         getService(Ci.nsIRDFContainerUtils);
+});
diff --git a/mailnews/extensions/newsblog/content/am-newsblog.js b/mailnews/extensions/newsblog/content/am-newsblog.js
new file mode 100644
index 000000000..674280f81
--- /dev/null
+++ b/mailnews/extensions/newsblog/content/am-newsblog.js
@@ -0,0 +1,63 @@
+/* -*- Mode: JavaScript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+Components.utils.import("resource:///modules/FeedUtils.jsm");
+
+var gServer, autotagEnable, autotagUsePrefix, autotagPrefix;
+
+function onInit(aPageId, aServerId)
+{
+  var accountName = document.getElementById("server.prettyName");
+  var title = document.getElementById("am-newsblog-title");
+  var defaultTitle = title.getAttribute("defaultTitle");
+
+  var titleValue;
+  if (accountName.value)
+    titleValue = defaultTitle + " - <" + accountName.value + ">";
+  else
+    titleValue = defaultTitle;
+
+  title.setAttribute("title", titleValue);
+  document.title = titleValue;
+
+  onCheckItem("server.biffMinutes", ["server.doBiff"]);
+
+  autotagEnable = document.getElementById("autotagEnable");
+  autotagUsePrefix = document.getElementById("autotagUsePrefix");
+  autotagPrefix = document.getElementById("autotagPrefix");
+
+  let categoryPrefsAcct = FeedUtils.getOptionsAcct(gServer).category;
+  autotagEnable.checked = categoryPrefsAcct.enabled;
+  autotagUsePrefix.disabled = !autotagEnable.checked;
+  autotagUsePrefix.checked = categoryPrefsAcct.prefixEnabled;
+  autotagPrefix.disabled = autotagUsePrefix.disabled || !autotagUsePrefix.checked;
+  autotagPrefix.value = categoryPrefsAcct.prefix;
+}
+
+function onPreInit(account, accountValues)
+{
+  gServer = account.incomingServer;
+}
+
+function setCategoryPrefs(aNode)
+{
+  let options =  FeedUtils.getOptionsAcct(gServer);
+  switch (aNode.id) {
+    case "autotagEnable":
+      options.category.enabled = aNode.checked;
+      autotagUsePrefix.disabled = !aNode.checked;
+      autotagPrefix.disabled = !aNode.checked || !autotagUsePrefix.checked;
+      break;
+    case "autotagUsePrefix":
+      options.category.prefixEnabled = aNode.checked;
+      autotagPrefix.disabled = aNode.disabled || !aNode.checked;
+      break;
+    case "autotagPrefix":
+      options.category.prefix = aNode.value;
+      break;
+  }
+
+  FeedUtils.setOptionsAcct(gServer, options)
+}
diff --git a/mailnews/extensions/newsblog/content/am-newsblog.xul b/mailnews/extensions/newsblog/content/am-newsblog.xul
new file mode 100644
index 000000000..19173d803
--- /dev/null
+++ b/mailnews/extensions/newsblog/content/am-newsblog.xul
@@ -0,0 +1,155 @@
+<?xml version="1.0"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<?xml-stylesheet href="chrome://messenger/skin/accountManage.css" type="text/css"?>
+<?xml-stylesheet href="chrome://messenger-newsblog/skin/feed-subscriptions.css" type="text/css"?>
+
+<!DOCTYPE page [
+<!ENTITY %         newsblogDTD SYSTEM "chrome://messenger-newsblog/locale/am-newsblog.dtd" >
+%newsblogDTD;
+<!ENTITY %             feedDTD SYSTEM "chrome://messenger-newsblog/locale/feed-subscriptions.dtd" >
+%feedDTD;
+<!ENTITY %   accountNoIdentDTD SYSTEM "chrome://messenger/locale/am-serverwithnoidentities.dtd" >
+%accountNoIdentDTD;
+<!ENTITY % accountServerTopDTD SYSTEM "chrome://messenger/locale/am-server-top.dtd">
+%accountServerTopDTD;
+]>
+
+<page xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+      class="color-dialog"
+      title="&accountTitle.label;"
+      onload="parent.onPanelLoaded('am-newsblog.xul');">
+
+  <script type="application/javascript"
+          src="chrome://messenger/content/AccountManager.js"/>
+  <script type="application/javascript"
+          src="chrome://messenger-newsblog/content/am-newsblog.js"/>
+  <script type="application/javascript"
+          src="chrome://messenger-newsblog/content/newsblogOverlay.js"/>
+  <script type="application/javascript"
+          src="chrome://messenger/content/amUtils.js"/>
+  <script type="application/javascript"
+          src="chrome://messenger/content/am-prefs.js"/>
+
+  <vbox flex="1" style="overflow: auto;">
+
+    <dialogheader id="am-newsblog-title" defaultTitle="&accountTitle.label;"/>
+
+    <description class="secDesc">&accountSettingsDesc.label;</description>
+
+    <hbox align="center">
+      <label value="&accountName.label;"
+             accesskey="&accountName.accesskey;"
+             control="server.prettyName"/>
+      <textbox id="server.prettyName"
+               wsm_persist="true"
+               size="30"
+               prefstring="mail.server.%serverkey%.name"/>
+    </hbox>
+
+    <separator class="thin"/>
+
+    <groupbox>
+      <caption label="&serverSettings.label;"/>
+
+      <checkbox id="server.loginAtStartUp"
+                wsm_persist="true"
+                label="&loginAtStartup.label;"
+                accesskey="&loginAtStartup.accesskey;"
+                prefattribute="value"
+                prefstring="mail.server.%serverkey%.login_at_startup"/>
+
+      <hbox align="center">
+        <checkbox id="server.doBiff"
+                  wsm_persist="true"
+                  label="&biffStart.label;"
+                  accesskey="&biffStart.accesskey;"
+                  oncommand="onCheckItem('server.biffMinutes', [this.id]);"
+                  prefattribute="value"
+                  prefstring="mail.server.%serverkey%.check_new_mail"/>
+        <textbox id="server.biffMinutes"
+                 wsm_persist="true"
+                 type="number"
+                 size="3"
+                 min="1"
+                 increment="1"
+                 preftype="int"
+                 prefstring="mail.server.%serverkey%.check_time"
+                 aria-labelledby="server.doBiff server.biffMinutes biffEnd"/>
+        <label id="biffEnd"
+             value="&biffEnd.label;"
+             control="server.biffMinutes"/>
+      </hbox>
+
+      <checkbox id="server.quickMode"
+                wsm_persist="true"
+                genericattr="true"
+                label="&useQuickMode.label;"
+                accesskey="&useQuickMode.accesskey;"
+                preftype="bool"
+                prefattribute="value"
+                prefstring="mail.server.%serverkey%.quickMode"/>
+
+      <checkbox id="autotagEnable"
+                accesskey="&autotagEnable.accesskey;"
+                label="&autotagEnable.label;"
+                oncommand="setCategoryPrefs(this)"/>
+      <hbox>
+          <checkbox id="autotagUsePrefix"
+                    class="indent"
+                    accesskey="&autotagUsePrefix.accesskey;"
+                    label="&autotagUsePrefix.label;"
+                    oncommand="setCategoryPrefs(this)"/>
+          <textbox id="autotagPrefix"
+                   placeholder="&autoTagPrefix.placeholder;"
+                   clickSelectsAll="true"
+                   onchange="setCategoryPrefs(this)"/>
+      </hbox>
+    </groupbox>
+
+    <separator class="thin"/>
+
+    <groupbox>
+      <caption label="&messageStorage.label;"/>
+
+      <checkbox id="server.emptyTrashOnExit"
+                wsm_persist="true"
+                label="&emptyTrashOnExit.label;"
+                accesskey="&emptyTrashOnExit.accesskey;"
+                prefattribute="value"
+                prefstring="mail.server.%serverkey%.empty_trash_on_exit"/>
+
+      <separator class="thin"/>
+
+      <vbox>
+        <label value="&localPath.label;" control="server.localPath"/>
+        <hbox align="center">
+          <textbox readonly="true"
+                   wsm_persist="true"
+                   flex="1"
+                   id="server.localPath"
+                   datatype="nsIFile"
+                   prefstring="mail.server.%serverkey%.directory"
+                   class="uri-element"/>
+          <button id="browseForLocalFolder"
+                  label="&browseFolder.label;"
+                  filepickertitle="&localFolderPicker.label;"
+                  accesskey="&browseFolder.accesskey;"
+                  oncommand="BrowseForLocalFolders();"/>
+        </hbox>
+      </vbox>
+
+    </groupbox>
+
+    <separator class="thin"/>
+
+    <hbox align="center">
+      <spacer flex="1"/>
+      <button label="&manageSubscriptions.label;"
+              accesskey="&manageSubscriptions.accesskey;"
+              oncommand="openSubscriptionsDialog(gServer.rootFolder);"/>
+    </hbox>
+  </vbox>
+</page>
diff --git a/mailnews/extensions/newsblog/content/feed-parser.js b/mailnews/extensions/newsblog/content/feed-parser.js
new file mode 100644
index 000000000..660333422
--- /dev/null
+++ b/mailnews/extensions/newsblog/content/feed-parser.js
@@ -0,0 +1,1034 @@
+/* -*- Mode: JavaScript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// The feed parser depends on FeedItem.js, Feed.js.
+function FeedParser() {
+  this.mSerializer = Cc["@mozilla.org/xmlextras/xmlserializer;1"].
+                     createInstance(Ci.nsIDOMSerializer);
+}
+
+FeedParser.prototype =
+{
+  // parseFeed() returns an array of parsed items ready for processing.  It is
+  // currently a synchronous operation.  If there is an error parsing the feed,
+  // parseFeed returns an empty feed in addition to calling aFeed.onParseError.
+  parseFeed: function (aFeed, aDOM)
+  {
+    if (!(aDOM instanceof Ci.nsIDOMXMLDocument))
+    {
+      // No xml doc.
+      return aFeed.onParseError(aFeed);
+    }
+
+    let doc = aDOM.documentElement;
+    if (doc.namespaceURI == FeedUtils.MOZ_PARSERERROR_NS)
+    {
+      // Gecko caught a basic parsing error.
+      let errStr = doc.firstChild.textContent + "\n" +
+                   doc.firstElementChild.textContent;
+      FeedUtils.log.info("FeedParser.parseFeed: - " + errStr);
+      return aFeed.onParseError(aFeed);
+    }
+    else if (aDOM.querySelector("redirect"))
+    {
+      // Check for RSS2.0 redirect document.
+      let channel = aDOM.querySelector("redirect");
+      if (this.isPermanentRedirect(aFeed, channel, null, null))
+        return;
+
+      return aFeed.onParseError(aFeed);
+    }
+    else if (doc.namespaceURI == FeedUtils.RDF_SYNTAX_NS &&
+             doc.getElementsByTagNameNS(FeedUtils.RSS_NS, "channel")[0])
+    {
+      aFeed.mFeedType = "RSS_1.xRDF"
+      FeedUtils.log.debug("FeedParser.parseFeed: type:url - " +
+                          aFeed.mFeedType +" : " +aFeed.url);
+      // aSource can be misencoded (XMLHttpRequest converts to UTF-8 by default),
+      // but the DOM is almost always right because it uses the hints in the
+      // XML file.  This is slower, but not noticably so.  Mozilla doesn't have
+      // the XMLHttpRequest.responseBody property that IE has, which provides
+      // access to the unencoded response.
+      let xmlString = this.mSerializer.serializeToString(doc);
+      return this.parseAsRSS1(aFeed, xmlString, aFeed.request.channel.URI);
+    }
+    else if (doc.namespaceURI == FeedUtils.ATOM_03_NS)
+    {
+      aFeed.mFeedType = "ATOM_0.3"
+      FeedUtils.log.debug("FeedParser.parseFeed: type:url - " +
+                          aFeed.mFeedType +" : " +aFeed.url);
+      return this.parseAsAtom(aFeed, aDOM);
+    }
+    else if (doc.namespaceURI == FeedUtils.ATOM_IETF_NS)
+    {
+      aFeed.mFeedType = "ATOM_IETF"
+      FeedUtils.log.debug("FeedParser.parseFeed: type:url - " +
+                          aFeed.mFeedType +" : " +aFeed.url);
+      return this.parseAsAtomIETF(aFeed, aDOM);
+    }
+    else if (doc.getElementsByTagNameNS(FeedUtils.RSS_090_NS, "channel")[0])
+    {
+      aFeed.mFeedType = "RSS_0.90"
+      FeedUtils.log.debug("FeedParser.parseFeed: type:url - " +
+                          aFeed.mFeedType +" : " +aFeed.url);
+      return this.parseAsRSS2(aFeed, aDOM);
+    }
+    else
+    {
+      // Parse as RSS 0.9x.  In theory even RSS 1.0 feeds could be parsed by
+      // the 0.9x parser if the RSS namespace were the default.
+      let rssVer = doc.localName == "rss" ? doc.getAttribute("version") : null;
+      if (rssVer)
+        aFeed.mFeedType = "RSS_" + rssVer;
+      else
+        aFeed.mFeedType = "RSS_0.9x?";
+      FeedUtils.log.debug("FeedParser.parseFeed: type:url - " +
+                          aFeed.mFeedType +" : " +aFeed.url);
+      return this.parseAsRSS2(aFeed, aDOM);
+    }
+  },
+
+  parseAsRSS2: function (aFeed, aDOM)
+  {
+    // Get the first channel (assuming there is only one per RSS File).
+    let parsedItems = new Array();
+
+    let channel = aDOM.querySelector("channel");
+    if (!channel)
+      return aFeed.onParseError(aFeed);
+
+    // Usually the empty string, unless this is RSS .90.
+    let nsURI = channel.namespaceURI || "";
+    FeedUtils.log.debug("FeedParser.parseAsRSS2: channel nsURI - " + nsURI);
+
+    if (this.isPermanentRedirect(aFeed, null, channel, null))
+      return;
+
+    let tags = this.childrenByTagNameNS(channel, nsURI, "title");
+    aFeed.title = aFeed.title || this.getNodeValue(tags ? tags[0] : null);
+    tags = this.childrenByTagNameNS(channel, nsURI, "description");
+    aFeed.description = this.getNodeValueFormatted(tags ? tags[0] : null);
+    tags = this.childrenByTagNameNS(channel, nsURI, "link");
+    aFeed.link = this.validLink(this.getNodeValue(tags ? tags[0] : null));
+
+    if (!(aFeed.title || aFeed.description) || !aFeed.link)
+    {
+      FeedUtils.log.error("FeedParser.parseAsRSS2: missing mandatory element " +
+                          "<title> and <description>, or <link>");
+      return aFeed.onParseError(aFeed);
+    }
+
+    if (!aFeed.parseItems)
+      return parsedItems;
+
+    aFeed.invalidateItems();
+    // XXX use getElementsByTagNameNS for now; childrenByTagNameNS would be
+    // better, but RSS .90 is still with us.
+    let itemNodes = aDOM.getElementsByTagNameNS(nsURI, "item");
+    itemNodes = itemNodes ? itemNodes : [];
+    FeedUtils.log.debug("FeedParser.parseAsRSS2: items to parse - " +
+                        itemNodes.length);
+
+    for (let itemNode of itemNodes)
+    {
+      if (!itemNode.childElementCount)
+        continue;
+      let item = new FeedItem();
+      item.feed = aFeed;
+      item.enclosures = [];
+      item.keywords = [];
+
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.FEEDBURNER_NS, "origLink");
+      let link = this.validLink(this.getNodeValue(tags ? tags[0] : null));
+      if (!link)
+      {
+        tags = this.childrenByTagNameNS(itemNode, nsURI, "link");
+        link = this.validLink(this.getNodeValue(tags ? tags[0] : null));
+      }
+      tags = this.childrenByTagNameNS(itemNode, nsURI, "guid");
+      let guidNode = tags ? tags[0] : null;
+
+      let guid;
+      let isPermaLink = false;
+      if (guidNode)
+      {
+        guid = this.getNodeValue(guidNode);
+        // isPermaLink is true if the value is "true" or if the attribute is
+        // not present; all other values, including "false" and "False" and
+        // for that matter "TRuE" and "meatcake" are false.
+        if (!guidNode.hasAttribute("isPermaLink") ||
+            guidNode.getAttribute("isPermaLink") == "true")
+          isPermaLink = true;
+        // If attribute isPermaLink is missing, it is good to check the validity
+        // of <guid> value as an URL to avoid linking to non-URL strings.
+        if (!guidNode.hasAttribute("isPermaLink"))
+        {
+          try
+          {
+            Services.io.newURI(guid, null, null);
+            if (Services.io.extractScheme(guid) == "tag")
+              isPermaLink = false;
+          }
+          catch (ex)
+          {
+            isPermaLink = false;
+          }
+        }
+
+        item.id = guid;
+      }
+
+      let guidLink = this.validLink(guid);
+      item.url = isPermaLink && guidLink ? guidLink : link ? link : null;
+      tags = this.childrenByTagNameNS(itemNode, nsURI, "description");
+      item.description = this.getNodeValueFormatted(tags ? tags[0] : null);
+      tags = this.childrenByTagNameNS(itemNode, nsURI, "title");
+      item.title = this.getNodeValue(tags ? tags[0] : null);
+      if (!(item.title || item.description))
+      {
+        FeedUtils.log.info("FeedParser.parseAsRSS2: <item> missing mandatory " +
+                           "element, either <title> or <description>; skipping");
+        continue;
+      }
+
+      if (!item.id)
+      {
+        // At this point, if there is no guid, uniqueness cannot be guaranteed
+        // by any of link or date (optional) or title (optional unless there
+        // is no description). Use a big chunk of description; minimize dupes
+        // with url and title if present.
+        item.id = (item.url || item.feed.url) + "#" + item.title + "#" +
+                  (this.stripTags(item.description ?
+                                    item.description.substr(0, 150) : null) ||
+                   item.title);
+        item.id = item.id.replace(/[\n\r\t\s]+/g, " ");
+      }
+
+      // Escape html entities in <title>, which are unescaped as textContent
+      // values. If the title is used as content, it will remain escaped; if
+      // it is used as the title, it will be unescaped upon store. Bug 1240603.
+      // The <description> tag must follow escaping examples found in
+      // http://www.rssboard.org/rss-encoding-examples, i.e. single escape angle
+      // brackets for tags, which are removed if used as title, and double
+      // escape entities for presentation in title.
+      // Better: always use <title>. Best: use Atom.
+      if (!item.title)
+        item.title = this.stripTags(item.description).substr(0, 150);
+      else
+        item.title = item.htmlEscape(item.title);
+
+      tags = this.childrenByTagNameNS(itemNode, nsURI, "author");
+      if (!tags)
+        tags = this.childrenByTagNameNS(itemNode, FeedUtils.DC_NS, "creator");
+      item.author = this.getNodeValue(tags ? tags[0] : null) ||
+                    aFeed.title ||
+                    item.author;
+
+      tags = this.childrenByTagNameNS(itemNode, nsURI, "pubDate");
+      if (!tags || !this.getNodeValue(tags[0]))
+        tags = this.childrenByTagNameNS(itemNode, FeedUtils.DC_NS, "date");
+      item.date = this.getNodeValue(tags ? tags[0] : null) || item.date;
+
+      // If the date is invalid, users will see the beginning of the epoch
+      // unless we reset it here, so they'll see the current time instead.
+      // This is typical aggregator behavior.
+      if (item.date)
+      {
+        item.date = item.date.trim();
+        if (!FeedUtils.isValidRFC822Date(item.date))
+        {
+          // XXX Use this on the other formats as well.
+          item.date = this.dateRescue(item.date);
+        }
+      }
+
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.RSS_CONTENT_NS, "encoded");
+      item.content = this.getNodeValueFormatted(tags ? tags[0] : null);
+
+      // Handle <enclosures> and <media:content>, which may be in a
+      // <media:group> (if present).
+      tags = this.childrenByTagNameNS(itemNode, nsURI, "enclosure");
+      let encUrls = [];
+      if (tags)
+        for (let tag of tags)
+        {
+          let url = this.validLink(tag.getAttribute("url"));
+          if (url && encUrls.indexOf(url) == -1)
+          {
+            let type = this.removeUnprintableASCII(tag.getAttribute("type"));
+            let length = this.removeUnprintableASCII(tag.getAttribute("length"));
+            item.enclosures.push(new FeedEnclosure(url, type, length));
+            encUrls.push(url);
+          }
+        }
+
+      tags = itemNode.getElementsByTagNameNS(FeedUtils.MRSS_NS, "content");
+      if (tags)
+        for (let tag of tags)
+        {
+          let url = this.validLink(tag.getAttribute("url"));
+          if (url && encUrls.indexOf(url) == -1)
+          {
+            let type = this.removeUnprintableASCII(tag.getAttribute("type"));
+            let fileSize = this.removeUnprintableASCII(tag.getAttribute("fileSize"));
+            item.enclosures.push(new FeedEnclosure(url, type, fileSize));
+          }
+        }
+
+      // The <origEnclosureLink> tag has no specification, especially regarding
+      // whether more than one tag is allowed and, if so, how tags would
+      // relate to previously declared (and well specified) enclosure urls.
+      // The common usage is to include 1 origEnclosureLink, in addition to
+      // the specified enclosure tags for 1 enclosure. Thus, we will replace the
+      // first enclosure's, if found, url with the first <origEnclosureLink>
+      // url only or else add the <origEnclosureLink> url.
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.FEEDBURNER_NS, "origEnclosureLink");
+      let origEncUrl = this.validLink(this.getNodeValue(tags ? tags[0] : null));
+      if (origEncUrl)
+      {
+        if (item.enclosures.length)
+          item.enclosures[0].mURL = origEncUrl;
+        else
+          item.enclosures.push(new FeedEnclosure(origEncUrl));
+      }
+
+      // Support <category> and autotagging.
+      tags = this.childrenByTagNameNS(itemNode, nsURI, "category");
+      if (tags)
+      {
+        for (let tag of tags)
+        {
+          let term = this.getNodeValue(tag);
+          term = term ? this.xmlUnescape(term.replace(/,/g, ";")) : null;
+          if (term && item.keywords.indexOf(term) == -1)
+            item.keywords.push(term);
+        }
+      }
+
+      parsedItems.push(item);
+    }
+
+    return parsedItems;
+  },
+
+  parseAsRSS1 : function(aFeed, aSource, aBaseURI)
+  {
+    let parsedItems = new Array();
+
+    // RSS 1.0 is valid RDF, so use the RDF parser/service to extract data.
+    // Create a new RDF data source and parse the feed into it.
+    let ds = Cc["@mozilla.org/rdf/datasource;1?name=in-memory-datasource"].
+             createInstance(Ci.nsIRDFDataSource);
+
+    let rdfparser = Cc["@mozilla.org/rdf/xml-parser;1"].
+                    createInstance(Ci.nsIRDFXMLParser);
+    rdfparser.parseString(ds, aBaseURI, aSource);
+
+    // Get information about the feed as a whole.
+    let channel = ds.GetSource(FeedUtils.RDF_TYPE, FeedUtils.RSS_CHANNEL, true);
+    if (!channel)
+      return aFeed.onParseError(aFeed);
+
+    if (this.isPermanentRedirect(aFeed, null, channel, ds))
+      return;
+
+    aFeed.title = aFeed.title ||
