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diff --git a/base/content/browser-feeds.js b/base/content/browser-feeds.js
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+# -*- 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 Handler object manages discovery of RSS/ATOM feeds in web pages
+ * and shows UI when they are discovered.
+ */
+var FeedHandler = {
+
+  /* Pale Moon: Address Bar: Feeds 
+   * The click handler for the Feed icon in the location bar. Opens the
+   * subscription page if user is not given a choice of feeds.
+   * (Otherwise the list of available feeds will be presented to the
+   * user in a popup menu.)
+   */
+  onFeedButtonPMClick: function(event) {
+    event.stopPropagation();
+
+    if (event.target.hasAttribute("feed") &&
+        event.eventPhase == Event.AT_TARGET &&
+        (event.button == 0 || event.button == 1)) {
+        this.subscribeToFeed(null, event);
+    }
+  },
+  
+  /**
+   * The click handler for the Feed icon in the toolbar. Opens the
+   * subscription page if user is not given a choice of feeds.
+   * (Otherwise the list of available feeds will be presented to the
+   * user in a popup menu.)
+   */
+  onFeedButtonClick: function(event) {
+    event.stopPropagation();
+
+    let feeds = gBrowser.selectedBrowser.feeds || [];
+    // If there are multiple feeds, the menu will open, so no need to do
+    // anything. If there are no feeds, nothing to do either.
+    if (feeds.length != 1)
+      return;
+
+    if (event.eventPhase == Event.AT_TARGET &&
+        (event.button == 0 || event.button == 1)) {
+      this.subscribeToFeed(feeds[0].href, event);
+    }
+  },
+
+ /** Called when the user clicks on the Subscribe to This Page... menu item.
+   * Builds a menu of unique feeds associated with the page, and if there
+   * is only one, shows the feed inline in the browser window.
+   * @param   menuPopup
+   *          The feed list menupopup to be populated.
+   * @returns true if the menu should be shown, false if there was only
+   *          one feed and the feed should be shown inline in the browser
+   *          window (do not show the menupopup).
+   */
+  buildFeedList: function(menuPopup) {
+    var feeds = gBrowser.selectedBrowser.feeds;
+    if (feeds == null) {
+      // XXX hack -- menu opening depends on setting of an "open"
+      // attribute, and the menu refuses to open if that attribute is
+      // set (because it thinks it's already open).  onpopupshowing gets
+      // called after the attribute is unset, and it doesn't get unset
+      // if we return false.  so we unset it here; otherwise, the menu
+      // refuses to work past this point.
+      menuPopup.parentNode.removeAttribute("open");
+      return false;
+    }
+
+    while (menuPopup.firstChild)
+      menuPopup.removeChild(menuPopup.firstChild);
+
+    if (feeds.length == 1) {
+      var feedButtonPM = document.getElementById("ub-feed-button");
+      if (feedButtonPM)
+        feedButtonPM.setAttribute("feed", feeds[0].href);
+      return false;
+    }
+
+    if (feeds.length <= 1)
+      return false;
+
+    // Build the menu showing the available feed choices for viewing.
+    for (let feedInfo of feeds) {
+      var menuItem = document.createElement("menuitem");
+      var baseTitle = feedInfo.title || feedInfo.href;
+      var labelStr = gNavigatorBundle.getFormattedString("feedShowFeedNew", [baseTitle]);
+      menuItem.setAttribute("class", "feed-menuitem");
+      menuItem.setAttribute("label", labelStr);
+      menuItem.setAttribute("feed", feedInfo.href);
+      menuItem.setAttribute("tooltiptext", feedInfo.href);
+      menuItem.setAttribute("crop", "center");
+      menuPopup.appendChild(menuItem);
+    }
+    return true;
+  },
+
+  /**
+   * Subscribe to a given feed.  Called when
+   *   1. Page has a single feed and user clicks feed icon in location bar
+   *   2. Page has a single feed and user selects Subscribe menu item
+   *   3. Page has multiple feeds and user selects from feed icon popup
+   *   4. Page has multiple feeds and user selects from Subscribe submenu
+   * @param   href
+   *          The feed to subscribe to. May be null, in which case the
+   *          event target's feed attribute is examined.