+                  this.getRDFTargetValue(ds, channel, FeedUtils.RSS_TITLE) ||
+                  aFeed.url;
+    aFeed.description = this.getRDFTargetValueFormatted(ds, channel, FeedUtils.RSS_DESCRIPTION) ||
+                        "";
+    aFeed.link = this.validLink(this.getRDFTargetValue(ds, channel, FeedUtils.RSS_LINK)) ||
+                 aFeed.url;
+
+    if (!(aFeed.title || aFeed.description) || !aFeed.link)
+    {
+      FeedUtils.log.error("FeedParser.parseAsRSS1: missing mandatory element " +
+                          "<title> and <description>, or <link>");
+      return aFeed.onParseError(aFeed);
+    }
+
+    if (!aFeed.parseItems)
+      return parsedItems;
+
+    aFeed.invalidateItems();
+
+    // Ignore the <items> list and just get the <item>s.
+    let items = ds.GetSources(FeedUtils.RDF_TYPE, FeedUtils.RSS_ITEM, true);
+
+    let index = 0;
+    while (items.hasMoreElements())
+    {
+      let itemResource = items.getNext().QueryInterface(Ci.nsIRDFResource);
+      let item = new FeedItem();
+      item.feed = aFeed;
+
+      // Prefer the value of the link tag to the item URI since the URI could be
+      // a relative URN.
+      let uri = itemResource.ValueUTF8;
+      let link = this.validLink(this.getRDFTargetValue(ds, itemResource, FeedUtils.RSS_LINK));
+      item.url = link || uri;
+      item.description = this.getRDFTargetValueFormatted(ds, itemResource,
+                                                         FeedUtils.RSS_DESCRIPTION);
+      item.title = this.getRDFTargetValue(ds, itemResource, FeedUtils.RSS_TITLE) ||
+                   this.getRDFTargetValue(ds, itemResource, FeedUtils.DC_SUBJECT) ||
+                   (item.description ?
+                     (this.stripTags(item.description).substr(0, 150)) : null);
+      if (!item.url || !item.title)
+      {
+        FeedUtils.log.info("FeedParser.parseAsRSS1: <item> missing mandatory " +
+                           "element <item rdf:about> and <link>, or <title> and " +
+                           "no <description>; skipping");
+        continue;
+      }
+
+      item.id = item.url;
+      item.url = this.validLink(item.url);
+
+      item.author = this.getRDFTargetValue(ds, itemResource, FeedUtils.DC_CREATOR) ||
+                    this.getRDFTargetValue(ds, channel, FeedUtils.DC_CREATOR) ||
+                    aFeed.title ||
+                    item.author;
+      item.date = this.getRDFTargetValue(ds, itemResource, FeedUtils.DC_DATE) ||
+                  item.date;
+      item.content = this.getRDFTargetValueFormatted(ds, itemResource,
+                                                     FeedUtils.RSS_CONTENT_ENCODED);
+
+      parsedItems[index++] = item;
+    }
+    FeedUtils.log.debug("FeedParser.parseAsRSS1: items parsed - " + index);
+
+    return parsedItems;
+  },
+
+  parseAsAtom: function(aFeed, aDOM)
+  {
+    let parsedItems = new Array();
+
+    // Get the first channel (assuming there is only one per Atom File).
+    let channel = aDOM.querySelector("feed");
+    if (!channel)
+      return aFeed.onParseError(aFeed);
+
+    if (this.isPermanentRedirect(aFeed, null, channel, null))
+      return;
+
+    let tags = this.childrenByTagNameNS(channel, FeedUtils.ATOM_03_NS, "title");
+    aFeed.title = aFeed.title ||
+                  this.stripTags(this.getNodeValue(tags ? tags[0] : null));
+    tags = this.childrenByTagNameNS(channel, FeedUtils.ATOM_03_NS, "tagline");
+    aFeed.description = this.getNodeValueFormatted(tags ? tags[0] : null);
+    tags = this.childrenByTagNameNS(channel, FeedUtils.ATOM_03_NS, "link");
+    aFeed.link = this.validLink(this.findAtomLink("alternate", tags));
+
+    if (!aFeed.title)
+    {
+      FeedUtils.log.error("FeedParser.parseAsAtom: missing mandatory element " +
+                          "<title>");
+      return aFeed.onParseError(aFeed);
+    }
+
+    if (!aFeed.parseItems)
+      return parsedItems;
+
+    aFeed.invalidateItems();
+    let items = this.childrenByTagNameNS(channel, FeedUtils.ATOM_03_NS, "entry");
+    items = items ? items : [];
+    FeedUtils.log.debug("FeedParser.parseAsAtom: items to parse - " +
+                        items.length);
+
+    for (let itemNode of items)
+    {
+      if (!itemNode.childElementCount)
+        continue;
+      let item = new FeedItem();
+      item.feed = aFeed;
+
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_03_NS, "link");
+      item.url = this.validLink(this.findAtomLink("alternate", tags));
+
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_03_NS, "id");
+      item.id = this.getNodeValue(tags ? tags[0] : null);
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_03_NS, "summary");
+      item.description = this.getNodeValueFormatted(tags ? tags[0] : null);
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_03_NS, "title");
+      item.title = this.getNodeValue(tags ? tags[0] : null) ||
+                   (item.description ? item.description.substr(0, 150) : null);
+      if (!item.title || !item.id)
+      {
+        // We're lenient about other mandatory tags, but insist on these.
+        FeedUtils.log.info("FeedParser.parseAsAtom: <entry> missing mandatory " +
+                           "element <id>, or <title> and no <summary>; skipping");
+        continue;
+      }
+
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_03_NS, "author");
+      if (!tags)
+        tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_03_NS, "contributor");
+      if (!tags)
+        tags = this.childrenByTagNameNS(channel, FeedUtils.ATOM_03_NS, "author");
+
+      let authorEl = tags ? tags[0] : null;
+
+      let author = "";
+      if (authorEl)
+      {
+        tags = this.childrenByTagNameNS(authorEl, FeedUtils.ATOM_03_NS, "name");
+        let name = this.getNodeValue(tags ? tags[0] : null);
+        tags = this.childrenByTagNameNS(authorEl, FeedUtils.ATOM_03_NS, "email");
+        let email = this.getNodeValue(tags ? tags[0] : null);
+        if (name)
+          author = name + (email ? " <" + email + ">" : "");
+        else if (email)
+          author = email;
+      }
+
+      item.author = author || item.author || aFeed.title;
+
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_03_NS, "modified");
+      if (!tags || !this.getNodeValue(tags[0]))
+        tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_03_NS, "issued");
+      if (!tags || !this.getNodeValue(tags[0]))
+        tags = this.childrenByTagNameNS(channel, FeedUtils.ATOM_03_NS, "created");
+
+      item.date = this.getNodeValue(tags ? tags[0] : null) || item.date;
+
+      // XXX We should get the xml:base attribute from the content tag as well
+      // and use it as the base HREF of the message.
+      // XXX Atom feeds can have multiple content elements; we should differentiate
+      // between them and pick the best one.
+      // Some Atom feeds wrap the content in a CTYPE declaration; others use
+      // a namespace to identify the tags as HTML; and a few are buggy and put
+      // HTML tags in without declaring their namespace so they look like Atom.
+      // We deal with the first two but not the third.
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_03_NS, "content");
+      let contentNode = tags ? tags[0] : null;
+
+      let content;
+      if (contentNode)
+      {
+        content = "";
+        for (let j = 0; j < contentNode.childNodes.length; j++)
+        {
+          let node = contentNode.childNodes.item(j);
+          if (node.nodeType == node.CDATA_SECTION_NODE)
+            content += node.data;
+          else
+            content += this.mSerializer.serializeToString(node);
+        }
+      
+        if (contentNode.getAttribute("mode") == "escaped")
+        {
+          content = content.replace(/&lt;/g, "<");
+          content = content.replace(/&gt;/g, ">");
+          content = content.replace(/&amp;/g, "&");
+        }
+
+        if (content == "")
+          content = null;
+      }
+
+      item.content = content;
+      parsedItems.push(item);
+    }
+
+    return parsedItems;
+  },
+
+  parseAsAtomIETF: function(aFeed, aDOM)
+  {
+    let parsedItems = new Array();
+
+    // Get the first channel (assuming there is only one per Atom File).
+    let channel = this.childrenByTagNameNS(aDOM, FeedUtils.ATOM_IETF_NS, "feed")[0];
+    if (!channel)
+      return aFeed.onParseError(aFeed);
+
+    if (this.isPermanentRedirect(aFeed, null, channel, null))
+      return;
+
+    let tags = this.childrenByTagNameNS(channel, FeedUtils.ATOM_IETF_NS, "title");
+    aFeed.title = aFeed.title ||
+                  this.stripTags(this.serializeTextConstruct(tags ? tags[0] : null));
+
+    tags = this.childrenByTagNameNS(channel, FeedUtils.ATOM_IETF_NS, "subtitle");
+    aFeed.description = this.serializeTextConstruct(tags ? tags[0] : null);
+
+    tags = this.childrenByTagNameNS(channel, FeedUtils.ATOM_IETF_NS, "link");
+    aFeed.link = this.findAtomLink("alternate", tags);
+    aFeed.link = this.validLink(aFeed.link);
+
+    if (!aFeed.title)
+    {
+      FeedUtils.log.error("FeedParser.parseAsAtomIETF: missing mandatory element " +
+                          "<title>");
+      return aFeed.onParseError(aFeed);
+    }
+
+    if (!aFeed.parseItems)
+      return parsedItems;
+
+    aFeed.invalidateItems();
+    let items = this.childrenByTagNameNS(channel, FeedUtils.ATOM_IETF_NS, "entry");
+    items = items ? items : [];
+    FeedUtils.log.debug("FeedParser.parseAsAtomIETF: items to parse - " +
+                        items.length);
+
+    for (let itemNode of items)
+    {
+      if (!itemNode.childElementCount)
+        continue;
+      let item = new FeedItem();
+      item.feed = aFeed;
+      item.enclosures = [];
+      item.keywords = [];
+
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.FEEDBURNER_NS, "origLink");
+      item.url = this.validLink(this.getNodeValue(tags ? tags[0] : null));
+      if (!item.url)
+      {
+        tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_IETF_NS, "link");
+        item.url = this.validLink(this.findAtomLink("alternate", tags)) ||
+                   aFeed.link;
+      }
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_IETF_NS, "id");
+      item.id = this.getNodeValue(tags ? tags[0] : null);
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_IETF_NS, "summary");
+      item.description = this.serializeTextConstruct(tags ? tags[0] : null);
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_IETF_NS, "title");
+      item.title = this.stripTags(this.serializeTextConstruct(tags ? tags[0] : null) ||
+                                  (item.description ?
+                                     item.description.substr(0, 150) : null));
+      if (!item.title || !item.id)
+      {
+        // We're lenient about other mandatory tags, but insist on these.
+        FeedUtils.log.info("FeedParser.parseAsAtomIETF: <entry> missing mandatory " +
+                           "element <id>, or <title> and no <summary>; skipping");
+        continue;
+      }
+
+      // XXX Support multiple authors.
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_IETF_NS, "source");
+      let source = tags ? tags[0] : null;
+
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_IETF_NS, "author");
+      if (!tags)
+        tags = this.childrenByTagNameNS(source, FeedUtils.ATOM_IETF_NS, "author");
+      if (!tags)
+        tags = this.childrenByTagNameNS(channel, FeedUtils.ATOM_IETF_NS, "author");
+
+      let authorEl = tags ? tags[0] : null;
+
+      let author = "";
+      if (authorEl)
+      {
+        tags = this.childrenByTagNameNS(authorEl, FeedUtils.ATOM_IETF_NS, "name");
+        let name = this.getNodeValue(tags ? tags[0] : null);
+        tags = this.childrenByTagNameNS(authorEl, FeedUtils.ATOM_IETF_NS, "email");
+        let email = this.getNodeValue(tags ? tags[0] : null);
+        if (name)
+          author = name + (email ? " <" + email + ">" : "");
+        else if (email)
+          author = email;
+      }
+
+      item.author = author || item.author || aFeed.title;
+
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_IETF_NS, "updated");
+      if (!tags || !this.getNodeValue(tags[0]))
+        tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_IETF_NS, "published");
+      if (!tags || !this.getNodeValue(tags[0]))
+        tags = this.childrenByTagNameNS(source, FeedUtils.ATOM_IETF_NS, "published");
+      item.date = this.getNodeValue(tags ? tags[0] : null) || item.date;
+
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_IETF_NS, "content");
+      item.content = this.serializeTextConstruct(tags ? tags[0] : null);
+
+      if (item.content)
+        item.xmlContentBase = tags ? tags[0].baseURI : null;
+      else if (item.description)
+      {
+        tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_IETF_NS, "summary");
+        item.xmlContentBase = tags ? tags[0].baseURI : null;
+      }
+      else
+        item.xmlContentBase = itemNode.baseURI;
+
+      item.xmlContentBase = this.validLink(item.xmlContentBase);
+
+      // Handle <link rel="enclosure"> (if present).
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_IETF_NS, "link");
+      let encUrls = [];
+      if (tags)
+        for (let tag of tags)
+        {
+          let url = tag.getAttribute("rel") == "enclosure" ?
+                      (tag.getAttribute("href") || "").trim() : null;
+          url = this.validLink(url);
+          if (url && encUrls.indexOf(url) == -1)
+          {
+            let type = this.removeUnprintableASCII(tag.getAttribute("type"));
+            let length = this.removeUnprintableASCII(tag.getAttribute("length"));
+            let title = this.removeUnprintableASCII(tag.getAttribute("title"));
+            item.enclosures.push(new FeedEnclosure(url, type, length, title));
+            encUrls.push(url);
+          }
+        }
+
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.FEEDBURNER_NS, "origEnclosureLink");
+      let origEncUrl = this.validLink(this.getNodeValue(tags ? tags[0] : null));
+      if (origEncUrl)
+      {
+        if (item.enclosures.length)
+          item.enclosures[0].mURL = origEncUrl;
+        else
+          item.enclosures.push(new FeedEnclosure(origEncUrl));
+      }
+
+      // Handle atom threading extension, RFC4685.  There may be 1 or more tags,
+      // and each must contain a ref attribute with 1 Message-Id equivalent
+      // value.  This is the only attr of interest in the spec for presentation.
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_THREAD_NS, "in-reply-to");
+      if (tags)
+      {
+        for (let tag of tags)
+        {
+          let ref = this.removeUnprintableASCII(tag.getAttribute("ref"));
+          if (ref)
+            item.inReplyTo += item.normalizeMessageID(ref) + " ";
+        }
+        item.inReplyTo = item.inReplyTo.trimRight();
+      }
+
+      // Support <category> and autotagging.
+      tags = this.childrenByTagNameNS(itemNode, FeedUtils.ATOM_IETF_NS, "category");
+      if (tags)
+      {
+        for (let tag of tags)
+        {
+          let term = this.removeUnprintableASCII(tag.getAttribute("term"));
+          term = term ? this.xmlUnescape(term.replace(/,/g, ";")).trim() : null;
+          if (term && item.keywords.indexOf(term) == -1)
+            item.keywords.push(term);
+        }
+      }
+
+      parsedItems.push(item);
+    }
+
+    return parsedItems;
+  },
+
+  isPermanentRedirect: function(aFeed, aRedirDocChannel, aFeedChannel, aDS)
+  {
+    // If subscribing to a new feed, do not check redirect tags.
+    if (!aFeed.downloadCallback || aFeed.downloadCallback.mSubscribeMode)
+      return false;
+
+    let tags, tagName, newUrl;
+    let oldUrl = aFeed.url;
+
+    // Check for RSS2.0 redirect document <newLocation> tag.
+    if (aRedirDocChannel)
+    {
+      tagName = "newLocation";
+      tags = this.childrenByTagNameNS(aRedirDocChannel, "", tagName);
+      newUrl = this.getNodeValue(tags ? tags[0] : null);
+    }
+
+    // Check for <itunes:new-feed-url> tag.
+    if (aFeedChannel)
+    {
+      tagName = "new-feed-url";
+      if (aDS)
+      {
+        tags = FeedUtils.rdf.GetResource(FeedUtils.ITUNES_NS + tagName);
+        newUrl = this.getRDFTargetValue(aDS, aFeedChannel, tags);
+      }
+      else
+      {
+        tags = this.childrenByTagNameNS(aFeedChannel, FeedUtils.ITUNES_NS, tagName);
+        newUrl = this.getNodeValue(tags ? tags[0] : null);
+      }
+      tagName = "itunes:" + tagName;
+    }
+
+    if (newUrl && newUrl != oldUrl && FeedUtils.isValidScheme(newUrl) &&
+        FeedUtils.changeUrlForFeed(aFeed, newUrl))
+    {
+      FeedUtils.log.info("FeedParser.isPermanentRedirect: found <" + tagName +
+                         "> tag; updated feed url from: " + oldUrl + " to: " + newUrl +
+                         " in folder: " + FeedUtils.getFolderPrettyPath(aFeed.folder));
+      aFeed.onUrlChange(aFeed, oldUrl);
+      return true;
+    }
+
+    return false;
+  },
+
+  serializeTextConstruct: function(textElement)
+  {
+    let content = "";
+    if (textElement)
+    {
+      let textType = textElement.getAttribute("type");
+
+      // Atom spec says consider it "text" if not present.
+      if (!textType)
+        textType = "text";
+
+      // There could be some strange content type we don't handle.
+      if (textType != "text" && textType != "html" && textType != "xhtml")
+        return null;
+
+      for (let j = 0; j < textElement.childNodes.length; j++)
+      {
+        let node = textElement.childNodes.item(j);
+        if (node.nodeType == node.CDATA_SECTION_NODE)
+          content += this.xmlEscape(node.data);
+        else
+          content += this.mSerializer.serializeToString(node);
+      }
+
+      if (textType == "html")
+        content = this.xmlUnescape(content);
+
+      content = content.trim();
+    }
+
+    // Other parts of the code depend on this being null if there's no content.
+    return content ? content : null;
+  },
+
+  getRDFTargetValue: function(ds, source, property)
+  {
+    let nodeValue = this.getRDFTargetValueRaw(ds, source, property);
+    if (!nodeValue)
+      return null;
+
+    nodeValue = nodeValue.replace(/[\n\r\t]+/g, " ");
+    return this.removeUnprintableASCII(nodeValue);
+
+  },
+
+  getRDFTargetValueFormatted: function(ds, source, property)
+  {
+    let nodeValue = this.getRDFTargetValueRaw(ds, source, property);
+    if (!nodeValue)
+      return null;
+
+    return this.removeUnprintableASCIIexCRLFTAB(nodeValue);
+
+  },
+
+  getRDFTargetValueRaw: function(ds, source, property)
+  {
+    let node = ds.GetTarget(source, property, true);
+    if (node)
+    {
+      try
+      {
+        node = node.QueryInterface(Ci.nsIRDFLiteral);
+        if (node)
+          return node.Value.trim();
+      }
+      catch (e)
+      {
+        // If the RDF was bogus, do nothing.  Rethrow if it's some other problem.
+        if (!((e instanceof Ci.nsIXPCException) &&
+              e.result == Cr.NS_ERROR_NO_INTERFACE))
+          throw new Error("FeedParser.getRDFTargetValue: " + e);
+      }
+    }
+
+    return null;
+  },
+
+  /**
+   * Return a cleaned up node value. This is intended for values that are not
+   * multiline and not formatted. A sequence of tab or newline is converted to
+   * a space and unprintable ascii is removed.
+   *
+   * @param {Node} node  - A DOM node.
+   * @return {String}    - A clean string value or null.
+   */
+  getNodeValue: function(node)
+  {
+    let nodeValue = this.getNodeValueRaw(node);
+    if (!nodeValue)
+      return null;
+
+    nodeValue = nodeValue.replace(/[\n\r\t]+/g, " ");
+    return this.removeUnprintableASCII(nodeValue);
+  },
+
+  /**
+   * Return a cleaned up formatted node value, meaning CR/LF/TAB are retained
+   * while all other unprintable ascii is removed. This is intended for values
+   * that are multiline and formatted, such as content or description tags.
+   *
+   * @param {Node} node  - A DOM node.
+   * @return {String}    - A clean string value or null.
+   */
+  getNodeValueFormatted: function(node)
+  {
+    let nodeValue = this.getNodeValueRaw(node);
+    if (!nodeValue)
+      return null;
+
+    return this.removeUnprintableASCIIexCRLFTAB(nodeValue);
+  },
+
+  /**
+   * Return a raw node value, as received. This should be sanitized as
+   * appropriate.
+   *
+   * @param {Node} node  - A DOM node.
+   * @return {String}    - A string value or null.
+   */
+  getNodeValueRaw: function(node)
+  {
+    if (node && node.textContent)
+      return node.textContent.trim();
+
+    if (node && node.firstChild)
+    {
+      let ret = "";
+      for (let child = node.firstChild; child; child = child.nextSibling)
+      {
+        let value = this.getNodeValueRaw(child);
+        if (value)
+          ret += value;
+      }
+
+      if (ret)
+        return ret.trim();
+    }
+
+    return null;
+  },
+
+  // Finds elements that are direct children of the first arg.
+  childrenByTagNameNS: function(aElement, aNamespace, aTagName)
+  {
+    if (!aElement)
+      return null;
+
+    let matches = aElement.getElementsByTagNameNS(aNamespace, aTagName);
+    let matchingChildren = new Array();
+    for (let match of matches)
+    {
+      if (match.parentNode == aElement)
+        matchingChildren.push(match)
+    }
+
+    return matchingChildren.length ? matchingChildren : null;
+  },
+
+  /**
+   * Ensure <link> type tags start with http[s]://, ftp:// or magnet:
+   * for values stored in mail headers (content-base and remote enclosures),
+   * particularly to prevent data: uris, javascript, and other spoofing.
+   *
+   * @param {String} link - An intended http url string.
+   * @return {String}     - A clean string starting with http, ftp or magnet,
+   *                        else null.
+   */
+  validLink: function(link)
+  {
+    if (/^((https?|ftp):\/\/|magnet:)/.test(link))
+      return this.removeUnprintableASCII(link.trim());
+
+    return null;
+  },
+
+  findAtomLink: function(linkRel, linkElements)
+  {
+    if (!linkElements)
+      return null;
+
+    // XXX Need to check for MIME type and hreflang.
+    for (let alink of linkElements) {
+      if (alink &&
+          // If there's a link rel.
+          ((alink.getAttribute("rel") && alink.getAttribute("rel") == linkRel) ||
+           // If there isn't, assume 'alternate'.
+           (!alink.getAttribute("rel") && (linkRel == "alternate"))) &&
+          alink.getAttribute("href"))
+      {
+        // Atom links are interpreted relative to xml:base.
+        try {
+          return Services.io.newURI(alink.baseURI, null, null).
+                             resolve(alink.getAttribute("href"));
+        }
+        catch (ex) {}
+      }
+    }
+
+    return null;
+  },
+
+  /**
+   * Remove unprintable ascii, particularly CR/LF, for non formatted tag values.
+   *
+   * @param {String} s - String to clean.
+   * @return {String}
+   */
+  removeUnprintableASCII: function(s)
+  {
+    return s ? s.replace(/[\x00-\x1F\x7F]+/g, "") : "";
+  },
+
+  /**
+   * Remove unprintable ascii, except CR/LF/TAB, for formatted tag values.
+   *
+   * @param {String} s - String to clean.
+   * @return {String}
+   */
+  removeUnprintableASCIIexCRLFTAB: function(s)
+  {
+    return s ? s.replace(/[\x00-\x08\x0B-\x0C\x0E-\x1F\x7F]+/g, "") : "";
+  },
+
+  stripTags: function(someHTML)
+  {
+    return someHTML ? someHTML.replace(/<[^>]+>/g, "") : someHTML;
+  },
+
+  xmlUnescape: function(s)
+  {
+    s = s.replace(/&lt;/g, "<");
+    s = s.replace(/&gt;/g, ">");
+    s = s.replace(/&amp;/g, "&");
+    return s;
+  },
+
+  xmlEscape: function(s)
+  {
+    s = s.replace(/&/g, "&amp;");
+    s = s.replace(/>/g, "&gt;");
+    s = s.replace(/</g, "&lt;");
+    return s;
+  },
+
+  dateRescue: function(dateString)
+  {
+    // Deal with various kinds of invalid dates.
+    if (!isNaN(parseInt(dateString)))
+    {
+      // It's an integer, so maybe it's a timestamp.
+      let d = new Date(parseInt(dateString) * 1000);
+      let now = new Date();
+      let yeardiff = now.getFullYear() - d.getFullYear();
+      FeedUtils.log.trace("FeedParser.dateRescue: Rescue Timestamp date - " +
+                          d.toString() + " ,year diff - " + yeardiff);
+      if (yeardiff >= 0 && yeardiff < 3)
+        // It's quite likely the correct date.
+        return d.toString();
+    }
+
+    // Could be an ISO8601/W3C date.  If not, get the current time.
+    return FeedUtils.getValidRFC5322Date(dateString);
+  }
+};
diff --git a/mailnews/extensions/newsblog/content/feed-subscriptions.js b/mailnews/extensions/newsblog/content/feed-subscriptions.js
new file mode 100644
index 000000000..2b77e60c4
--- /dev/null
+++ b/mailnews/extensions/newsblog/content/feed-subscriptions.js
@@ -0,0 +1,2703 @@
+/* -*- Mode: JavaScript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+Components.utils.import("resource:///modules/FeedUtils.jsm");
+Components.utils.import("resource:///modules/gloda/log4moz.js");
+Components.utils.import("resource:///modules/mailServices.js");
+Components.utils.import("resource://gre/modules/FileUtils.jsm");
+Components.utils.import("resource://gre/modules/PluralForm.jsm");
+Components.utils.import("resource://gre/modules/Services.jsm");
+
+var {classes: Cc, interfaces: Ci} = Components;
+
+var FeedSubscriptions = {
+  get mMainWin() { return Services.wm.getMostRecentWindow("mail:3pane"); },
+
+  get mTree() { return document.getElementById("rssSubscriptionsList"); },
+
+  mFeedContainers: [],
+  mRSSServer     : null,
+  mActionMode    : null,
+  kSubscribeMode : 1,
+  kUpdateMode    : 2,
+  kMoveMode      : 3,
+  kCopyMode      : 4,
+  kImportingOPML : 5,
+  kVerifyUrlMode : 6,
+
+  get FOLDER_ACTIONS()
+  {
+    return Ci.nsIMsgFolderNotificationService.folderAdded |
+           Ci.nsIMsgFolderNotificationService.folderDeleted |
+           Ci.nsIMsgFolderNotificationService.folderRenamed |
+           Ci.nsIMsgFolderNotificationService.folderMoveCopyCompleted;
+  },
+
+  onLoad: function ()
+  {
+    // Extract the folder argument.
+    let folder;
+    if (window.arguments && window.arguments[0].folder)
+      folder = window.arguments[0].folder;
+
+    // Ensure dialog is fully loaded before selecting, to get visible row.
+    setTimeout(function() {
+      FeedSubscriptions.refreshSubscriptionView(folder)
+    }, 100);
+    let message = FeedUtils.strings.GetStringFromName("subscribe-loading");
+    this.updateStatusItem("statusText", message);
+
+    FeedUtils.CANCEL_REQUESTED = false;
+
+    if (this.mMainWin)
+    {
+      this.mMainWin.FeedFolderNotificationService = MailServices.mfn;
+      this.mMainWin.FeedFolderNotificationService
+                   .addListener(this.FolderListener, this.FOLDER_ACTIONS);
+    }
+  },
+
+  onClose: function ()
+  {
+    let dismissDialog = true;
+
+    // If we are in the middle of subscribing to a feed, inform the user that
+    // dismissing the dialog right now will abort the feed subscription.
+    if (this.mActionMode == this.kSubscribeMode)
+    {
+      let pTitle = FeedUtils.strings.GetStringFromName(
+                     "subscribe-cancelSubscriptionTitle");
+      let pMessage = FeedUtils.strings.GetStringFromName(
+                       "subscribe-cancelSubscription");
+      dismissDialog =
+        !(Services.prompt.confirmEx(window, pTitle, pMessage,
+                                    Ci.nsIPromptService.STD_YES_NO_BUTTONS,
+                                    null, null, null, null, { }));
+    }
+
+    if (dismissDialog)
+    {
+      FeedUtils.CANCEL_REQUESTED = this.mActionMode == this.kSubscribeMode;
+      if (this.mMainWin)
+      {
+        this.mMainWin.FeedFolderNotificationService
+                     .removeListener(this.FolderListener, this.FOLDER_ACTIONS);
+        delete this.mMainWin.FeedFolderNotificationService;
+      }
+    }
+
+    return dismissDialog;
+  },
+
+  refreshSubscriptionView: function(aSelectFolder, aSelectFeedUrl)
+  {
+    let item = this.mView.currentItem;
+    this.loadSubscriptions();
+    this.mTree.view = this.mView;
+
+    if (aSelectFolder && !aSelectFeedUrl)
+      this.selectFolder(aSelectFolder);
+    else
+    {
+      // If no folder to select, try to select the pre rebuild selection, in
+      // an existing window.  For folderpane changes in a feed account.
+      if (item)
+      {
+        let rootFolder = item.container ? item.folder.rootFolder :
+                                          item.parentFolder.rootFolder;
+        if (item.container)
+        {
+          if (!this.selectFolder(item.folder, { open: item.open }))
+            // The item no longer exists, an ancestor folder was deleted or
+            // renamed/moved.
+            this.selectFolder(rootFolder);
+        }
+        else {
+          let url = item.parentFolder == aSelectFolder ? aSelectFeedUrl :
+                                                         item.url;
+          this.selectFeed({ folder: rootFolder, url: url }, null);
+        }
+      }
+    }
+
+    this.mView.treeBox.ensureRowIsVisible(this.mView.selection.currentIndex);
+    this.clearStatusInfo();
+  },
+
+  mView:
+  {
+    kRowIndexUndefined: -1,
+
+    get currentItem() {
+      // Get the current selection, if any.
+      let seln = this.selection;
+      let currentSelectionIndex = seln ? seln.currentIndex : null;
+      let item;
+      if (currentSelectionIndex != null)
+        item = this.getItemAtIndex(currentSelectionIndex);
+
+      return item;
+    },
+
+    /* nsITreeView */
+    treeBox: null,
+
+    mRowCount: 0,
+    get rowCount()                         { return this.mRowCount; },
+
+    _selection: null,
+    get selection ()                       { return this._selection; },
+    set selection (val)                    { return this._selection = val; },
+
+    setTree: function(aTreebox)            { this.treeBox = aTreebox; },
+    isSeparator: function(aRow)            { return false; },
+    isSorted: function()                   { return false; },
+    isSelectable: function(aRow, aColumn)  { return false; },
+    isEditable: function (aRow, aColumn)   { return false; },
+
+    getProgressMode : function(aRow, aCol) {},
+    cycleHeader: function(aCol)            {},
+    cycleCell: function(aRow, aCol)        {},
+    selectionChanged: function()           {},
+    performAction: function(aAction)       {},
+    performActionOnRow: function (aAction, aRow)       {},
+    performActionOnCell: function(aAction, aRow, aCol) {},
+    getRowProperties: function(aRow)                   { return ""; },
+    getColumnProperties: function(aCol)                { return ""; },
+    getCellValue: function (aRow, aColumn)             {},
+    setCellValue: function (aRow, aColumn, aValue)     {},
+    setCellText: function (aRow, aColumn, aValue)      {},
+
+    getCellProperties: function (aRow, aColumn) {
+      let item = this.getItemAtIndex(aRow);
+      let folder = item && item.folder ? item.folder : null;
+#ifdef MOZ_THUNDERBIRD
+      let properties = ["folderNameCol"];
+      let hasFeeds = folder ? FeedUtils.getFeedUrlsInFolder(folder) : false;
+      let prop = !folder ? "isFeed-true" :
+                 hasFeeds ? "isFeedFolder-true" :
+                 folder.isServer ? "serverType-rss isServer-true" : null;
+      if (prop)
+        properties.push(prop);
+      return properties.join(" ");
+#else
+      return !folder ? "serverType-rss" :
+             folder.isServer ? "serverType-rss isServer-true" : "livemark";
+#endif
+    },
+
+    isContainer: function (aRow)
+    {
+      let item = this.getItemAtIndex(aRow);
+      return item ? item.container : false;
+    },
+
+    isContainerOpen: function (aRow)
+    { 
+      let item = this.getItemAtIndex(aRow);
+      return item ? item.open : false;
+    },
+
+    isContainerEmpty: function (aRow)
+    { 
+      let item = this.getItemAtIndex(aRow);
+      if (!item) 
+        return false;
+
+      return item.children.length == 0;
+    },
+
+    getItemAtIndex: function (aRow)
+    {
+      if (aRow < 0 || aRow >= FeedSubscriptions.mFeedContainers.length)
+        return null;
+
+      return FeedSubscriptions.mFeedContainers[aRow];
+    },
+
+    getItemInViewIndex: function(aFolder)
+    {
+      if (!aFolder || !(aFolder instanceof Ci.nsIMsgFolder))
+        return null;
+
+      for (let index = 0; index < this.rowCount; index++)
+      {
+        // Find the visible folder in the view.
+        let item = this.getItemAtIndex(index);
+        if (item && item.container && item.url == aFolder.URI)
+          return index;
+      }
+
+      return null;
+    },
+
+    removeItemAtIndex: function (aRow, aNoSelect)
+    {
+      let itemToRemove = this.getItemAtIndex(aRow);
+      if (!itemToRemove)
+        return;
+
+      if (itemToRemove.container && itemToRemove.open)
+        // Close it, if open container.
+        this.toggleOpenState(aRow);
+
+      let parentIndex = this.getParentIndex(aRow);
+      let hasNextSibling = this.hasNextSibling(aRow, aRow);
+      if (parentIndex != this.kRowIndexUndefined)
+      {
+        let parent = this.getItemAtIndex(parentIndex);
+        if (parent)
+        {
+          for (let index = 0; index < parent.children.length; index++)
+            if (parent.children[index] == itemToRemove)
+            {
+              parent.children.splice(index, 1);
+              break;
+            }
+        }
+      }
+
+      // Now remove it from our view.
+      FeedSubscriptions.mFeedContainers.splice(aRow, 1);
+
+      // Now invalidate the correct tree rows.
+      this.mRowCount--;
+      this.treeBox.rowCountChanged(aRow, -1);
+
+      // Now update the selection position, unless noSelect (selection is
+      // done later or not at all).  If the item is the last child, select the
+      // parent.  Otherwise select the next sibling.
+      if (!aNoSelect) {
+        if (aRow <= FeedSubscriptions.mFeedContainers.length)
+          this.selection.select(hasNextSibling ? aRow : aRow - 1);
+        else
+          this.selection.clearSelection();
+      }
+
+      // Now refocus the tree.
+      FeedSubscriptions.mTree.focus();
+    },
+
+    getCellText: function (aRow, aColumn)
+    {
+      let item = this.getItemAtIndex(aRow);
+      return (item && aColumn.id == "folderNameCol") ? item.name : "";
+    },
+
+    getImageSrc: function(aRow, aCol)
+    {
+      let item = this.getItemAtIndex(aRow);
+      if ((item.folder && item.folder.isServer) || item.open)
+        return "";
+
+      if (item.favicon != null)
+        return item.favicon;
+
+      if (item.folder && FeedSubscriptions.mMainWin &&
+          "gFolderTreeView" in FeedSubscriptions.mMainWin) {
+        let favicon = FeedSubscriptions.mMainWin.gFolderTreeView
+                                       .getFolderCacheProperty(item.folder, "favicon");
+        if (favicon != null)
+          return item.favicon = favicon;
+      }
+
+      let callback = (iconUrl => {
+        item.favicon = iconUrl;
+        if (item.folder)
+        {
+          for (let child of item.children)
+            if (!child.container)
+            {
+              child.favicon = iconUrl;
+              break;
+            }
+        }
+
+        this.selection.tree.invalidateRow(aRow);
+      });
+
+      // A closed non server folder.
+      if (item.folder)
+      {
+        for (let child of item.children)
+        {
+          if (!child.container) {
+            if (child.favicon != null)
+              return child.favicon;
+
+            setTimeout(() => {
+              FeedUtils.getFavicon(child.parentFolder, child.url, null,
+                                   window, callback);
+            }, 0);
+            break;
+          }
+        }
+      }
+      else
+      {
+        // A feed.
+        setTimeout(() => {
+          FeedUtils.getFavicon(item.parentFolder, item.url, null,
+                               window, callback);
+        }, 0);
+      }
+
+      // Store empty string to return default while favicons are retrieved.
+      return item.favicon = "";
+    },
+
+    canDrop: function (aRow, aOrientation)
+    { 
+      let dropResult = this.extractDragData(aRow);
+      return aOrientation == Ci.nsITreeView.DROP_ON && dropResult.canDrop &&
+             (dropResult.dropUrl || dropResult.dropOnIndex != this.kRowIndexUndefined);
+    },
+
+    drop: function (aRow, aOrientation)
+    {
+      let win = FeedSubscriptions;
+      let results = this.extractDragData(aRow);
+      if (!results.canDrop)
+        return;
+
+      // Preselect the drop folder.
+      this.selection.select(aRow);
+
+      if (results.dropUrl)
+      {
+        // Don't freeze the app that initiated the drop just because we are
+        // in a loop waiting for the user to dimisss the add feed dialog.
+        setTimeout(function() {
+          win.addFeed(results.dropUrl, null, true, null, win.kSubscribeMode);
+        }, 0);
+        let folderItem = this.getItemAtIndex(aRow);
+        FeedUtils.log.debug("drop: folder, url - " +
+                            folderItem.folder.name + ", " + results.dropUrl);
+      }
+      else if (results.dropOnIndex != this.kRowIndexUndefined)
+      {
+        win.moveCopyFeed(results.dropOnIndex, aRow, results.dropEffect);
+      }
+    },
+
+    // Helper function for drag and drop.
+    extractDragData: function(aRow)
+    {
+      let dt = this._currentDataTransfer;
+      let dragDataResults = { canDrop:     false,
+                              dropUrl:     null,
+                              dropOnIndex: this.kRowIndexUndefined,
+                              dropEffect:  dt.dropEffect };
+
+      if (dt.getData("text/x-moz-feed-index"))
+      {
+        // Dragging a feed in the tree.
+        if (this.selection)
+        {
+          dragDataResults.dropOnIndex = this.selection.currentIndex;
+
+          let curItem = this.getItemAtIndex(this.selection.currentIndex);
+          let newItem = this.getItemAtIndex(aRow);
+          let curServer = curItem && curItem.parentFolder ?
+                            curItem.parentFolder.server : null;
+          let newServer = newItem && newItem.folder ?
+                            newItem.folder.server : null;
+
+          // No copying within the same account and no moving to the account
+          // folder in the same account.
+          if (!(curServer == newServer &&
+                (dragDataResults.dropEffect == "copy" ||
+                 newItem.folder == curItem.parentFolder ||
+                 newItem.folder.isServer)))
+            dragDataResults.canDrop = true;
+        }
+      }
+      else
+      {
+        // Try to get a feed url.
+        let validUri = FeedUtils.getFeedUriFromDataTransfer(dt);
+
+        if (validUri)
+        {
+          dragDataResults.canDrop = true;
+          dragDataResults.dropUrl = validUri.spec;
+        }
+      }
+
+      return dragDataResults;
+    },
+
+    getParentIndex: function (aRow)
+    {
+      let item = this.getItemAtIndex(aRow);
+
+      if (item)
+      {
+        for (let index = aRow; index >= 0; index--)
+          if (FeedSubscriptions.mFeedContainers[index].level < item.level)
+            return index;
+      }
+
+      return this.kRowIndexUndefined;
+    },
+
+    isIndexChildOfParentIndex: function (aRow, aChildRow)
+    {
+      // For visible tree rows, not if items are children of closed folders.
+      let item = this.getItemAtIndex(aRow);
+      if (!item || aChildRow <= aRow)
+        return false;
+
+      let targetLevel = this.getItemAtIndex(aRow).level;
+      let rows = FeedSubscriptions.mFeedContainers;
+
+      for (let i = aRow + 1; i < rows.length; i++) {
+        if (this.getItemAtIndex(i).level <= targetLevel)
+          break;
+        if (aChildRow == i)
+          return true;
+      }
+
+      return false;
+    },
+
+    hasNextSibling: function(aRow, aAfterIndex) {
+      let targetLevel = this.getItemAtIndex(aRow).level;
+      let rows = FeedSubscriptions.mFeedContainers;
+      for (let i = aAfterIndex + 1; i < rows.length; i++) {
+        if (this.getItemAtIndex(i).level == targetLevel)
+          return true;
+        if (this.getItemAtIndex(i).level < targetLevel)
+          return false;
+      }
+
+      return false;
+    },
+
+    hasPreviousSibling: function (aRow)
+    {
+      let item = this.getItemAtIndex(aRow);
+      if (item && aRow)
+        return this.getItemAtIndex(aRow - 1).level == item.level;
+      else
+        return false;
+    },
+
+    getLevel: function (aRow)
+    {
+      let item = this.getItemAtIndex(aRow);
+      if (!item)
+        return 0;
+
+      return item.level;
+    },
+
+    toggleOpenState: function (aRow)
+    {
+      let item = this.getItemAtIndex(aRow);
+      if (!item)
+        return;
+
+      // Save off the current selection item.
+      let seln = this.selection;
+      let currentSelectionIndex = seln.currentIndex;
+
+      let rowsChanged = this.toggle(aRow)
+
+      // Now restore selection, ensuring selection is maintained on toggles.
+      if (currentSelectionIndex > aRow)
+        seln.currentIndex = currentSelectionIndex + rowsChanged;
+      else
+        seln.select(currentSelectionIndex);
+
+      seln.selectEventsSuppressed = false;
+    },
+
+    toggle: function (aRow)
+    {
+      // Collapse the row, or build sub rows based on open states in the map.
+      let item = this.getItemAtIndex(aRow);
+      if (!item)
+        return null;
+
+      let rows = FeedSubscriptions.mFeedContainers;
+      let rowCount = 0;
+      let multiplier;
+
+      function addDescendants(aItem)
+      {
+        for (let i = 0; i < aItem.children.length; i++)
+        {
+          rowCount++;
+          let child = aItem.children[i];
+          rows.splice(aRow + rowCount, 0, child);
+          if (child.open)
+            addDescendants(child);
+        }
+      }
+
+      if (item.open)
+      {
+        // Close the container.  Add up all subfolders and their descendants
+        // who may be open.
+        multiplier = -1;
+        let nextRow = aRow + 1;
+        let nextItem = rows[nextRow];
+        while (nextItem && nextItem.level > item.level)
+        {
+          rowCount++;
+          nextItem = rows[++nextRow];
+        }
+
+        rows.splice(aRow + 1, rowCount);
+      }
+      else
+      {
+        // Open the container.  Restore the open state of all subfolder and
+        // their descendants.
+        multiplier = 1;
+        addDescendants(item);
+      }
+
+      let delta = multiplier * rowCount;
+      this.mRowCount += delta;
+
+      item.open = !item.open;
+      // Suppress the select event caused by rowCountChanged.
+      this.selection.selectEventsSuppressed = true;
+      // Add or remove the children from our view.
+      this.treeBox.rowCountChanged(aRow, delta);
+      return delta;
+    }
+  },
+
+  makeFolderObject: function (aFolder, aCurrentLevel)
+  {
+    let defaultQuickMode = aFolder.server.getBoolValue("quickMode");
+    let optionsAcct = aFolder.isServer ? FeedUtils.getOptionsAcct(aFolder.server) :
+                                         null;
+    let open = !aFolder.isServer &&
+               aFolder.server == this.mRSSServer &&
+               this.mActionMode == this.kImportingOPML ? true : false
+    let folderObject =  { children : [],
+                          folder   : aFolder,
+                          name     : aFolder.prettyName,
+                          level    : aCurrentLevel,
+                          url      : aFolder.URI,
+                          quickMode: defaultQuickMode,
+                          options  : optionsAcct,
+                          open     : open,
+                          container: true,
+                          favicon  : null };
+
+    // If a feed has any sub folders, add them to the list of children.
+    let folderEnumerator = aFolder.subFolders;
+
+    while (folderEnumerator.hasMoreElements())
+    {
+      let folder = folderEnumerator.getNext();
+      if ((folder instanceof Ci.nsIMsgFolder) &&
+          !folder.getFlag(Ci.nsMsgFolderFlags.Trash) &&
+          !folder.getFlag(Ci.nsMsgFolderFlags.Virtual))
+      {
+        folderObject.children
+                    .push(this.makeFolderObject(folder, aCurrentLevel + 1));
+      }
+    }
+
+    let feeds = this.getFeedsInFolder(aFolder);
+    for (let feed of feeds)
+    {