+   * @param   event
+   *          The event this method is handling. Used to decide where
+   *          to open the preview UI. (Optional, unless href is null)
+   */
+  subscribeToFeed: function(href, event) {
+    // Just load the feed in the content area to either subscribe or show the
+    // preview UI
+    if (!href)
+      href = event.target.getAttribute("feed");
+    urlSecurityCheck(href, gBrowser.contentPrincipal,
+                     Ci.nsIScriptSecurityManager.DISALLOW_INHERIT_PRINCIPAL);
+    var feedURI = makeURI(href, document.characterSet);
+    // Use the feed scheme so X-Moz-Is-Feed will be set
+    // The value doesn't matter
+    if (/^https?$/.test(feedURI.scheme))
+      href = "feed:" + href;
+    this.loadFeed(href, event);
+  },
+
+  loadFeed: function(href, event) {
+    var feeds = gBrowser.selectedBrowser.feeds;
+    try {
+      openUILink(href, event, { ignoreAlt: true });
+    }
+    finally {
+      // We might default to a livebookmarks modal dialog,
+      // so reset that if the user happens to click it again
+      gBrowser.selectedBrowser.feeds = feeds;
+    }
+  },
+
+  get _feedMenuitem() {
+    delete this._feedMenuitem;
+    return this._feedMenuitem = document.getElementById("singleFeedMenuitemState");
+  },
+
+  get _feedMenupopup() {
+    delete this._feedMenupopup;
+    return this._feedMenupopup = document.getElementById("multipleFeedsMenuState");
+  },
+
+  /**
+   * Update the browser UI to show whether or not feeds are available when
+   * a page is loaded or the user switches tabs to a page that has feeds.
+   */
+  updateFeeds: function() {
+    if (this._updateFeedTimeout)
+      clearTimeout(this._updateFeedTimeout);
+
+    var feeds = gBrowser.selectedBrowser.feeds;
+    var haveFeeds = feeds && feeds.length > 0;
+
+    var feedButtonPM = document.getElementById("ub-feed-button");
+
+    var feedButton = document.getElementById("feed-button");
+    
+    if (feedButton)
+      feedButton.disabled = !haveFeeds;
+    
+    if (feedButtonPM) {
+        if (!haveFeeds) {
+          feedButtonPM.collapsed = true;
+          feedButtonPM.removeAttribute("feed");
+        } else {
+          feedButtonPM.collapsed = !gPrefService.getBoolPref("browser.urlbar.rss");
+        }
+      }
+
+    if (!haveFeeds) {
+      this._feedMenuitem.setAttribute("disabled", "true");
+      this._feedMenuitem.removeAttribute("hidden");
+      this._feedMenupopup.setAttribute("hidden", "true");
+      return;
+    }
+
+    if (feeds.length > 1) {
+      if (feedButtonPM)
+        feedButtonPM.removeAttribute("feed");
+      this._feedMenuitem.setAttribute("hidden", "true");
+      this._feedMenupopup.removeAttribute("hidden");
+    } else {
+      if (feedButtonPM)
+        feedButtonPM.setAttribute("feed", feeds[0].href);
+      this._feedMenuitem.setAttribute("feed", feeds[0].href);
+      this._feedMenuitem.removeAttribute("disabled");
+      this._feedMenuitem.removeAttribute("hidden");
+      this._feedMenupopup.setAttribute("hidden", "true");
+    }
+  },
+
+  addFeed: function(link, targetDoc) {
+    // find which tab this is for, and set the attribute on the browser
+    var browserForLink = gBrowser.getBrowserForDocument(targetDoc);
+    if (!browserForLink) {
+      // ignore feeds loaded in subframes (see bug 305472)
+      return;
+    }
+
+    if (!browserForLink.feeds)
+      browserForLink.feeds = [];
+
+    browserForLink.feeds.push({ href: link.href, title: link.title });
+
+    // If this addition was for the current browser, update the UI. For
+    // background browsers, we'll update on tab switch.
+    if (browserForLink == gBrowser.selectedBrowser) {
+      var feedButtonPM = document.getElementById("ub-feed-button");
+      if (feedButtonPM)
+        feedButtonPM.collapsed = !gPrefService.getBoolPref("browser.urlbar.rss");
+      // Batch updates to avoid updating the UI for multiple onLinkAdded events
+      // fired within 100ms of each other.
+      if (this._updateFeedTimeout)
+        clearTimeout(this._updateFeedTimeout);
+      this._updateFeedTimeout = setTimeout(this.updateFeeds.bind(this), 100);
+    }
+  }
+};