+      // Now add any feed urls for the folder.
+      folderObject.children.push(this.makeFeedObject(feed,
+                                                     aFolder,
+                                                     aCurrentLevel + 1));
+    }
+
+    // Finally, set the folder's quickMode based on the its first feed's
+    // quickMode, since that is how the view determines summary mode, and now
+    // quickMode is updated to be the same for all feeds in a folder.
+    if (feeds && feeds[0])
+      folderObject.quickMode = feeds[0].quickMode;
+
+    folderObject.children = this.folderItemSorter(folderObject.children);
+
+    return folderObject;
+  },
+
+  folderItemSorter: function (aArray)
+  {
+    return aArray.sort(function(a, b) { return a.name.toLowerCase() >
+                                               b.name.toLowerCase() }).
+                  sort(function(a, b) { return a.container < b.container });
+  },
+
+  getFeedsInFolder: function (aFolder)
+  {
+    let feeds = new Array();
+    let feedUrlArray = FeedUtils.getFeedUrlsInFolder(aFolder);
+    if (!feedUrlArray)
+      // No feedUrls in this folder.
+      return feeds;
+
+    for (let url of feedUrlArray)
+    {
+      let feedResource = FeedUtils.rdf.GetResource(url);
+      let feed = new Feed(feedResource, aFolder.server);
+      feeds.push(feed);
+    }
+
+    return feeds;
+  },
+
+  makeFeedObject: function (aFeed, aFolder, aLevel)
+  {
+    // Look inside the data source for the feed properties.
+    let feed = { children    : [],
+                 parentFolder: aFolder,
+                 name        : aFeed.title || aFeed.description || aFeed.url,
+                 url         : aFeed.url,
+                 quickMode   : aFeed.quickMode,
+                 options     : aFeed.options || FeedUtils.optionsTemplate,
+                 level       : aLevel,
+                 open        : false,
+                 container   : false,
+                 favicon     : null };
+    return feed;
+  },
+
+  loadSubscriptions: function ()
+  {
+    // Put together an array of folders.  Each feed account level folder is
+    // included as the root.
+    let numFolders = 0;
+    let feedContainers = [];
+    // Get all the feed account folders.
+    let feedRootFolders = FeedUtils.getAllRssServerRootFolders();
+
+    feedRootFolders.forEach(function(rootFolder) {
+      feedContainers.push(this.makeFolderObject(rootFolder, 0));
+      numFolders++;
+    }, this);
+
+    this.mFeedContainers = feedContainers;
+    this.mView.mRowCount = numFolders;
+
+    FeedSubscriptions.mTree.focus();
+  },
+
+  /**
+   * Find the folder in the tree.  The search may be limited to subfolders of
+   * a known folder, or expanded to include the entire tree. This function is
+   * also used to insert/remove folders without rebuilding the tree view cache
+   * (to avoid position/toggle state loss).
+   * 
+   * @param  aFolder nsIMsgFolder - the folder to find.
+   * @param  [aParams] object     - params object, containing:
+   * 
+   * [parentIndex] int        - index of folder to start the search; if
+   *                            null (default), the index of the folder's
+   *                            rootFolder will be used.
+   * [select] boolean         - if true (default) the folder's ancestors
+   *                            will be opened and the folder selected.
+   * [open] boolean           - if true (default) the folder is opened.
+   * [remove] boolean         - delete the item from tree row cache if true,
+   *                            false (default) otherwise.
+   * [newFolder] nsIMsgFolder - if not null (default) the new folder,
+   *                            for add or rename.
+   * 
+   * @return bool found - true if found, false if not.
+   */
+  selectFolder: function(aFolder, aParms)
+  {
+    let folderURI = aFolder.URI;
+    let parentIndex = aParms && ("parentIndex" in aParms) ? aParms.parentIndex : null;
+    let selectIt = aParms && ("select" in aParms) ? aParms.select : true;
+    let openIt = aParms && ("open" in aParms) ? aParms.open : true;
+    let removeIt = aParms && ("remove" in aParms) ? aParms.remove : false;
+    let newFolder = aParms && ("newFolder" in aParms) ? aParms.newFolder : null;
+    let startIndex, startItem;
+    let found = false;
+
+    let firstVisRow, curFirstVisRow, curLastVisRow;
+    if (this.mView.treeBox)
+      firstVisRow = this.mView.treeBox.getFirstVisibleRow();
+
+    if (parentIndex != null)
+    {
+      // Use the parentIndex if given.
+      startIndex = parentIndex;
+      if (aFolder.isServer)
+        // Fake item for account root folder.
+        startItem = { name: "AccountRoot",
+                      children: [this.mView.getItemAtIndex(startIndex)],
+                      container: true, open: false, url: null, level: -1};
+      else
+        startItem = this.mView.getItemAtIndex(startIndex);
+    }
+    else
+    {
+      // Get the folder's root parent index.
+      let index = 0;
+      for (index; index < this.mView.rowCount; index++)
+      {
+        let item = this.mView.getItemAtIndex(index);
+        if (item.url == aFolder.server.rootFolder.URI)
+          break;
+      }
+      startIndex = index;
+      if (aFolder.isServer)
+        // Fake item for account root folder.
+        startItem = { name: "AccountRoot",
+                      children: [this.mView.getItemAtIndex(startIndex)],
+                      container: true, open: false, url: null, level: -1};
+      else
+        startItem = this.mView.getItemAtIndex(startIndex);
+    }
+
+    function containsFolder(aItem)
+    {
+      // Search for the folder.  If it's found, set the open state on all
+      // ancestor folders.  A toggle() rebuilds the view rows to match the map.
+      if (aItem.url == folderURI)
+        return found = true;
+
+      for (let i = 0; i < aItem.children.length; i++) {
+        if (aItem.children[i].container && containsFolder(aItem.children[i]))
+        {
+          if (removeIt && aItem.children[i].url == folderURI)
+          {
+            // Get all occurences in the tree cache arrays.
+            FeedUtils.log.debug("selectFolder: delete in cache, " +
+                                "parent:children:item:index - "+
+                                aItem.name + ":" + aItem.children.length + ":" +
+                                aItem.children[i].name + ":" + i);
+            aItem.children.splice(i, 1);
+            FeedUtils.log.debug("selectFolder: deleted in cache, " +
+                                "parent:children - " +
+                                aItem.name + ":" + aItem.children.length);
+            removeIt = false;
+            return true;
+          }
+          if (newFolder)
+          {
+            let newItem = FeedSubscriptions.makeFolderObject(newFolder,
+                                                             aItem.level + 1);
+            newItem.open = aItem.children[i].open;
+            if (newFolder.isServer)
+              FeedSubscriptions.mFeedContainers[startIndex] = newItem;
+            else
+            {
+              aItem.children[i] = newItem;
+              aItem.children = FeedSubscriptions.folderItemSorter(aItem.children);
+            }
+            FeedUtils.log.trace("selectFolder: parentName:newFolderName:newFolderItem - " +
+                                aItem.name + ":" + newItem.name + ":" + newItem.toSource());
+            newFolder = null;
+            return true;
+          }
+          if (!found)
+          {
+            // For the folder to find.
+            found = true;
+            aItem.children[i].open = openIt;
+          }
+          else
+          {
+            // For ancestor folders.
+            if (selectIt || openIt)
+              aItem.children[i].open = true;
+          }
+
+          return true;
+        }
+      }
+
+      return false;
+    }
+
+    if (startItem)
+    {
+      // Find a folder with a specific parent.
+      containsFolder(startItem);
+      if (!found)
+        return false;
+
+      if (!selectIt)
+        return true;
+
+      if (startItem.open)
+        this.mView.toggle(startIndex);
+      this.mView.toggleOpenState(startIndex);
+    }
+
+    for (let index = 0; index < this.mView.rowCount && selectIt; index++)
+    {
+      // The desired folder is now in the view.
+      let item = this.mView.getItemAtIndex(index);
+      if (!item.container)
+        continue;
+      if (item.url == folderURI)
+      {
+        if (item.children.length &&
+            ((!item.open && openIt) || (item.open && !openIt)))
+          this.mView.toggleOpenState(index);
+        this.mView.selection.select(index);
+        found = true;
+        break;
+      }
+    }
+
+    // Ensure tree position does not jump unnecessarily.
+    curFirstVisRow = this.mView.treeBox.getFirstVisibleRow();
+    curLastVisRow = this.mView.treeBox.getLastVisibleRow();
+    if (firstVisRow >= 0 &&
+        this.mView.rowCount - curLastVisRow > firstVisRow - curFirstVisRow)
+      this.mView.treeBox.scrollToRow(firstVisRow);
+    else
+      this.mView.treeBox.ensureRowIsVisible(this.mView.rowCount - 1);
+
+    FeedUtils.log.debug("selectFolder: curIndex:firstVisRow:" +
+                        "curFirstVisRow:curLastVisRow:rowCount - " +
+                        this.mView.selection.currentIndex + ":" +
+                        firstVisRow + ":" +
+                        curFirstVisRow + ":" + curLastVisRow + ":" + this.mView.rowCount);
+
+    return found;
+  },
+
+  /**
+   * Find the feed in the tree.  The search first gets the feed's folder,
+   * then selects the child feed.
+   * 
+   * @param  aFeed {Feed object}    - the feed to find.
+   * @param  [aParentIndex] integer - index to start the folder search.
+   * 
+   * @return found bool - true if found, false if not.
+   */
+  selectFeed: function(aFeed, aParentIndex)
+  {
+    let folder = aFeed.folder;
+    let found = false;
+
+    if (aFeed.folder.isServer) {
+      // If passed the root folder, the caller wants to get the feed's folder
+      // from the db (for cases of an ancestor folder rename/move).
+      let itemResource = FeedUtils.rdf.GetResource(aFeed.url);
+      let ds = FeedUtils.getSubscriptionsDS(aFeed.folder.server);
+      folder = ds.GetTarget(itemResource, FeedUtils.FZ_DESTFOLDER, true);
+    }
+
+    if (this.selectFolder(folder, { parentIndex: aParentIndex }))
+    {
+      let seln = this.mView.selection;
+      let item = this.mView.currentItem;
+      if (item) {
+        for (let i = seln.currentIndex + 1; i < this.mView.rowCount; i++) {
+          if (this.mView.getItemAtIndex(i).url == aFeed.url) {
+            this.mView.selection.select(i);
+            this.mView.treeBox.ensureRowIsVisible(i);
+            found = true;
+            break;
+          }
+        }
+      }
+    }
+
+    return found;
+  },
+
+  updateFeedData: function (aItem)
+  {
+    if (!aItem)
+      return;
+
+    let nameValue = document.getElementById("nameValue");
+    let locationValue = document.getElementById("locationValue");
+    let locationValidate = document.getElementById("locationValidate");
+    let selectFolder = document.getElementById("selectFolder");
+    let selectFolderValue = document.getElementById("selectFolderValue");
+    let isServer = aItem.folder && aItem.folder.isServer;
+    let isFolder = aItem.folder && !aItem.folder.isServer;
+    let isFeed = !aItem.container;
+    let server, displayFolder;
+
+    if (isFeed)
+    {
+      // A feed item.  Set the feed location and title info.
+      nameValue.value = aItem.name;
+      locationValue.value = aItem.url;
+      locationValidate.removeAttribute("collapsed");
+
+      // Root the location picker to the news & blogs server.
+      server = aItem.parentFolder.server;
+      displayFolder = aItem.parentFolder;
+    }
+    else
+    {
+      // A folder/container item.
+      nameValue.value = "";
+      nameValue.disabled = true;
+      locationValue.value = "";
+      locationValidate.setAttribute("collapsed", true);
+
+      server = aItem.folder.server;
+      displayFolder = aItem.folder;
+    }
+
+    // Common to both folder and feed items.
+    nameValue.disabled = aItem.container;
+    this.setFolderPicker(displayFolder, isFeed);
+
+    // Set quick mode value.
+    document.getElementById("quickMode").checked = aItem.quickMode;
+
+    // Autotag items.
+    let autotagEnable = document.getElementById("autotagEnable");
+    let autotagUsePrefix = document.getElementById("autotagUsePrefix");
+    let autotagPrefix = document.getElementById("autotagPrefix");
+    let categoryPrefsAcct = FeedUtils.getOptionsAcct(server).category;
+    if (isServer)
+      aItem.options = FeedUtils.getOptionsAcct(server);
+    let categoryPrefs = aItem.options ? aItem.options.category : null;
+
+    autotagEnable.checked = categoryPrefs && categoryPrefs.enabled;
+    autotagUsePrefix.checked = categoryPrefs && categoryPrefs.prefixEnabled;
+    autotagUsePrefix.disabled = !autotagEnable.checked;
+    autotagPrefix.disabled = autotagUsePrefix.disabled || !autotagUsePrefix.checked;
+    autotagPrefix.value = categoryPrefs && categoryPrefs.prefix ?
+                            categoryPrefs.prefix : "";
+  },
+
+  setFolderPicker: function(aFolder, aIsFeed)
+  {
+    let editFeed = document.getElementById("editFeed");
+    let folderPrettyPath = FeedUtils.getFolderPrettyPath(aFolder);
+    if (!folderPrettyPath)
+      return editFeed.disabled = true;
+
+    let selectFolder = document.getElementById("selectFolder");
+    let selectFolderPopup = document.getElementById("selectFolderPopup");
+    let selectFolderValue = document.getElementById("selectFolderValue");
+
+    selectFolder.setAttribute("hidden", !aIsFeed);
+    selectFolder._folder = aFolder;
+    selectFolderValue.setAttribute("hidden", aIsFeed);
+    selectFolderValue.setAttribute("showfilepath", false);
+
+    if (aIsFeed)
+    {
+      selectFolderPopup._ensureInitialized();
+      selectFolderPopup.selectFolder(aFolder);
+      selectFolder.setAttribute("label", folderPrettyPath);
+      selectFolder.setAttribute("uri", aFolder.URI);
+    }
+    else
+    {
+      selectFolderValue.value = folderPrettyPath;
+      selectFolderValue.setAttribute("prettypath", folderPrettyPath);
+      selectFolderValue.setAttribute("filepath", aFolder.filePath.path);
+    }
+
+    return editFeed.disabled = false;
+  },
+
+  onClickSelectFolderValue: function(aEvent)
+  {
+    let target = aEvent.target;
+    if ((("button" in aEvent) &&
+         (aEvent.button != 0 ||
+          aEvent.originalTarget.localName != "div" ||
+          target.selectionStart != target.selectionEnd)) ||
+        (aEvent.keyCode && aEvent.keyCode != aEvent.DOM_VK_RETURN))
+      return;
+
+    // Toggle between showing prettyPath and absolute filePath.
+    if (target.getAttribute("showfilepath") == "true")
+    {
+      target.setAttribute("showfilepath", false);
+      target.value = target.getAttribute("prettypath");
+    }
+    else
+    {
+      target.setAttribute("showfilepath", true);
+      target.value = target.getAttribute("filepath");
+    }
+  },
+
+  setNewFolder: function(aEvent)
+  {
+    aEvent.stopPropagation();
+    this.setFolderPicker(aEvent.target._folder, true);
+    this.editFeed();
+  },
+
+  setSummary: function(aChecked)
+  {
+    let item = this.mView.currentItem;
+    if (!item || !item.folder)
+      // Not a folder.
+      return;
+
+    if (item.folder.isServer)
+    {
+      if (document.getElementById("locationValue").value)
+        // Intent is to add a feed/folder to the account, so return.
+        return;
+
+      // An account folder.  If it changes, all non feed containing subfolders
+      // need to be updated with the new default.
+      item.folder.server.setBoolValue("quickMode", aChecked);
+      this.FolderListener.folderAdded(item.folder);
+    }
+    else if (!FeedUtils.getFeedUrlsInFolder(item.folder))
+      // Not a folder with feeds.
+      return;
+    else
+    {
+      let feedsInFolder = this.getFeedsInFolder(item.folder);
+      // Update the feeds database, for each feed in the folder.
+      feedsInFolder.forEach(function(feed) { feed.quickMode = aChecked; });
+      // Update the folder's feeds properties in the tree map.
+      item.children.forEach(function(feed) { feed.quickMode = aChecked; });
+      let ds = FeedUtils.getSubscriptionsDS(item.folder.server);
+      ds.Flush();
+    }
+
+    // Update the folder in the tree map.
+    item.quickMode = aChecked;
+    let message = FeedUtils.strings.GetStringFromName("subscribe-feedUpdated");
+    this.updateStatusItem("statusText", message);
+  },
+
+  setCategoryPrefs: function(aNode)
+  {
+    let item = this.mView.currentItem;
+    if (!item)
+      return;
+
+    let isServer = item.folder && item.folder.isServer;
+    let isFolder = item.folder && !item.folder.isServer;
+    let autotagEnable = document.getElementById("autotagEnable");
+    let autotagUsePrefix = document.getElementById("autotagUsePrefix");
+    let autotagPrefix = document.getElementById("autotagPrefix");
+    if (isFolder || (isServer && document.getElementById("locationValue").value))
+    {
+      // Intend to subscribe a feed to a folder, a value must be in the url
+      // field. Update states for addFeed() and return.
+      autotagUsePrefix.disabled = !autotagEnable.checked;
+      autotagPrefix.disabled = autotagUsePrefix.disabled || !autotagUsePrefix.checked;
+      return;
+    }
+
+    switch (aNode.id) {
+      case "autotagEnable":
+        item.options.category.enabled = aNode.checked;
+        break;
+      case "autotagUsePrefix":
+        item.options.category.prefixEnabled = aNode.checked;
+        item.options.category.prefix = autotagPrefix.value;
+        break;
+    }
+
+    if (isServer)
+    {
+      FeedUtils.setOptionsAcct(item.folder.server, item.options)
+    }
+    else
+    {
+      let feedResource = FeedUtils.rdf.GetResource(item.url);
+      let feed = new Feed(feedResource, item.parentFolder.server);
+      feed.options = item.options;
+      let ds = FeedUtils.getSubscriptionsDS(item.parentFolder.server);
+      ds.Flush();
+    }
+
+    this.updateFeedData(item);
+    let message = FeedUtils.strings.GetStringFromName("subscribe-feedUpdated");
+    this.updateStatusItem("statusText", message);
+  },
+
+  onKeyPress: function(aEvent)
+  {
+    if (aEvent.keyCode == aEvent.DOM_VK_DELETE &&
+        aEvent.target.id == "rssSubscriptionsList")
+      this.removeFeed(true);
+
+    this.clearStatusInfo();
+  },
+
+  onSelect: function ()
+  {
+    let item = this.mView.currentItem;
+    this.updateFeedData(item);
+    this.setSummaryFocus();
+    this.updateButtons(item);
+  },
+
+  updateButtons: function (aSelectedItem)
+  {
+    let item = aSelectedItem;
+    let isServer = item && item.folder && item.folder.isServer;
+    let disable = !item || !item.container || isServer ||
+                  this.mActionMode == this.kImportingOPML;
+    document.getElementById("addFeed").disabled = disable;
+    disable = !item || (item.container && !isServer) ||
+              this.mActionMode == this.kImportingOPML;
+    document.getElementById("editFeed").disabled = disable;
+    disable = !item || item.container ||
+              this.mActionMode == this.kImportingOPML;
+    document.getElementById("removeFeed").disabled = disable;
+    disable = !item || !isServer ||
+              this.mActionMode == this.kImportingOPML;
+    document.getElementById("importOPML").disabled = disable;
+    document.getElementById("exportOPML").disabled = disable;
+  },
+
+  onMouseDown: function (aEvent)
+  {
+    if (aEvent.button != 0 ||
+        aEvent.target.id == "validationText" ||
+        aEvent.target.id == "addCertException")
+      return;
+
+    this.clearStatusInfo();
+  },
+
+  setSummaryFocus: function ()
+  {
+    let item = this.mView.currentItem;
+    if (!item)
+      return;
+
+    let locationValue = document.getElementById("locationValue");
+    let quickMode = document.getElementById("quickMode");
+    let autotagEnable = document.getElementById("autotagEnable");
+    let autotagUsePrefix = document.getElementById("autotagUsePrefix");
+    let autotagPrefix = document.getElementById("autotagPrefix");
+    let isServer = item.folder && item.folder.isServer;
+    let isFolder = item.folder && !item.folder.isServer;
+    let isFeed = !item.container;
+
+    // Enable summary/autotag by default.
+    quickMode.disabled = autotagEnable.disabled = false;
+    autotagUsePrefix.disabled = !autotagEnable.checked;
+    autotagPrefix.disabled = autotagUsePrefix.disabled || !autotagUsePrefix.checked;
+
+    if (isServer)
+    {
+      let disable = locationValue.hasAttribute("focused") || locationValue.value;
+      document.getElementById("addFeed").disabled = !disable;
+      document.getElementById("editFeed").disabled = disable;
+
+    }
+    else if (isFolder)
+    {
+      if (!locationValue.hasAttribute("focused") && !locationValue.value)
+      {
+        // Enabled for a folder with feeds. Autotag disabled unless intent is
+        // to add a feed.
+        quickMode.disabled = !FeedUtils.getFeedUrlsInFolder(item.folder);
+        autotagEnable.disabled = autotagUsePrefix.disabled =
+          autotagPrefix.disabled = true;
+      }
+    }
+    else
+    {
+      // Summary is per folder.
+      quickMode.disabled = true;
+    }
+  },
+
+  removeFeed: function (aPrompt)
+  {
+    let seln = this.mView.selection;
+    if (seln.count != 1)
+      return;
+
+    let itemToRemove = this.mView.getItemAtIndex(seln.currentIndex);
+
+    if (!itemToRemove || itemToRemove.container)
+      return;
+
+    if (aPrompt)
+    {
+      // Confirm unsubscribe prompt.
+      let pTitle = FeedUtils.strings.GetStringFromName(
+                     "subscribe-confirmFeedDeletionTitle");
+      let pMessage = FeedUtils.strings.formatStringFromName(
+                       "subscribe-confirmFeedDeletion", [itemToRemove.name], 1);
+      if (Services.prompt.confirmEx(window, pTitle, pMessage,
+                                    Ci.nsIPromptService.STD_YES_NO_BUTTONS,
+                                    null, null, null, null, { }))
+        return;
+    }
+
+    FeedUtils.deleteFeed(FeedUtils.rdf.GetResource(itemToRemove.url),
+                         itemToRemove.parentFolder.server,
+                         itemToRemove.parentFolder);
+
+    // Now that we have removed the feed from the datasource, it is time to
+    // update our view layer.  Update parent folder's quickMode if necessary
+    // and remove the child from its parent folder object.
+    let parentIndex = this.mView.getParentIndex(seln.currentIndex);
+    let parentItem = this.mView.getItemAtIndex(parentIndex);
+    this.updateFolderQuickModeInView(itemToRemove, parentItem, true);
+    this.mView.removeItemAtIndex(seln.currentIndex, false);
+    let message = FeedUtils.strings.GetStringFromName("subscribe-feedRemoved");
+    this.updateStatusItem("statusText", message);
+  },
+
+
+  /**
+   * This addFeed is used by 1) Add button, 1) Update button, 3) Drop of a
+   * feed url on a folder (which can be an add or move).  If Update, the new
+   * url is added and the old removed; thus aParse is false and no new messages
+   * are downloaded, the feed is only validated and stored in the db.  If dnd,
+   * the drop folder is selected and the url is prefilled, so proceed just as
+   * though the url were entered manually.  This allows a user to see the dnd
+   * url better in case of errors.
+   * 
+   * @param  [aFeedLocation] string    - the feed url; get the url from the
+   *                                     input field if null.
+   * @param  [aFolder] nsIMsgFolder    - folder to subscribe, current selected
+   *                                     folder if null.
+   * @param  [aParse] boolean          - if true (default) parse and download
+   *                                     the feed's articles.
+   * @param  [aParams] object          - additional params.
+   * @param  [aMode] integer           - action mode (default is kSubscribeMode)
+   *                                     of the add.
+   * 
+   * @return success boolean           - true if edit checks passed and an
+   *                                     async download has been initiated.
+   */
+  addFeed: function(aFeedLocation, aFolder, aParse, aParams, aMode)
+  {
+    let message;
+    let parse = aParse == null ? true : aParse;
+    let mode = aMode == null ? this.kSubscribeMode : aMode;
+    let locationValue = document.getElementById("locationValue");
+    let quickMode = aParams && ("quickMode" in aParams) ?
+        aParams.quickMode : document.getElementById("quickMode").checked;
+    let name = aParams && ("name" in aParams) ?
+        aParams.name : document.getElementById("nameValue").value;
+    let options = aParams && ("options" in aParams) ?
+        aParams.options : null;
+
+    if (aFeedLocation)
+      locationValue.value = aFeedLocation;
+    let feedLocation = locationValue.value.trim();
+
+    if (!feedLocation)
+    {
+      message = locationValue.getAttribute("placeholder");
+      this.updateStatusItem("statusText", message);
+      return false;
+    }
+
+    if (!FeedUtils.isValidScheme(feedLocation))
+    {
+      message = FeedUtils.strings.GetStringFromName("subscribe-feedNotValid");
+      this.updateStatusItem("statusText", message);
+      return false;
+    }
+
+    let addFolder;
+    if (aFolder)
+    {
+      // For Update or if passed a folder.
+      if (aFolder instanceof Ci.nsIMsgFolder)
+        addFolder = aFolder;
+    }
+    else
+    {
+      // A folder must be selected for Add and Drop.
+      let index = this.mView.selection.currentIndex;
+      let item = this.mView.getItemAtIndex(index);
+      if (item && item.container)
+        addFolder = item.folder;
+    }
+
+    // Shouldn't happen.  Or else not passed an nsIMsgFolder.
+    if (!addFolder)
+      return false;
+
+    // Before we go any further, make sure the user is not already subscribed
+    // to this feed.
+    if (FeedUtils.feedAlreadyExists(feedLocation, addFolder.server))
+    {
+      message = FeedUtils.strings.GetStringFromName(
+                  "subscribe-feedAlreadySubscribed");
+      this.updateStatusItem("statusText", message);
+      return false;
+    }
+
+    if (!options)
+    {
+      // Not passed a param, get values from the ui.
+      options = FeedUtils.optionsTemplate;
+      options.category.enabled = document.getElementById("autotagEnable").checked;
+      options.category.prefixEnabled = document.getElementById("autotagUsePrefix").checked;
+      options.category.prefix = document.getElementById("autotagPrefix").value;
+    }
+
+    let folderURI = addFolder.isServer ? null : addFolder.URI;
+    let feedProperties = { feedName     : name,
+                           feedLocation : feedLocation,
+                           folderURI    : folderURI,
+                           server       : addFolder.server,
+                           quickMode    : quickMode,
+                           options      : options };
+
+    let feed = this.storeFeed(feedProperties);
+    if (!feed)
+      return false;
+
+    // Now validate and start downloading the feed.
+    message = FeedUtils.strings.GetStringFromName("subscribe-validating-feed");
+    this.updateStatusItem("statusText", message);
+    this.updateStatusItem("progressMeter", 0);
+    document.getElementById("addFeed").setAttribute("disabled", true);
+    this.mActionMode = mode;
+    feed.download(parse, this.mFeedDownloadCallback);
+    return true;
+  },
+
+  // Helper routine used by addFeed and importOPMLFile.
+  storeFeed: function(feedProperties)
+  {
+    let itemResource = FeedUtils.rdf.GetResource(feedProperties.feedLocation);
+    let feed = new Feed(itemResource, feedProperties.server);
+
+    // If the user specified a folder to add the feed to, then set it here.
+    if (feedProperties.folderURI)
+    {
+      let folderResource = FeedUtils.rdf.GetResource(feedProperties.folderURI);
+      if (folderResource)
+      {
+        let folder = folderResource.QueryInterface(Ci.nsIMsgFolder);
+        if (folder && !folder.isServer)
+          feed.folder = folder;
+      }
+    }
+
+    feed.title = feedProperties.feedName;
+    feed.quickMode = feedProperties.quickMode;
+    feed.options = feedProperties.options;
+    return feed;
+  },
+
+  updateAccount: function(aItem)
+  {
+    // Check to see if the categoryPrefs custom prefix string value changed.
+    let editAutotagPrefix = document.getElementById("autotagPrefix").value;
+    if (aItem.options.category.prefix != editAutotagPrefix)
+    {
+      aItem.options.category.prefix = editAutotagPrefix;
+      FeedUtils.setOptionsAcct(aItem.folder.server, aItem.options)
+      let message = FeedUtils.strings.GetStringFromName("subscribe-feedUpdated");
+      this.updateStatusItem("statusText", message);
+    }
+  },
+
+  editFeed: function()
+  {
+    let seln = this.mView.selection;
+    if (seln.count != 1)
+      return;
+
+    let itemToEdit = this.mView.getItemAtIndex(seln.currentIndex);
+    if (itemToEdit.folder && itemToEdit.folder.isServer)
+    {
+      this.updateAccount(itemToEdit)
+      return;
+    }
+
+    if (!itemToEdit || itemToEdit.container || !itemToEdit.parentFolder)
+      return;
+
+    let resource = FeedUtils.rdf.GetResource(itemToEdit.url);
+    let currentFolderServer = itemToEdit.parentFolder.server;
+    let ds = FeedUtils.getSubscriptionsDS(currentFolderServer);
+    let currentFolderURI = itemToEdit.parentFolder.URI;
+    let feed = new Feed(resource, currentFolderServer);
+    feed.folder = itemToEdit.parentFolder;
+
+    let editNameValue = document.getElementById("nameValue").value;
+    let editFeedLocation = document.getElementById("locationValue").value.trim();
+    let selectFolder = document.getElementById("selectFolder");
+    let editQuickMode = document.getElementById("quickMode").checked;
+    let editAutotagPrefix = document.getElementById("autotagPrefix").value;
+
+    if (feed.url != editFeedLocation)
+    {
+      // Updating a url.  We need to add the new url and delete the old, to
+      // ensure everything is cleaned up correctly.
+      this.addFeed(null, itemToEdit.parentFolder, false, null, this.kUpdateMode)
+      return;
+    }
+
+    // Did the user change the folder URI for storing the feed?
+    let editFolderURI = selectFolder.getAttribute("uri");
+    if (currentFolderURI != editFolderURI)
+    {
+      // Make sure the new folderpicked folder is visible.
+      this.selectFolder(selectFolder._folder);
+      // Now go back to the feed item.
+      this.selectFeed(feed, null);
+      // We need to find the index of the new parent folder.
+      let newParentIndex = this.mView.kRowIndexUndefined;
+      for (let index = 0; index < this.mView.rowCount; index++)
+      {
+        let item = this.mView.getItemAtIndex(index);
+        if (item && item.container && item.url == editFolderURI)
+        {
+          newParentIndex = index;
+          break;
+        }
+      }
+
+      if (newParentIndex != this.mView.kRowIndexUndefined)
+        this.moveCopyFeed(seln.currentIndex, newParentIndex, "move");
+
+      return;
+    }
+
+    let updated = false;
+    let message = "";
+    // Disable the button until the update completes and we process the async
+    // verify response.
+    document.getElementById("editFeed").setAttribute("disabled", true);
+
+    // Check to see if the title value changed, no blank title allowed.
+    if (feed.title != editNameValue)
+    {
+      if (!editNameValue)
+      {
+        document.getElementById("nameValue").value = feed.title;
+      }
+      else
+      {
+        feed.title = editNameValue;
+        itemToEdit.name = editNameValue;
+        seln.tree.invalidateRow(seln.currentIndex);
+        updated = true;
+      }
+    }
+
+    // Check to see if the quickMode value changed.
+    if (feed.quickMode != editQuickMode)
+    {
+      feed.quickMode = editQuickMode;
+      itemToEdit.quickMode = editQuickMode;
+      updated = true;
+    }
+
+    // Check to see if the categoryPrefs custom prefix string value changed.
+    if (itemToEdit.options.category.prefix != editAutotagPrefix &&
+        itemToEdit.options.category.prefix != null &&
+        editAutotagPrefix != "")
+    {
+      itemToEdit.options.category.prefix = editAutotagPrefix;
+      feed.options = itemToEdit.options;
+      updated = true;
+    }
+
+    let verifyDelay = 0;
+    if (updated) {
+      ds.Flush();
+      message = FeedUtils.strings.GetStringFromName("subscribe-feedUpdated");
+      this.updateStatusItem("statusText", message);
+      verifyDelay = 1500;
+    }
+
+    // Now we want to verify if the stored feed url still works. If it
+    // doesn't, show the error. Delay a bit to leave Updated message visible.
+    message = FeedUtils.strings.GetStringFromName("subscribe-validating-feed");
+    this.mActionMode = this.kVerifyUrlMode;
+    setTimeout(() => {
+      this.updateStatusItem("statusText", message);
+      this.updateStatusItem("progressMeter", "?");
+      feed.download(false, this.mFeedDownloadCallback);
+    }, verifyDelay);
+  },
+
+/**
+ * Moves or copies a feed to another folder or account.
+ * 
+ * @param  int aOldFeedIndex    - index in tree of target feed item.
+ * @param  int aNewParentIndex  - index in tree of target parent folder item.
+ * @param  string aMoveCopy     - either "move" or "copy".
+ */
+  moveCopyFeed: function(aOldFeedIndex, aNewParentIndex, aMoveCopy)
+  {
+    let moveFeed = aMoveCopy == "move";
+    let currentItem = this.mView.getItemAtIndex(aOldFeedIndex);
+    if (!currentItem ||
+        this.mView.getParentIndex(aOldFeedIndex) == aNewParentIndex)
+      // If the new parent is the same as the current parent, then do nothing.
+      return;
+
+    let currentParentIndex = this.mView.getParentIndex(aOldFeedIndex);
+    let currentParentItem = this.mView.getItemAtIndex(currentParentIndex);
+    let currentParentResource = FeedUtils.rdf.GetResource(currentParentItem.url);
+    let currentFolder = currentParentResource.QueryInterface(Ci.nsIMsgFolder);
+
+    let newParentItem = this.mView.getItemAtIndex(aNewParentIndex);
+    let newParentResource = FeedUtils.rdf.GetResource(newParentItem.url);
+    let newFolder = newParentResource.QueryInterface(Ci.nsIMsgFolder);
+
+    let ds = FeedUtils.getSubscriptionsDS(currentItem.parentFolder.server);
+    let resource = FeedUtils.rdf.GetResource(currentItem.url);
+
+    let accountMoveCopy = false;
+    if (currentFolder.rootFolder.URI == newFolder.rootFolder.URI)
+    {
+      // Moving within the same account/feeds db.
+      if (newFolder.isServer || !moveFeed)
+        // No moving to account folder if already in the account; can only move,
+        // not copy, to folder in the same account.
+        return;
+
+      // Unassert the older URI, add an assertion for the new parent URI.
+      ds.Change(resource, FeedUtils.FZ_DESTFOLDER,
+                currentParentResource, newParentResource);
+      ds.Flush();
+
+      // Update folderpane favicons.
+      FeedUtils.setFolderPaneProperty(currentFolder, "favicon", null, "row");
+      FeedUtils.setFolderPaneProperty(newFolder, "favicon", null, "row");
+    }
+    else
+    {
+      // Moving/copying to a new account.  If dropping on the account folder,
+      // a new subfolder is created if necessary.
+      accountMoveCopy = true;
+      let mode = moveFeed ? this.kMoveMode : this.kCopyMode;
+      let params = {quickMode: currentItem.quickMode,
+                    name:      currentItem.name,
+                    options:   currentItem.options};
+      // Subscribe to the new folder first.  If it already exists in the
+      // account or on error, return.
+      if (!this.addFeed(currentItem.url, newFolder, false, params, mode))
+        return;
+      // Unsubscribe the feed from the old folder, if add to the new folder
+      // is successfull, and doing a move.
+      if (moveFeed)
+        FeedUtils.deleteFeed(FeedUtils.rdf.GetResource(currentItem.url),
+                             currentItem.parentFolder.server,
+                             currentItem.parentFolder);
+    }
+
+    // Update local favicons.
+    currentParentItem.favicon = newParentItem.favicon = null;
+
+    // Finally, update our view layer.  Update old parent folder's quickMode
+    // and remove the old row, if move.  Otherwise no change to the view.
+    if (moveFeed)
+    {
+      this.updateFolderQuickModeInView(currentItem, currentParentItem, true);
+      this.mView.removeItemAtIndex(aOldFeedIndex, true);
+      if (aNewParentIndex > aOldFeedIndex)
+        aNewParentIndex--;
+    }
+
+    if (accountMoveCopy)
+    {
+      // If a cross account move/copy, download callback will update the view
+      // with the new location.  Preselect folder/mode for callback.
+      this.selectFolder(newFolder, { parentIndex: aNewParentIndex });
+      return;
+    }
+
+    // Add the new row location to the view.
+    currentItem.level = newParentItem.level + 1;
+    currentItem.parentFolder = newFolder;
+    this.updateFolderQuickModeInView(currentItem, newParentItem, false);
+    newParentItem.children.push(currentItem);
+
+    if (newParentItem.open)
+      // Close the container, selecting the feed will rebuild the view rows.
+      this.mView.toggle(aNewParentIndex);
+
+    this.selectFeed({folder: newParentItem.folder, url: currentItem.url},
+                    aNewParentIndex);
+
+    let message = FeedUtils.strings.GetStringFromName("subscribe-feedMoved");
+    this.updateStatusItem("statusText", message);
+  },
+
+  updateFolderQuickModeInView: function (aFeedItem, aParentItem, aRemove)
+  {
+    let feedItem = aFeedItem;
+    let parentItem = aParentItem;
+    let feedUrlArray = FeedUtils.getFeedUrlsInFolder(feedItem.parentFolder);
+    let feedsInFolder = feedUrlArray ? feedUrlArray.length : 0;
+
+    if (aRemove && feedsInFolder < 1)
+      // Removed only feed in folder; set quickMode to server default.
+      parentItem.quickMode = parentItem.folder.server.getBoolValue("quickMode");
+
+    if (!aRemove)
+    {
+      // Just added a feed to a folder.  If there are already feeds in the
+      // folder, the feed must reflect the parent's quickMode.  If it is the
+      // only feed, update the parent folder to the feed's quickMode.
+      if (feedsInFolder > 1)
+      {
+        let feedResource = FeedUtils.rdf.GetResource(feedItem.url);
+        let feed = new Feed(feedResource, feedItem.parentFolder.server);
+        feed.quickMode = parentItem.quickMode;
+        feedItem.quickMode = parentItem.quickMode;
+      }
+      else
+        parentItem.quickMode = feedItem.quickMode;
+    }
+  },
+
+  onDragStart: function (aEvent)
+  {
+    // Get the selected feed article (if there is one).
+    let seln = this.mView.selection;
+    if (seln.count != 1)
+      return;
+
+    // Only initiate a drag if the item is a feed (ignore folders/containers).
+    let item = this.mView.getItemAtIndex(seln.currentIndex);
+    if (!item || item.container)
+      return;
+
+    aEvent.dataTransfer.setData("text/x-moz-feed-index", seln.currentIndex);
+    aEvent.dataTransfer.effectAllowed = "copyMove";
+  },
+
+  onDragOver: function (aEvent)
+  {
+    this.mView._currentDataTransfer = aEvent.dataTransfer;
+  },
+
+  mFeedDownloadCallback:
+  {
+    mSubscribeMode: true,
+    downloaded: function(feed, aErrorCode)
+    {
+      // Offline check is done in the context of 3pane, return to the subscribe
+      // window once the modal prompt is dispatched.
+      window.focus();
+      // Feed is null if our attempt to parse the feed failed.
+      let message = "";
+      let win = FeedSubscriptions;
+      if (aErrorCode == FeedUtils.kNewsBlogSuccess ||
+          aErrorCode == FeedUtils.kNewsBlogNoNewItems)
+      {
+        win.updateStatusItem("progressMeter", 100);
+
+        if (win.mActionMode == win.kVerifyUrlMode) {
+          // Just checking for errors, if none bye. The (non error) code
+          // kNewsBlogNoNewItems can only happen in verify mode.
+          win.mActionMode = null;
+          win.clearStatusInfo();
+          message = FeedUtils.strings.GetStringFromName("subscribe-feedVerified");
+          win.updateStatusItem("statusText", message);
+          document.getElementById("editFeed").removeAttribute("disabled");
+          return;
+        }
+
+        // Add the feed to the databases.
+        FeedUtils.addFeed(feed);
+
+        // Now add the feed to our view.  If adding, the current selection will
+        // be a folder; if updating it will be a feed.  No need to rebuild the
+        // entire view, that is too jarring.
+        let curIndex = win.mView.selection.currentIndex;
+        let curItem = win.mView.getItemAtIndex(curIndex);
+        if (curItem)
+        {
+          let parentIndex, parentItem, newItem, level;
+          let rows = win.mFeedContainers;
+          if (curItem.container)
+          {
+            // Open the container, if it exists.
+            let folderExists = win.selectFolder(feed.folder,
+                                                { parentIndex: curIndex });
+            if (!folderExists)
+            {
+              // This means a new folder was created.
+              parentIndex = curIndex;
+              parentItem = curItem;
+              level = curItem.level + 1;
+              newItem = win.makeFolderObject(feed.folder, level);
+            }
+            else
+            {
+              // If a folder happens to exist which matches one that would
+              // have been created, the feed system reuses it.  Get the
+              // current item again if reusing a previously unselected folder.
+              curIndex = win.mView.selection.currentIndex;
+              curItem = win.mView.getItemAtIndex(curIndex);
+              parentIndex = curIndex;
+              parentItem = curItem;
+              level = curItem.level + 1;
+              newItem = win.makeFeedObject(feed, feed.folder, level);
+            }
+          }
+          else
+          {
+            // Adding a feed.
+            parentIndex = win.mView.getParentIndex(curIndex);
+            parentItem = win.mView.getItemAtIndex(parentIndex);
+            level = curItem.level;
+            newItem = win.makeFeedObject(feed, feed.folder, level);
+          }
+
+          if (!newItem.container)
+            win.updateFolderQuickModeInView(newItem, parentItem, false);
+          parentItem.children.push(newItem);
+          parentItem.children = win.folderItemSorter(parentItem.children);
+          parentItem.favicon = null;
+
+          if (win.mActionMode == win.kSubscribeMode)
+            message = FeedUtils.strings.GetStringFromName(
+                        "subscribe-feedAdded");
+          if (win.mActionMode == win.kUpdateMode)
+          {
+            win.removeFeed(false);
+            message = FeedUtils.strings.GetStringFromName(
+                        "subscribe-feedUpdated");
+          }
+          if (win.mActionMode == win.kMoveMode)
+            message = FeedUtils.strings.GetStringFromName(
+                        "subscribe-feedMoved");
+          if (win.mActionMode == win.kCopyMode)
+            message = FeedUtils.strings.GetStringFromName(
+                        "subscribe-feedCopied");
+
+          win.selectFeed(feed, parentIndex);
+        }
+      }
+      else
+      {
+        // Non success.  Remove intermediate traces from the feeds database.
+        // But only if we're not in verify mode.
+        if (win.mActionMode != win.kVerifyUrlMode &&
+            feed && feed.url && feed.server)
+          FeedUtils.deleteFeed(FeedUtils.rdf.GetResource(feed.url),
+                               feed.server,
+                               feed.server.rootFolder);
+
+        if (aErrorCode == FeedUtils.kNewsBlogInvalidFeed)
+          message = FeedUtils.strings.GetStringFromName(
+                      "subscribe-feedNotValid");
+        if (aErrorCode == FeedUtils.kNewsBlogRequestFailure)
+          message = FeedUtils.strings.GetStringFromName(
+                      "subscribe-networkError");
+        if (aErrorCode == FeedUtils.kNewsBlogFileError)
+          message = FeedUtils.strings.GetStringFromName(
+                      "subscribe-errorOpeningFile");
+        if (aErrorCode == FeedUtils.kNewsBlogBadCertError) {
+          let host = Services.io.newURI(feed.url, null, null).host;
+          message = FeedUtils.strings.formatStringFromName(
+                      "newsblog-badCertError", [host], 1);
+        }
+        if (aErrorCode == FeedUtils.kNewsBlogNoAuthError)
+          message = FeedUtils.strings.GetStringFromName(
+                      "subscribe-noAuthError");
+
+        if (win.mActionMode != win.kUpdateMode &&
+            win.mActionMode != win.kVerifyUrlMode)
+          // Re-enable the add button if subscribe failed.
+          document.getElementById("addFeed").removeAttribute("disabled");
+        if (win.mActionMode == win.kVerifyUrlMode)
+          // Re-enable the update button if verify failed.
+          document.getElementById("editFeed").removeAttribute("disabled");
+      }
+
+      win.mActionMode = null;
+      win.clearStatusInfo();
+      let code = feed.url.startsWith("http") ? aErrorCode : null;
+      win.updateStatusItem("statusText", message, code);
+    },
+
+    // This gets called after the RSS parser finishes storing a feed item to
+    // disk.  aCurrentFeedItems is an integer corresponding to how many feed
+    // items have been downloaded so far.  aMaxFeedItems is an integer
+    // corresponding to the total number of feed items to download.
+    onFeedItemStored: function (feed, aCurrentFeedItems, aMaxFeedItems)
+    {
+      window.focus();
+      let message = FeedUtils.strings.formatStringFromName(
+                      "subscribe-gettingFeedItems",
+                      [aCurrentFeedItems, aMaxFeedItems], 2);
+      FeedSubscriptions.updateStatusItem("statusText", message);
+      this.onProgress(feed, aCurrentFeedItems, aMaxFeedItems);
+    },
+
+    onProgress: function(feed, aProgress, aProgressMax, aLengthComputable)
+    {
+      FeedSubscriptions.updateStatusItem("progressMeter",
+                                         (aProgress * 100) / aProgressMax);
+    }
+  },
+
+  // Status routines.
+  updateStatusItem: function(aID, aValue, aErrorCode)
+  {
+    let el = document.getElementById(aID);
+    if (el.getAttribute("collapsed"))
+      el.removeAttribute("collapsed");
+
+    if (aID == "progressMeter")
+      el.setAttribute("mode", aValue == "?" ? "undetermined" : "determined");
+
+    if (aID == "statusText")
+      el.textContent = aValue;
+    else
+      el.value = aValue;
+
+    el = document.getElementById("validationText");
+    if (aErrorCode == FeedUtils.kNewsBlogInvalidFeed)
+      el.removeAttribute("collapsed");
+    else
+      el.setAttribute("collapsed", true);
+
+    el = document.getElementById("addCertException");
+    if (aErrorCode == FeedUtils.kNewsBlogBadCertError)
+      el.removeAttribute("collapsed");
+    else
+      el.setAttribute("collapsed", true);
+  },
+
+  clearStatusInfo: function()
+  {
+    document.getElementById("statusText").textContent = "";
+    document.getElementById("progressMeter").collapsed = true;
+    document.getElementById("validationText").collapsed = true;
+    document.getElementById("addCertException").collapsed = true;
+  },
+
+  checkValidation: function(aEvent)
+  {
+    if (aEvent.button != 0)
+      return;
+
+    let validationSite = "http://validator.w3.org";
+    let validationQuery = "http://validator.w3.org/feed/check.cgi?url=";
+
+    if (this.mMainWin)
+    {
+      let tabmail = this.mMainWin.document.getElementById("tabmail");
+      if (tabmail)
+      {
+        let feedLocation = document.getElementById("locationValue").value;
+        let url = validationQuery + encodeURIComponent(feedLocation);
+
+        this.mMainWin.focus();
+        this.mMainWin.openContentTab(url, "tab", "^" + validationSite);
+        FeedUtils.log.debug("checkValidation: query url - " + url);
+      }
+    }
+    aEvent.stopPropagation();
+  },
+
+  addCertExceptionDialog: function()
+  {
+    let feedURL = document.getElementById("locationValue").value.trim();
+    let params = { exceptionAdded : false,
+                   location: feedURL,
+                   prefetchCert: true };
+    window.openDialog("chrome://pippki/content/exceptionDialog.xul",
+                      "", "chrome,centerscreen,modal", params);
+    if (params.exceptionAdded)
+      this.clearStatusInfo();
+  },
+
+  // Listener for folder pane changes.
+  FolderListener: {
+    get feedWindow() {
+      let subscriptionsWindow =
+        Services.wm.getMostRecentWindow("Mail:News-BlogSubscriptions");
+      return subscriptionsWindow ? subscriptionsWindow.FeedSubscriptions : null;
+    },
+
+    get currentSelectedIndex() {
+      return this.feedWindow ? this.feedWindow.mView.selection.currentIndex : -1;
+    },
+
+    get currentSelectedItem() {
+      return this.feedWindow ? this.feedWindow.mView.currentItem : null;
+    },
+
+    folderAdded: function(aFolder)
+    {
+      if (aFolder.server.type != "rss" ||
+          FeedUtils.isInTrash(aFolder))
+        return;
+
+      let parentFolder = aFolder.isServer ? aFolder : aFolder.parent;
+      FeedUtils.log.debug("folderAdded: folder:parent - " + aFolder.name + ":" +
+                          (parentFolder ? parentFolder.filePath.path : "(null)"));
+
+      if (!parentFolder || !this.feedWindow)
+        return;
+
+      let feedWindow = this.feedWindow;
+      let curSelIndex = this.currentSelectedIndex;
+      let curSelItem = this.currentSelectedItem;
+      let firstVisRow = feedWindow.mView.treeBox.getFirstVisibleRow();
+      let indexInView = feedWindow.mView.getItemInViewIndex(parentFolder);
+      let open = indexInView != null;
+
+      if (aFolder.isServer)
+      {
+        if (indexInView != null)
+          // Existing account root folder in the view.
+          open = feedWindow.mView.getItemAtIndex(indexInView).open;
+        else
+        {
+          // Add the account root folder to the view.
+          feedWindow.mFeedContainers.push(feedWindow.makeFolderObject(parentFolder, 0));
+          feedWindow.mView.mRowCount++;
+          feedWindow.mTree.view = feedWindow.mView;
+          feedWindow.mView.treeBox.scrollToRow(firstVisRow);
+          return;
+        }
+      }
+
+      // Rebuild the added folder's parent item in the tree row cache.
+      feedWindow.selectFolder(parentFolder, { select: false,
+                                              open: open,
+                                              newFolder: parentFolder });
+
+      if (indexInView == null || !curSelItem)
+        // Folder isn't in the tree view, no need to update the view.
+        return;
+
+      let parentIndex = feedWindow.mView.getParentIndex(indexInView);
+      if (parentIndex == feedWindow.mView.kRowIndexUndefined)
+        // Root folder is its own parent.
+        parentIndex = indexInView;
+      if (open)
+      {
+        // Close an open parent (or root) folder.
+        feedWindow.mView.toggle(parentIndex);
+        feedWindow.mView.toggleOpenState(parentIndex);
+      }
+      feedWindow.mView.treeBox.scrollToRow(firstVisRow);
+
+      if (curSelItem.container)
+        feedWindow.selectFolder(curSelItem.folder, { open: curSelItem.open });
+      else
+        feedWindow.selectFeed({ folder: curSelItem.parentFolder,
+                                url: curSelItem.url }, parentIndex);
+    },
+
+    folderDeleted: function(aFolder)
+    {
+      if (aFolder.server.type != "rss" || FeedUtils.isInTrash(aFolder))
+        return;
+
+      FeedUtils.log.debug("folderDeleted: folder - " + aFolder.name);
+      if (!this.feedWindow)
+        return;
+
+      let feedWindow = this.feedWindow;
+      let curSelIndex = this.currentSelectedIndex;
+      let indexInView = feedWindow.mView.getItemInViewIndex(aFolder);
+      let open = indexInView != null;
+
+      // Delete the folder from the tree row cache.
+      feedWindow.selectFolder(aFolder, { select: false, open: false, remove: true });
+
+      if (!open || curSelIndex < 0)
+        // Folder isn't in the tree view, no need to update the view.
+        return;
+
+      let select =
+        indexInView == curSelIndex ||
+        feedWindow.mView.isIndexChildOfParentIndex(indexInView, curSelIndex);
+      feedWindow.mView.removeItemAtIndex(indexInView, !select);
+    },
+
+    folderRenamed: function(aOrigFolder, aNewFolder)
+    {
+      if (aNewFolder.server.type != "rss" || FeedUtils.isInTrash(aNewFolder))
+        return;
+
+      FeedUtils.log.debug("folderRenamed: old:new - " +
+                          aOrigFolder.name + ":" + aNewFolder.name);
+      if (!this.feedWindow)
+        return;
+
+      let feedWindow = this.feedWindow;
+      let curSelIndex = this.currentSelectedIndex;
+      let curSelItem = this.currentSelectedItem;
+      let firstVisRow = feedWindow.mView.treeBox.getFirstVisibleRow();
+      let indexInView = feedWindow.mView.getItemInViewIndex(aOrigFolder);
+      let open = indexInView != null;
+
+      // Rebuild the renamed folder's item in the tree row cache.
+      feedWindow.selectFolder(aOrigFolder, { select: false,
+                                             open: open,
+                                             newFolder: aNewFolder });
+
+      if (!open || !curSelItem)
+        // Folder isn't in the tree view, no need to update the view.
+        return;
+
+      let select =
+        indexInView == curSelIndex ||
+        feedWindow.mView.isIndexChildOfParentIndex(indexInView, curSelIndex);
+      let parentIndex = feedWindow.mView.getParentIndex(indexInView);
+      if (parentIndex == feedWindow.mView.kRowIndexUndefined)
+        // Root folder is its own parent.
+        parentIndex = indexInView;
+      feedWindow.mView.toggle(parentIndex);
+      feedWindow.mView.toggleOpenState(parentIndex);
+      feedWindow.mView.treeBox.scrollToRow(firstVisRow);
+
+      if (curSelItem.container) {
+        if (curSelItem.folder == aOrigFolder)
+          feedWindow.selectFolder(aNewFolder, { open: curSelItem.open });
+        else if (select)
+          feedWindow.mView.selection.select(indexInView);
+        else
+          feedWindow.selectFolder(curSelItem.folder, { open: curSelItem.open });
+      }
+      else
+        feedWindow.selectFeed({ folder: curSelItem.parentFolder.rootFolder,
+                                url: curSelItem.url }, parentIndex);
+    },
+
+    folderMoveCopyCompleted: function(aMove, aSrcFolder, aDestFolder)
+    {
+      if (aDestFolder.server.type != "rss")
+        return;
+
+      FeedUtils.log.debug("folderMoveCopyCompleted: move:src:dest - " +
+                          aMove + ":" + aSrcFolder.name + ":" + aDestFolder.name);
+      if (!this.feedWindow)
+        return;
+
+      let feedWindow = this.feedWindow;
+      let curSelIndex = this.currentSelectedIndex;
+      let curSelItem = this.currentSelectedItem;
+      let firstVisRow = feedWindow.mView.treeBox.getFirstVisibleRow();
+      let indexInView = feedWindow.mView.getItemInViewIndex(aSrcFolder);
+      let destIndexInView = feedWindow.mView.getItemInViewIndex(aDestFolder);
+      let open = indexInView != null || destIndexInView != null;
+      let parentIndex = feedWindow.mView.getItemInViewIndex(aDestFolder.parent ||
+                                                            aDestFolder);
+      let select =
+        indexInView == curSelIndex ||
+        feedWindow.mView.isIndexChildOfParentIndex(indexInView, curSelIndex);
+
+      if (aMove)
+      {
+        this.folderDeleted(aSrcFolder);
+        if (aDestFolder.getFlag(Ci.nsMsgFolderFlags.Trash))
+          return;
+      }
+
+      setTimeout(function() {
+        // State on disk needs to settle before a folder object can be rebuilt.
+        feedWindow.selectFolder(aDestFolder, { select: false,
+                                               open: open || select,
+                                               newFolder: aDestFolder });
+
+        if (!open || !curSelItem)
+          // Folder isn't in the tree view, no need to update the view.
+          return;
+
+        feedWindow.mView.toggle(parentIndex);
+        feedWindow.mView.toggleOpenState(parentIndex);
+        feedWindow.mView.treeBox.scrollToRow(firstVisRow);
+
+        if (curSelItem.container) {
+          if (curSelItem.folder == aSrcFolder || select)
+            feedWindow.selectFolder(aDestFolder, { open: true });
+          else
+            feedWindow.selectFolder(curSelItem.folder, { open: curSelItem.open });
+        }
+        else
+          feedWindow.selectFeed({ folder: curSelItem.parentFolder.rootFolder,
+                                  url: curSelItem.url }, null);
+      }, 50);
+    }
+  },
+
+  /* *************************************************************** */
+  /* OPML Functions                                                  */
+  /* *************************************************************** */
+
+  get brandShortName() {
+    let brandBundle = document.getElementById("bundle_brand");
+    return brandBundle ? brandBundle.getString("brandShortName") : "";
+  },
+
+/**
+ * Export feeds as opml file Save As filepicker function.
+ * 
+ * @param  bool aList - if true, exporting as list; if false (default)
+ *                      exporting feeds in folder structure - used for title.
+ * @return nsILocalFile or null.
+ */
+  opmlPickSaveAsFile: function(aList)
+  {
+    let accountName = this.mRSSServer.rootFolder.prettyName;
+    let fileName = FeedUtils.strings.formatStringFromName(
+                     "subscribe-OPMLExportDefaultFileName",
+                     [this.brandShortName, accountName], 2);
+    let title = aList ? FeedUtils.strings.formatStringFromName(
+                          "subscribe-OPMLExportTitleList", [accountName], 1) :
+                        FeedUtils.strings.formatStringFromName(
+                          "subscribe-OPMLExportTitleStruct", [accountName], 1);
+    let fp = Cc["@mozilla.org/filepicker;1"].createInstance(Ci.nsIFilePicker);
+
+    fp.defaultString = fileName;
+    fp.defaultExtension = "opml";
+    if (this.opmlLastSaveAsDir && (this.opmlLastSaveAsDir instanceof Ci.nsILocalFile))
+      fp.displayDirectory = this.opmlLastSaveAsDir;
+
+    let opmlFilterText = FeedUtils.strings.GetStringFromName(
+                           "subscribe-OPMLExportOPMLFilesFilterText");
+    fp.appendFilter(opmlFilterText, "*.opml");
+    fp.appendFilters(Ci.nsIFilePicker.filterAll);
+    fp.filterIndex = 0;
+    fp.init(window, title, Ci.nsIFilePicker.modeSave);
+
+    if (fp.show() != Ci.nsIFilePicker.returnCancel && fp.file)
+    {
+      this.opmlLastSaveAsDir = fp.file.parent;
+      return fp.file;
+    }
+
+    return null;
+  },
+
+/**
+ * Import feeds opml file Open filepicker function.
+ * 
+ * @return nsILocalFile or null.
+ */
+  opmlPickOpenFile: function()
+  {
+    let title = FeedUtils.strings.GetStringFromName("subscribe-OPMLImportTitle");
+    let fp = Cc["@mozilla.org/filepicker;1"].createInstance(Ci.nsIFilePicker);
+
+    fp.defaultString = "";
+    if (this.opmlLastOpenDir && (this.opmlLastOpenDir instanceof Ci.nsILocalFile))
+      fp.displayDirectory = this.opmlLastOpenDir;
+
+    let opmlFilterText = FeedUtils.strings.GetStringFromName(
+                           "subscribe-OPMLExportOPMLFilesFilterText");
+    fp.appendFilter(opmlFilterText, "*.opml");
+    fp.appendFilters(Ci.nsIFilePicker.filterXML);
+    fp.appendFilters(Ci.nsIFilePicker.filterAll);
+    fp.init(window, title, Ci.nsIFilePicker.modeOpen);
+
+    if (fp.show() != Ci.nsIFilePicker.returnCancel && fp.file)
+    {
+      this.opmlLastOpenDir = fp.file.parent;
+      return fp.file;
+    }
+
+    return null;
+  },
+
+  exportOPML: function(aEvent)
+  {
+    // Account folder must be selected.
+    let item = this.mView.currentItem;
+    if (!item || !item.folder || !item.folder.isServer)
+      return;
+
+    this.mRSSServer = item.folder.server;
+    let rootFolder = this.mRSSServer.rootFolder;
+    let exportAsList = aEvent.ctrlKey;
+    let SPACES2 = "  ";
+    let SPACES4 = "    ";
+
+    if (this.mRSSServer.rootFolder.hasSubFolders)
+    {
+      let opmlDoc = document.implementation.createDocument("", "opml", null);
+      let opmlRoot = opmlDoc.documentElement;
+      opmlRoot.setAttribute("version", "1.0");
+      opmlRoot.setAttribute("xmlns:fz", "urn:forumzilla:");
+
+      this.generatePPSpace(opmlRoot, SPACES2);
+
+      // Make the <head> element.
+      let head = opmlDoc.createElement("head");
+      this.generatePPSpace(head, SPACES4);
+      let titleText = FeedUtils.strings.formatStringFromName(
+                        "subscribe-OPMLExportFileDialogTitle",
+                        [this.brandShortName, rootFolder.prettyName], 2);
+      let title = opmlDoc.createElement("title");
+      title.appendChild(opmlDoc.createTextNode(titleText));
+      head.appendChild(title);
+      this.generatePPSpace(head, SPACES4);
+      let dt = opmlDoc.createElement("dateCreated");
+      dt.appendChild(opmlDoc.createTextNode((new Date()).toUTCString()));
+      head.appendChild(dt);
+      this.generatePPSpace(head, SPACES2);
+      opmlRoot.appendChild(head);
+
+      this.generatePPSpace(opmlRoot, SPACES2);
+
+      // Add <outline>s to the <body>.
+      let body = opmlDoc.createElement("body");
+      if (exportAsList)
+        this.generateOutlineList(rootFolder, body, SPACES4.length + 2);
+      else
+        this.generateOutlineStruct(rootFolder, body, SPACES4.length);
+
+      this.generatePPSpace(body, SPACES2);
+
+      if (!body.childElementCount)
+        // No folders/feeds.
+        return;
+
+      opmlRoot.appendChild(body);
+      this.generatePPSpace(opmlRoot, "");
+
+      let serializer = new XMLSerializer();
+
+      if (FeedUtils.log.level <= Log4Moz.Level.Debug)
+        FeedUtils.log.debug("exportOPML: opmlDoc -\n" +
+                            serializer.serializeToString(opmlDoc) + "\n");
+
+      // Get file to save from filepicker.
+      let saveAsFile = this.opmlPickSaveAsFile(exportAsList);
+      if (!saveAsFile)
+        return;
+
+      let fos = FileUtils.openSafeFileOutputStream(saveAsFile);
+      serializer.serializeToStream(opmlDoc, fos, "utf-8");
+      FileUtils.closeSafeFileOutputStream(fos);
+
+      let statusReport = FeedUtils.strings.formatStringFromName(
+                           "subscribe-OPMLExportDone", [saveAsFile.path], 1);
+      this.updateStatusItem("statusText", statusReport);
+    }
+  },
+
+  generatePPSpace: function(aNode, indentString)
+  {
+    aNode.appendChild(aNode.ownerDocument.createTextNode("\n"));
+    aNode.appendChild(aNode.ownerDocument.createTextNode(indentString));
+  },
+
+  generateOutlineList: function(baseFolder, parent, indentLevel)
+  {
+    // Pretty printing.
+    let indentString = " ".repeat(indentLevel - 2);
+
+    let feedOutline;
+    let folderEnumerator = baseFolder.subFolders;
+    while (folderEnumerator.hasMoreElements())
+    {
+      let folder = folderEnumerator.getNext().QueryInterface(Ci.nsIMsgFolder);
+      FeedUtils.log.debug("generateOutlineList: folder - " +
+                          folder.filePath.path);
+      if (!(folder instanceof Ci.nsIMsgFolder) ||
+          folder.getFlag(Ci.nsMsgFolderFlags.Trash) ||
+          folder.getFlag(Ci.nsMsgFolderFlags.Virtual))
+        continue;
+
+      FeedUtils.log.debug("generateOutlineList: CONTINUE folderName - " +
+                          folder.name);
+
+      if (folder.hasSubFolders)
+      {
+        FeedUtils.log.debug("generateOutlineList: has subfolders - " +
+                            folder.name);
+        // Recurse.
+        this.generateOutlineList(folder, parent, indentLevel);
+      }
+
+      // Add outline elements with xmlUrls.
+      let feeds = this.getFeedsInFolder(folder);
+      for (let feed of feeds)
+      {
+        FeedUtils.log.debug("generateOutlineList: folder has FEED url - " +
+                            folder.name + " : " + feed.url);
+        feedOutline = this.exportOPMLOutline(feed, parent.ownerDocument);
+        this.generatePPSpace(parent, indentString);
+        parent.appendChild(feedOutline);
+      }
+    }
+  },
+
+  generateOutlineStruct: function(baseFolder, parent, indentLevel)
+  {
+    // Pretty printing.
+    function indentString(len) { return " ".repeat(len - 2); };
+
+    let folderOutline, feedOutline;
+    let folderEnumerator = baseFolder.subFolders;
+    while (folderEnumerator.hasMoreElements())
+    {
+      let folder = folderEnumerator.getNext().QueryInterface(Ci.nsIMsgFolder);
+      FeedUtils.log.debug("generateOutlineStruct: folder - " +
+                          folder.filePath.path);
+      if (!(folder instanceof Ci.nsIMsgFolder) ||
+          folder.getFlag(Ci.nsMsgFolderFlags.Trash) ||
+          folder.getFlag(Ci.nsMsgFolderFlags.Virtual))
+        continue;
+
+      FeedUtils.log.debug("generateOutlineStruct: CONTINUE folderName - " +
+                          folder.name);
+
+      // Make a folder outline element.
+      folderOutline = parent.ownerDocument.createElement("outline");
+      folderOutline.setAttribute("title", folder.prettyName);
+      this.generatePPSpace(parent, indentString(indentLevel + 2));
+
+      if (folder.hasSubFolders)
+      {
+        FeedUtils.log.debug("generateOutlineStruct: has subfolders - " +
+                            folder.name);
+        // Recurse.
+        this.generateOutlineStruct(folder, folderOutline, indentLevel + 2);
+      }
+
+      let feeds = this.getFeedsInFolder(folder);
+      for (let feed of feeds)
+      {
+        // Add feed outline elements with xmlUrls.
+        FeedUtils.log.debug("generateOutlineStruct: folder has FEED url - "+
+                            folder.name + " : " + feed.url);
+        feedOutline = this.exportOPMLOutline(feed, parent.ownerDocument);
+        this.generatePPSpace(folderOutline, indentString(indentLevel + 4));
+        folderOutline.appendChild(feedOutline);
+      }
+
+      parent.appendChild(folderOutline);
+    }
+  },
+
+  exportOPMLOutline: function(aFeed, aDoc)
+  {
+    let outRv = aDoc.createElement("outline");
+    outRv.setAttribute("type", "rss");
+    outRv.setAttribute("title", aFeed.title);
+    outRv.setAttribute("text", aFeed.title);
+    outRv.setAttribute("version", "RSS");
+    outRv.setAttribute("fz:quickMode", aFeed.quickMode);
+    outRv.setAttribute("fz:options", JSON.stringify(aFeed.options));
+    outRv.setAttribute("xmlUrl", aFeed.url);
+    outRv.setAttribute("htmlUrl", aFeed.link);
+    return outRv;
+  },
+
+  importOPML: function()
+  {
+    // Account folder must be selected in subscribe dialog.
+    let item = this.mView ? this.mView.currentItem : null;
+    if (!item || !item.folder || !item.folder.isServer)
+      return;
+
+    let server = item.folder.server;
+    // Get file to open from filepicker.
+    let openFile = this.opmlPickOpenFile();
+    if (!openFile)
+      return;
+
+    this.mActionMode = this.kImportingOPML;
+    this.updateButtons(null);
+    this.selectFolder(item.folder, { select: false, open: true });
+    let statusReport = FeedUtils.strings.GetStringFromName("subscribe-loading");
+    this.updateStatusItem("statusText", statusReport);
+    // If there were a getElementsByAttribute in html, we could go determined...
+    this.updateStatusItem("progressMeter", "?");
+
+    if (!this.importOPMLFile(openFile, server, this.importOPMLFinished)) {
+      this.mActionMode = null;
+      this.updateButtons(item);
+      this.clearStatusInfo();
+    }
+  },
+
+/**
+ * Import opml file into a feed account.  Used by the Subscribe dialog and
+ * the Import wizard.
+ * 
+ * @param  nsILocalFile aFile           - the opml file.
+ * @param  nsIMsgIncomingServer aServer - the account server.
+ * @param  func aCallback               - callback function.
+ * 
+ * @return bool                         - false if error.
+ */
+  importOPMLFile: function(aFile, aServer, aCallback)
+  {
+    if (aServer && (aServer instanceof Ci.nsIMsgIncomingServer))
+      this.mRSSServer = aServer;
+
+    if (!aFile || !this.mRSSServer || !aCallback)
+      return false;
+
+    let opmlDom, statusReport;
+    let stream = Cc["@mozilla.org/network/file-input-stream;1"].
+                 createInstance(Ci.nsIFileInputStream);
+
+    // Read in file as raw bytes, so Expat can do the decoding for us.
+    try {
+      stream.init(aFile, FileUtils.MODE_RDONLY, FileUtils.PERMS_FILE, 0);
+      let parser = new DOMParser();
+      opmlDom = parser.parseFromStream(stream, null, stream.available(),
+                                       "application/xml");
+    }
+    catch(e) {
+      statusReport = FeedUtils.strings.GetStringFromName(
+                       "subscribe-errorOpeningFile");
+      Services.prompt.alert(window, null, statusReport);
+      return false;
+    }
+    finally {
+      stream.close();
+    }
+
+    let body = opmlDom ? opmlDom.querySelector("body") : null;
+
+    // Return if the OPML file is invalid or empty.
+    if (!body || !body.childElementCount ||
+      opmlDom.documentElement.tagName != "opml")
+    {
+      statusReport = FeedUtils.strings.formatStringFromName(
+                       "subscribe-OPMLImportInvalidFile", [aFile.leafName], 1);
+      Services.prompt.alert(window, null, statusReport);
+      return false;
+    }
+
+    this.importOPMLOutlines(body, this.mRSSServer, aCallback);
+    return true;
+  },
+
+  importOPMLOutlines: function(aBody, aRSSServer, aCallback)
+  {
+    let win = this;
+    let rssServer = aRSSServer;
+    let callback = aCallback;
+    let outline, feedFolder;
+    let badTag = false;
+    let firstFeedInFolderQuickMode = null;
+    let lastFolder;
+    let feedsAdded = 0;
+    let rssOutlines = 0;
+    let folderOutlines = 0;
+
+    function processor(aParentNode, aParentFolder)
+    {
+      FeedUtils.log.trace("importOPMLOutlines: PROCESSOR tag:name:childs - " +
+                          aParentNode.tagName + ":" +
+                          aParentNode.getAttribute("text") + ":" +
+                          aParentNode.childElementCount);
+      while (true)
+      {
+        if (aParentNode.tagName == "body" && !aParentNode.childElementCount)
+        {
+          // Finished.
+          let statusReport = win.importOPMLStatus(feedsAdded, rssOutlines);
+          callback(statusReport, lastFolder, win);
+          return;
+        }
+
+        outline = aParentNode.firstElementChild;
+        if (outline.tagName != "outline")
+        {
+          FeedUtils.log.info("importOPMLOutlines: skipping, node is not an " +
+                             "<outline> - <" + outline.tagName + ">");
+          badTag = true;
+          break;
+        }
+
+        let outlineName = outline.getAttribute("text") ||
+                          outline.getAttribute("title") ||
+                          outline.getAttribute("xmlUrl");
+        let feedUrl, folderURI;
+
+        if (outline.getAttribute("type") == "rss")
+        {
+          // A feed outline.
+          feedUrl = outline.getAttribute("xmlUrl") || outline.getAttribute("url");
+          if (!feedUrl)
+          {
+            FeedUtils.log.info("importOPMLOutlines: skipping, type=rss <outline> " +
+                               "has no url - " + outlineName);
+            break;
+          }
+
+          rssOutlines++;
+          feedFolder = aParentFolder;
+
+          if (FeedUtils.feedAlreadyExists(feedUrl, rssServer))
+          {
+            FeedUtils.log.info("importOPMLOutlines: feed already subscribed in account " +
+                               rssServer.prettyName + ", url - " + feedUrl);
+            break;
+          }
+
+          if (aParentNode.tagName == "outline" &&
+              aParentNode.getAttribute("type") != "rss")
+            // Parent is a folder, already created.
+            folderURI = feedFolder.URI;
+          else
+          {
+            // Parent is not a folder outline, likely the <body> in a flat list.
+            // Create feed's folder with feed's name and account rootFolder as
+            // parent of feed's folder.
+            // NOTE: Assume a type=rss outline must be a leaf and is not a
+            // direct parent of another type=rss outline; such a structure
+            // may lead to unintended nesting and inaccurate counts.
+          }
+
+          // Create the feed.
+          let quickMode = outline.hasAttribute("fz:quickMode") ?
+                            outline.getAttribute("fz:quickMode") == "true" :
+                            rssServer.getBoolValue("quickMode");
+          let options = outline.getAttribute("fz:options");
+          options = options ? JSON.parse(options) : null;
+
+          if (firstFeedInFolderQuickMode === null)
+            // The summary/web page pref applies to all feeds in a folder,
+            // though it is a property of an individual feed.  This can be
+            // set (and is obvious) in the subscribe dialog; ensure import
+            // doesn't leave mismatches if mismatched in the opml file.
+            firstFeedInFolderQuickMode = quickMode;
+          else
+            quickMode = firstFeedInFolderQuickMode;
+
+          let feedProperties = { feedName     : outlineName,
+                                 feedLocation : feedUrl,
+                                 server       : rssServer,
+                                 folderURI    : folderURI,
+                                 quickMode    : quickMode,
+                                 options      : options };
+
+          FeedUtils.log.info("importOPMLOutlines: importing feed: name, url - "+
+                             outlineName + ", " + feedUrl);
+
+          let feed = win.storeFeed(feedProperties);
+          if (outline.hasAttribute("htmlUrl"))
+            feed.link = outline.getAttribute("htmlUrl");
+
+          feed.createFolder();
+          if (!feed.folder)
+          {
+            // Non success. Remove intermediate traces from the feeds database.
+            if (feed && feed.url && feed.server)
+              FeedUtils.deleteFeed(FeedUtils.rdf.GetResource(feed.url),
+                                   feed.server,
+                                   feed.server.rootFolder);
+            FeedUtils.log.info("importOPMLOutlines: skipping, error creating folder - '" +
+                               feed.folderName + "' from outlineName - '" +
+                               outlineName + "' in parent folder " +
+                               aParentFolder.filePath.path);
+            badTag = true;
+            break;
+          }
+
+          // Add the feed to the databases.
+          FeedUtils.addFeed(feed);
+          // Feed correctly added.
+          feedsAdded++;
+          lastFolder = feed.folder;
+        }
+        else
+        {
+          // A folder outline. If a folder exists in the account structure at
+          // the same level as in the opml structure, feeds are placed into the
+          // existing folder.
+          let defaultName = FeedUtils.strings.GetStringFromName("ImportFeedsNew");
+          let folderName = FeedUtils.getSanitizedFolderName(aParentFolder,
+                                                            outlineName,
+                                                            defaultName,
+                                                            false);
+          try {
+            feedFolder = aParentFolder.getChildNamed(folderName);
+          }
+          catch (ex) {
+            // Folder not found, create it.
+            FeedUtils.log.info("importOPMLOutlines: creating folder - '" +
+                                folderName + "' from outlineName - '" +
+                                outlineName + "' in parent folder " +
+                                aParentFolder.filePath.path);
+            firstFeedInFolderQuickMode = null;
+            try {
+              feedFolder = aParentFolder.QueryInterface(Ci.nsIMsgLocalMailFolder).
+                                         createLocalSubfolder(folderName);
+              folderOutlines++;
+            }
+            catch (ex) {
+              // An error creating. Skip it.
+              FeedUtils.log.info("importOPMLOutlines: skipping, error creating folder - '" +
+                                  folderName + "' from outlineName - '" +
+                                  outlineName + "' in parent folder " +
+                                  aParentFolder.filePath.path);
+              let xfolder = aParentFolder.getChildNamed(folderName);
+              aParentFolder.propagateDelete(xfolder, true, null);
+              badTag = true;
+              break;
+            }
+          }
+        }
+        break;
+      }
+
+      if (!outline.childElementCount || badTag)
+      {
+        // Remove leaf nodes that are processed or bad tags from the opml dom,
+        // and go back to reparse.  This method lets us use setTimeout to
+        // prevent UI hang, in situations of both deep and shallow trees.
+        // A yield/generator.next() method is fine for shallow trees, but not
+        // the true recursion required for deeper trees; both the shallow loop
+        // and the recurse should give it up.
+        outline.remove();
+        badTag = false;
+        outline = aBody;
+        feedFolder = rssServer.rootFolder;
+      }
+
+      setTimeout(function() {
+        processor(outline, feedFolder);
+      }, 0);
+    }
+
+    processor(aBody, rssServer.rootFolder);
+  },
+
+  importOPMLStatus: function(aFeedsAdded, aRssOutlines, aFolderOutlines)
+  {
+    let statusReport;
+    if (aRssOutlines > aFeedsAdded)
+      statusReport = FeedUtils.strings.formatStringFromName("subscribe-OPMLImportStatus",
+        [PluralForm.get(aFeedsAdded,
+                        FeedUtils.strings.GetStringFromName("subscribe-OPMLImportUniqueFeeds"))
+                   .replace("#1", aFeedsAdded),
+         PluralForm.get(aRssOutlines,
+                        FeedUtils.strings.GetStringFromName("subscribe-OPMLImportFoundFeeds"))
+                   .replace("#1", aRssOutlines)], 2);
+    else
+      statusReport = PluralForm.get(aFeedsAdded,
+        FeedUtils.strings.GetStringFromName("subscribe-OPMLImportFeedCount"))
+                         .replace("#1", aFeedsAdded);
+
+    return statusReport;
+  },
+
+  importOPMLFinished: function(aStatusReport, aLastFolder, aWin)
+  {
+    if (aLastFolder)
+    {
+      aWin.selectFolder(aLastFolder, { select: false, newFolder: aLastFolder });
+      aWin.selectFolder(aLastFolder.parent);
+    }
+    aWin.mActionMode = null;
+    aWin.updateButtons(aWin.mView.currentItem);
+    aWin.clearStatusInfo();
+    aWin.updateStatusItem("statusText", aStatusReport);
+  }
+
+};
diff --git a/mailnews/extensions/newsblog/content/feed-subscriptions.xul b/mailnews/extensions/newsblog/content/feed-subscriptions.xul
new file mode 100644
index 000000000..d6f4ea18f
--- /dev/null
+++ b/mailnews/extensions/newsblog/content/feed-subscriptions.xul
@@ -0,0 +1,235 @@
+<?xml version="1.0"?>
+<!-- -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+   - This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<?xml-stylesheet href="chrome://messenger/skin/" type="text/css"?>
+<?xml-stylesheet href="chrome://messenger/skin/folderPane.css" type="text/css"?>
+<?xml-stylesheet href="chrome://messenger/skin/folderMenus.css" type="text/css"?>
+<?xml-stylesheet href="chrome://messenger-newsblog/skin/feed-subscriptions.css" type="text/css"?>
+
+<!DOCTYPE window [
+  <!ENTITY % feedDTD SYSTEM "chrome://messenger-newsblog/locale/feed-subscriptions.dtd">
+    %feedDTD;
+  <!ENTITY % certDTD SYSTEM "chrome://pippki/locale/certManager.dtd">
+    %certDTD;
+]>
+
+<window id="subscriptionsDialog"
+        flex="1"
+        title="&feedSubscriptions.label;"
+        windowtype="Mail:News-BlogSubscriptions"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+        xmlns:nc="http://home.netscape.com/NC-rdf#"
+        persist="width height screenX screenY sizemode"
+        onload="FeedSubscriptions.onLoad();"
+        onclose="return FeedSubscriptions.onClose();"
+        onkeypress="FeedSubscriptions.onKeyPress(event);"
+        onmousedown="FeedSubscriptions.onMouseDown(event);">
+
+  <script type="application/javascript"
+          src="chrome://messenger/content/specialTabs.js"/>
+  <script type="application/javascript"
+          src="chrome://messenger-newsblog/content/feed-subscriptions.js"/>
+
+  <keyset id="extensionsKeys">
+    <key id="key_close"
+         key="&cmd.close.commandKey;"
+         modifiers="accel"
+         oncommand="window.close();"/>
+    <key id="key_close2"
+         keycode="VK_ESCAPE"
+         oncommand="window.close();"/>
+  </keyset>
+
+  <stringbundle id="bundle_newsblog"
+                src="chrome://messenger-newsblog/locale/newsblog.properties"/>
+  <stringbundle id="bundle_brand"
+                src="chrome://branding/locale/brand.properties"/>
+
+  <vbox flex="1" id="contentPane">
+    <hbox align="right">
+      <label id="learnMore"
+             class="text-link"
+             crop="end"
+             value="&learnMore.label;"
+             href="https://support.mozilla.org/kb/how-subscribe-news-feeds-and-blogs"/>
+    </hbox>
+
+    <tree id="rssSubscriptionsList"
+          treelines="true"
+          flex="1"
+          hidecolumnpicker="true"
+          onselect="FeedSubscriptions.onSelect();"
+          seltype="single">
+      <treecols>
+        <treecol id="folderNameCol"
+                 flex="2"
+                 primary="true"
+                 hideheader="true"/>
+      </treecols>
+      <treechildren id="subscriptionChildren"
+                    ondragstart="FeedSubscriptions.onDragStart(event);"
+                    ondragover="FeedSubscriptions.onDragOver(event);"/>
+    </tree>
+
+    <hbox id="rssFeedInfoBox">
+      <vbox flex="1">
+        <grid flex="1">
+          <columns>
+            <column/>
+            <column flex="1"/>
+          </columns>
+          <rows>
+            <row>
+              <hbox align="right" valign="middle">
+                <label id="nameLabel"
+                       accesskey="&feedTitle.accesskey;"
+                       control="nameValue"
+                       value="&feedTitle.label;"/>
+              </hbox>
+              <textbox id="nameValue"
+                       clickSelectsAll="true"/>
+            </row>
+            <row>
+              <hbox align="right" valign="middle">
+                <label id="locationLabel"
+                       accesskey="&feedLocation.accesskey;"
+                       control="locationValue"
+                       value="&feedLocation.label;"/>
+              </hbox>
+              <hbox>
+                <textbox id="locationValue"
+                         flex="1"
+                         class="uri-element"
+                         placeholder="&feedLocation.placeholder;"
+                         clickSelectsAll="true"
+                         onfocus="FeedSubscriptions.setSummaryFocus();"
+                         onblur="FeedSubscriptions.setSummaryFocus();"/>
+                <hbox align="center">
+                  <label id="locationValidate"
+                         collapsed="true"
+                         class="text-link"
+                         crop="end"
+                         value="&locationValidate.label;"
+                         onclick="FeedSubscriptions.checkValidation(event);"/>
+                </hbox>
+              </hbox>
+            </row>
+            <row>
+              <hbox align="right" valign="middle">
+                <label id="feedFolderLabel"
+                       value="&feedFolder.label;"
+                       accesskey="&feedFolder.accesskey;"
+                       control="selectFolder"/>
+              </hbox>
+              <hbox>
+                <menulist id="selectFolder"
+                          flex="1"
+                          class="folderMenuItem"
+                          hidden="true">
+                  <menupopup id="selectFolderPopup"
+                             class="menulist-menupopup"
+                             type="folder"
+                             mode="feeds"
+                             showFileHereLabel="true"
+                             showAccountsFileHere="true"
+                             oncommand="FeedSubscriptions.setNewFolder(event)"/>
+                </menulist>
+                <textbox id="selectFolderValue"
+                         flex="1"
+                         readonly="true"
+                         onkeypress="FeedSubscriptions.onClickSelectFolderValue(event)"
+                         onclick="FeedSubscriptions.onClickSelectFolderValue(event)"/>
+              </hbox>
+            </row>
+          </rows>
+        </grid>
+        <checkbox id="quickMode"
+                  accesskey="&quickMode.accesskey;"
+                  label="&quickMode.label;"
+                  oncommand="FeedSubscriptions.setSummary(this.checked)"/>
+        <checkbox id="autotagEnable"
+                  accesskey="&autotagEnable.accesskey;"
+                  label="&autotagEnable.label;"
+                  oncommand="FeedSubscriptions.setCategoryPrefs(this)"/>
+        <hbox>
+            <checkbox id="autotagUsePrefix"
+                      class="indent"
+                      accesskey="&autotagUsePrefix.accesskey;"
+                      label="&autotagUsePrefix.label;"
+                      oncommand="FeedSubscriptions.setCategoryPrefs(this)"/>
+            <textbox id="autotagPrefix"
+                     placeholder="&autoTagPrefix.placeholder;"
+                     clickSelectsAll="true"/>
+        </hbox>
+        <separator class="thin"/>
+      </vbox>
+    </hbox>
+
+    <hbox id="statusContainerBox"
+          align="center"
+          valign="middle">
+      <vbox flex="1">
+        <description id="statusText"/>
+      </vbox>
+      <spacer flex="1"/>
+      <label id="validationText"
+             collapsed="true"
+             class="text-link"
+             crop="end"
+             value="&validateText.label;"
+             onclick="FeedSubscriptions.checkValidation(event);"/>
+      <button id="addCertException"
+              collapsed="true"
+              label="&certmgr.addException.label;"
+              accesskey="&certmgr.addException.accesskey;"
+              oncommand="FeedSubscriptions.addCertExceptionDialog();"/>
+      <progressmeter id="progressMeter"
+                     collapsed="true"
+                     mode="determined"
+                     value="0"/>
+    </hbox>
+
+    <hbox align="end">
+      <hbox class="actionButtons" flex="1">
+        <button id="addFeed"
+                label="&button.addFeed.label;"
+                accesskey="&button.addFeed.accesskey;"
+                oncommand="FeedSubscriptions.addFeed();"/>
+
+        <button id="editFeed"
+                disabled="true"
+                label="&button.updateFeed.label;"
+                accesskey="&button.updateFeed.accesskey;"
+                oncommand="FeedSubscriptions.editFeed();"/>
+
+        <button id="removeFeed"
+                disabled="true"
+                label="&button.removeFeed.label;"
+                accesskey="&button.removeFeed.accesskey;"
+                oncommand="FeedSubscriptions.removeFeed(true);"/>
+
+        <button id="importOPML"
+                label="&button.importOPML.label;"
+                accesskey="&button.importOPML.accesskey;"
+                oncommand="FeedSubscriptions.importOPML();"/>
+
+        <button id="exportOPML"
+                label="&button.exportOPML.label;"
+                accesskey="&button.exportOPML.accesskey;"
+                tooltiptext="&button.exportOPML.tooltip;"
+                oncommand="FeedSubscriptions.exportOPML(event);"/>
+
+        <spacer flex="1"/>
+
+        <button id="close"
+                label="&button.close.label;"
+                icon="close"
+                oncommand="if (FeedSubscriptions.onClose()) window.close();"/>
+      </hbox>
+    </hbox>
+  </vbox>
+</window>
diff --git a/mailnews/extensions/newsblog/content/feedAccountWizard.js b/mailnews/extensions/newsblog/content/feedAccountWizard.js
new file mode 100644
index 000000000..a79da073a
--- /dev/null
+++ b/mailnews/extensions/newsblog/content/feedAccountWizard.js
@@ -0,0 +1,45 @@
+/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

+/* This Source Code Form is subject to the terms of the Mozilla Public

+ * License, v. 2.0. If a copy of the MPL was not distributed with this

+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

+

+Components.utils.import("resource:///modules/FeedUtils.jsm");

+

+/* Feed account standalone wizard functions */

+var FeedAccountWizard = {

+  accountName: "",

+

+  accountSetupPageInit: function() {

+    this.accountSetupPageValidate();

+  },

+

+  accountSetupPageValidate: function() {

+    this.accountName = document.getElementById("prettyName").value.trim();

+    document.documentElement.canAdvance = this.accountName;

+  },

+

+  accountSetupPageUnload: function() {

+    return;

+  },

+

+  donePageInit: function() {

+    document.getElementById("account.name.text").value = this.accountName;

+  },

+

+  onCancel: function() {

+    return true;

+  },

+

+  onFinish: function() {

+    let account = FeedUtils.createRssAccount(this.accountName);

+    if ("gFolderTreeView" in window.opener.top)

+      // Opened from 3pane File->New or Appmenu New Message, or

+      // Account Central link.

+      window.opener.top.gFolderTreeView.selectFolder(account.incomingServer.rootMsgFolder);

+    else if ("selectServer" in window.opener)

+      // Opened from Account Settings.

+      window.opener.selectServer(account.incomingServer);

+

+    window.close();

+  }

+}

diff --git a/mailnews/extensions/newsblog/content/feedAccountWizard.xul b/mailnews/extensions/newsblog/content/feedAccountWizard.xul
new file mode 100644
index 000000000..0535fb237
--- /dev/null
+++ b/mailnews/extensions/newsblog/content/feedAccountWizard.xul
@@ -0,0 +1,79 @@
+<?xml version="1.0"?>

+<!-- This Source Code Form is subject to the terms of the Mozilla Public

+   - License, v. 2.0. If a copy of the MPL was not distributed with this

+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->

+

+<?xml-stylesheet href="chrome://messenger/skin/accountWizard.css" type="text/css"?>

+

+<!DOCTYPE wizard [

+  <!ENTITY %  accountDTD SYSTEM "chrome://messenger/locale/AccountWizard.dtd">

+  %accountDTD;

+  <!ENTITY % newsblogDTD SYSTEM "chrome://messenger-newsblog/locale/am-newsblog.dtd" >

+  %newsblogDTD;

+  <!ENTITY %       imDTD SYSTEM "chrome://messenger/locale/imAccountWizard.dtd" >

+  %imDTD;

+]>

+

+<wizard id="FeedAccountWizard"

+        title="&feedWindowTitle.label;"

+        onwizardcancel="return FeedAccountWizard.onCancel();"

+        onwizardfinish="return FeedAccountWizard.onFinish();"

+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

+

+  <script type="application/javascript"

+          src="chrome://messenger-newsblog/content/feedAccountWizard.js"/>

+

+  <!-- Account setup page : User gets a choice to enter a name for the account -->

+  <!-- Defaults : Feed account name -> default string -->

+  <wizardpage id="accountsetuppage"

+              pageid="accountsetuppage"

+              label="&accnameTitle.label;"

+              onpageshow="return FeedAccountWizard.accountSetupPageInit();"

+              onpageadvanced="return FeedAccountWizard.accountSetupPageUnload();">

+    <vbox flex="1">

+      <description>&accnameDesc.label;</description>

+      <separator class="thin"/>

+      <hbox align="center">

+        <label class="label"

+               value="&accnameLabel.label;"

+               accesskey="&accnameLabel.accesskey;"

+               control="prettyName"/>

+        <textbox id="prettyName"

+                 flex="1"

+                 value="&feeds.accountName;"

+                 oninput="FeedAccountWizard.accountSetupPageValidate();"/>

+      </hbox>

+    </vbox>

+  </wizardpage>

+

+  <!-- Done page : Summarizes information collected to create a feed account -->

+  <wizardpage id="done"

+              pageid="done"

+              label="&accountSummaryTitle.label;"

+              onpageshow="return FeedAccountWizard.donePageInit();">

+    <vbox flex="1">

+      <description>&accountSummaryInfo.label;</description>

+      <separator class="thin"/>

+      <grid>

+        <columns>

+          <column/>

+          <column flex="1"/>

+        </columns>

+        <rows>

+          <row id="account.name"

+               align="center">

+            <label id="account.name.label"

+                   class="label"

+                   flex="1"

+                   value="&accnameLabel.label;"/>

+            <label id="account.name.text"

+                   class="label"/>

+          </row>

+        </rows>

+      </grid>

+      <separator/>

+      <spacer flex="1"/>

+    </vbox>

+  </wizardpage>

+

+</wizard>

diff --git a/mailnews/extensions/newsblog/content/newsblogOverlay.js b/mailnews/extensions/newsblog/content/newsblogOverlay.js
new file mode 100644
index 000000000..f7e08ec95
--- /dev/null
+++ b/mailnews/extensions/newsblog/content/newsblogOverlay.js
@@ -0,0 +1,363 @@
+/* -*- Mode: JavaScript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+Components.utils.import("resource:///modules/gloda/mimemsg.js");
+Components.utils.import("resource:///modules/mailServices.js");
+Components.utils.import("resource://gre/modules/Services.jsm");
+
+// This global is for SeaMonkey compatibility.
+var gShowFeedSummary;
+
+var FeedMessageHandler = {
+  gShowSummary: true,
+  gToggle: false,
+  kSelectOverrideWebPage:   0,
+  kSelectOverrideSummary:   1,
+  kSelectFeedDefault:       2,
+  kOpenWebPage:             0,
+  kOpenSummary:             1,
+  kOpenToggleInMessagePane: 2,
+  kOpenLoadInBrowser:       3,
+
+  /**
+   * How to load message on threadpane select.
+   */
+  get onSelectPref() {
+    return Services.prefs.getIntPref("rss.show.summary");
+  },
+
+  set onSelectPref(val) {
+    Services.prefs.setIntPref("rss.show.summary", val);
+    ReloadMessage();
+  },
+
+  /**
+   * Load web page on threadpane select.
+   */
+  get loadWebPageOnSelectPref() {
+    return Services.prefs.getIntPref("rss.message.loadWebPageOnSelect") ? true : false;
+  },
+
+  /**
+   * How to load message on open (enter/dbl click in threadpane, contextmenu).
+   */
+  get onOpenPref() {
+    return Services.prefs.getIntPref("rss.show.content-base");
+  },
+
+  set onOpenPref(val) {
+    Services.prefs.setIntPref("rss.show.content-base", val);
+  },
+
+  /**
+   * Determine if a message is a feed message. Prior to Tb15, a message had to
+   * be in an rss acount type folder. In Tb15 and later, a flag is set on the
+   * message itself upon initial store; the message can be moved to any folder.
+   *
+   * @param nsIMsgDBHdr aMsgHdr - the message.
+   *
+   * @return true if message is a feed, false if not.
+   */
+  isFeedMessage: function(aMsgHdr) {
+    return (aMsgHdr instanceof Components.interfaces.nsIMsgDBHdr) &&
+           ((aMsgHdr.flags & Components.interfaces.nsMsgMessageFlags.FeedMsg) ||
+            (aMsgHdr.folder && aMsgHdr.folder.server.type == "rss"));
+  },
+
+  /**
+   * Determine whether to show a feed message summary or load a web page in the
+   * message pane.
+   *
+   * @param nsIMsgDBHdr aMsgHdr - the message.
+   * @param bool aToggle        - true if in toggle mode, false otherwise.
+   *
+   * @return true if summary is to be displayed, false if web page.
+   */
+  shouldShowSummary: function(aMsgHdr, aToggle) {
+    // Not a feed message, always show summary (the message).
+    if (!this.isFeedMessage(aMsgHdr))
+      return true;
+
+    // Notified of a summary reload when toggling, reset toggle and return.
+    if (!aToggle && this.gToggle)
+      return !(this.gToggle = false);
+
+    let showSummary = true;
+    this.gToggle = aToggle;
+
+    // Thunderbird 2 rss messages with 'Show article summary' not selected,
+    // ie message body constructed to show web page in an iframe, can't show
+    // a summary - notify user.
+    let browser = getBrowser();
+    let contentDoc = browser ? browser.contentDocument : null;
+    let rssIframe = contentDoc ? contentDoc.getElementById("_mailrssiframe") : null;
+    if (rssIframe) {
+      if (this.gToggle || this.onSelectPref == this.kSelectOverrideSummary)
+        this.gToggle = false;
+      return false;
+    }
+
+    if (aToggle)
+      // Toggle mode, flip value.
+      return gShowFeedSummary = this.gShowSummary = !this.gShowSummary;
+
+    let wintype = document.documentElement.getAttribute("windowtype");
+    let tabMail = document.getElementById("tabmail");
+    let messageTab = tabMail && tabMail.currentTabInfo.mode.type == "message";
+    let messageWindow = wintype == "mail:messageWindow";
+
+    switch (this.onSelectPref) {
+      case this.kSelectOverrideWebPage:
+        showSummary = false;
+        break;
+      case this.kSelectOverrideSummary:
+        showSummary = true
+        break;
+      case this.kSelectFeedDefault:
+        // Get quickmode per feed folder pref from feeds.rdf. If the feed
+        // message is not in a feed account folder (hence the folder is not in
+        // the feeds database), or FZ_QUICKMODE property is not found (possible
+        // in pre renovation urls), err on the side of showing the summary.
+        // For the former, toggle or global override is necessary; for the
+        // latter, a show summary checkbox toggle in Subscribe dialog will set
+        // one on the path to bliss.
+        let folder = aMsgHdr.folder, targetRes;
+        try {
+          targetRes = FeedUtils.getParentTargetForChildResource(
+                        folder.URI, FeedUtils.FZ_QUICKMODE, folder.server);
+        }
+        catch (ex) {
+          // Not in a feed account folder or other error.
+          FeedUtils.log.info("FeedMessageHandler.shouldShowSummary: could not " +
+                             "get summary pref for this folder");
+        }
+
+        showSummary = targetRes && targetRes.QueryInterface(Ci.nsIRDFLiteral).
+                                             Value == "false" ? false : true;
+        break;
+    }
+
+    gShowFeedSummary = this.gShowSummary = showSummary;
+
+    if (messageWindow || messageTab) {
+      // Message opened in either standalone window or tab, due to either
+      // message open pref (we are here only if the pref is 0 or 1) or
+      // contextmenu open.
+      switch (this.onOpenPref) {
+        case this.kOpenToggleInMessagePane:
+          // Opened by contextmenu, use the value derived above.
+          // XXX: allow a toggle via crtl?
+          break;
+        case this.kOpenWebPage:
+          showSummary = false;
+          break;
+        case this.kOpenSummary:
+          showSummary = true;
+          break;
+      }
+    }
+
+    // Auto load web page in browser on select, per pref; shouldShowSummary() is
+    // always called first to 1)test if feed, 2)get summary pref, so do it here.
+    if (this.loadWebPageOnSelectPref)
+      setTimeout(FeedMessageHandler.loadWebPage, 20, aMsgHdr, {browser:true});
+
+    return showSummary;
+  },
+
+  /**
+   * Load a web page for feed messages. Use MsgHdrToMimeMessage() to get
+   * the content-base url from the message headers. We cannot rely on
+   * currentHeaderData; it has not yet been streamed at our entry point in
+   * displayMessageChanged(), and in the case of a collapsed message pane it
+   * is not streamed.
+   *
+   * @param nsIMsgDBHdr aMessageHdr - the message.
+   * @param {obj} aWhere            - name value=true pair, where name is in:
+   *                                  'messagepane', 'browser', 'tab', 'window'.
+   */
+  loadWebPage: function(aMessageHdr, aWhere) {
+    MsgHdrToMimeMessage(aMessageHdr, null, function(aMsgHdr, aMimeMsg) {
+      if (aMimeMsg && aMimeMsg.headers["content-base"] &&
+          aMimeMsg.headers["content-base"][0]) {
+        let url = aMimeMsg.headers["content-base"], uri;
+        try {
+          let converter = Cc["@mozilla.org/intl/scriptableunicodeconverter"]
+                            .createInstance(Ci.nsIScriptableUnicodeConverter);
+          converter.charset = "UTF-8";
+          url = converter.ConvertToUnicode(url);
+          uri = Services.io.newURI(url, null, null);
+          url = uri.spec;
+        }
+        catch (ex) {
+          FeedUtils.log.info("FeedMessageHandler.loadWebPage: " +
+                             "invalid Content-Base header url - " + url);
+          return;
+        }
+        if (aWhere.browser)
+          Components.classes["@mozilla.org/uriloader/external-protocol-service;1"]
+                    .getService(Components.interfaces.nsIExternalProtocolService)
+                    .loadURI(uri);
+        else if (aWhere.messagepane) {
+          let loadFlag = getBrowser().webNavigation.LOAD_FLAGS_NONE;
+          getBrowser().webNavigation.loadURI(url, loadFlag, null, null, null);
+        }
+        else if (aWhere.tab)
+          openContentTab(url, "tab", "^");
+        else if (aWhere.window)
+          openContentTab(url, "window", "^");
+      }
+      else
+        FeedUtils.log.info("FeedMessageHandler.loadWebPage: could not get " +
+                           "Content-Base header url for this message");
+    });
+  },
+
+  /**
+   * Display summary or load web page for feed messages. Caller should already
+   * know if the message is a feed message.
+   *
+   * @param nsIMsgDBHdr aMsgHdr - the message.
+   * @param bool aShowSummary   - true if summary is to be displayed, false if
+   *                              web page.
+   */
+  setContent: function(aMsgHdr, aShowSummary) {
+    if (aShowSummary) {
+      // Only here if toggling to summary in 3pane.
+      if (this.gToggle && gDBView && GetNumSelectedMessages() == 1)
+        ReloadMessage();
+    }
+    else {
+      let browser = getBrowser();
+      if (browser && browser.contentDocument && browser.contentDocument.body)
+        browser.contentDocument.body.hidden = true;
+      // If in a non rss folder, hide possible remote content bar on a web
+      // page load, as it doesn't apply.
+      if ("msgNotificationBar" in window)
+        gMessageNotificationBar.clearMsgNotifications();
+
+      this.loadWebPage(aMsgHdr, {messagepane:true});
+      this.gToggle = false;
+    }
+  }
+}
+
+function openSubscriptionsDialog(aFolder)
+{
+  // Check for an existing feed subscriptions window and focus it.
+  let subscriptionsWindow =
+    Services.wm.getMostRecentWindow("Mail:News-BlogSubscriptions");
+
+  if (subscriptionsWindow)
+  {
+    if (aFolder)
+    {
+      subscriptionsWindow.FeedSubscriptions.selectFolder(aFolder);
+      subscriptionsWindow.FeedSubscriptions.mView.treeBox.ensureRowIsVisible(
+        subscriptionsWindow.FeedSubscriptions.mView.selection.currentIndex);
+    }
+
+    subscriptionsWindow.focus();
+  }
+  else
+  {
+    window.openDialog("chrome://messenger-newsblog/content/feed-subscriptions.xul",
+                      "", "centerscreen,chrome,dialog=no,resizable",
+                      { folder: aFolder});
+  }
+}
+
+// Special case attempts to reply/forward/edit as new RSS articles. For
+// messages stored prior to Tb15, we are here only if the message's folder's
+// account server is rss and feed messages moved to other types will have their
+// summaries loaded, as viewing web pages only happened in an rss account.
+// The user may choose whether to load a summary or web page link by ensuring
+// the current feed message is being viewed as either a summary or web page.
+function openComposeWindowForRSSArticle(aMsgComposeWindow, aMsgHdr, aMessageUri,
+                                        aType, aFormat, aIdentity, aMsgWindow)
+{
+  // Ensure right content is handled for web pages in window/tab.
+  let tabmail = document.getElementById("tabmail");
+  let is3pane = tabmail && tabmail.selectedTab && tabmail.selectedTab.mode ?
+                  tabmail.selectedTab.mode.type == "folder" : false;
+  let showingwebpage = ("FeedMessageHandler" in window) && !is3pane &&
+                       FeedMessageHandler.onOpenPref == FeedMessageHandler.kOpenWebPage;
+
+  if (gShowFeedSummary && !showingwebpage)
+  {
+    // The user is viewing the summary.
+    MailServices.compose.OpenComposeWindow(aMsgComposeWindow, aMsgHdr, aMessageUri,
+                                           aType, aFormat, aIdentity, aMsgWindow);
+
+  }
+  else
+  {
+    // Set up the compose message and get the feed message's web page link.
+    let Cc = Components.classes;
+    let Ci = Components.interfaces;
+    let msgHdr = aMsgHdr;
+    let type = aType;
+    let msgComposeType = Ci.nsIMsgCompType;
+    let subject = msgHdr.mime2DecodedSubject;
+    let fwdPrefix = Services.prefs.getCharPref("mail.forward_subject_prefix");
+    fwdPrefix = fwdPrefix ? fwdPrefix + ": " : "";
+
+    let params = Cc["@mozilla.org/messengercompose/composeparams;1"]
+                   .createInstance(Ci.nsIMsgComposeParams);
+
+    let composeFields = Cc["@mozilla.org/messengercompose/composefields;1"]
+                          .createInstance(Ci.nsIMsgCompFields);
+
+    if (type == msgComposeType.Reply ||
+        type == msgComposeType.ReplyAll ||
+        type == msgComposeType.ReplyToSender ||
+        type == msgComposeType.ReplyToGroup ||
+        type == msgComposeType.ReplyToSenderAndGroup)
+    {
+      subject = "Re: " + subject;
+    }
+    else if (type == msgComposeType.ForwardInline ||
+             type == msgComposeType.ForwardAsAttachment)
+    {
+      subject = fwdPrefix + subject;
+    }
+
+    params.composeFields = composeFields;
+    params.composeFields.subject = subject;
+    params.composeFields.characterSet = msgHdr.Charset;
+    params.composeFields.body = "";
+    params.bodyIsLink = false;
+    params.identity = aIdentity;
+
+    try
+    {
+      // The feed's web page url is stored in the Content-Base header.
+      MsgHdrToMimeMessage(msgHdr, null, function(aMsgHdr, aMimeMsg) {
+        if (aMimeMsg && aMimeMsg.headers["content-base"] &&
+            aMimeMsg.headers["content-base"][0])
+        {
+          let converter = Cc["@mozilla.org/intl/scriptableunicodeconverter"]
+                            .createInstance(Ci.nsIScriptableUnicodeConverter);
+          converter.charset = "UTF-8";
+          let url = converter.ConvertToUnicode(aMimeMsg.headers["content-base"]);
+          params.composeFields.body = url;
+          params.bodyIsLink = true;
+          MailServices.compose.OpenComposeWindowWithParams(null, params);
+        }
+        else
+          // No content-base url, use the summary.
+          MailServices.compose.OpenComposeWindow(aMsgComposeWindow, aMsgHdr, aMessageUri,
+                                                 aType, aFormat, aIdentity, aMsgWindow);
+
+      }, false, {saneBodySize: true});
+    }
+    catch (ex)
+    {
+      // Error getting header, use the summary.
+      MailServices.compose.OpenComposeWindow(aMsgComposeWindow, aMsgHdr, aMessageUri,
+                                             aType, aFormat, aIdentity, aMsgWindow);
+    }
+  }
+}