Add m-esr52 at 52.6.0

1 files changed, 1503 insertions, 0 deletions

diff --git a/browser/base/content/content.js b/browser/base/content/content.js
new file mode 100644
index 000000000..658d2014d
--- /dev/null
+++ b/browser/base/content/content.js
@@ -0,0 +1,1503 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 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 content script should work in any browser or iframe and should not
+ * depend on the frame being contained in tabbrowser. */
+
+var {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource:///modules/ContentWebRTC.jsm");
+Cu.import("resource:///modules/ContentObservers.jsm");
+Cu.import("resource://gre/modules/InlineSpellChecker.jsm");
+Cu.import("resource://gre/modules/InlineSpellCheckerContent.jsm");
+Cu.import("resource://gre/modules/Task.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "E10SUtils",
+  "resource:///modules/E10SUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "BrowserUtils",
+  "resource://gre/modules/BrowserUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "ContentLinkHandler",
+  "resource:///modules/ContentLinkHandler.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "LoginManagerContent",
+  "resource://gre/modules/LoginManagerContent.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "LoginFormFactory",
+  "resource://gre/modules/LoginManagerContent.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "InsecurePasswordUtils",
+  "resource://gre/modules/InsecurePasswordUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "PluginContent",
+  "resource:///modules/PluginContent.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "PrivateBrowsingUtils",
+  "resource://gre/modules/PrivateBrowsingUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "FormSubmitObserver",
+  "resource:///modules/FormSubmitObserver.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "PageMetadata",
+  "resource://gre/modules/PageMetadata.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "PlacesUIUtils",
+  "resource:///modules/PlacesUIUtils.jsm");
+XPCOMUtils.defineLazyGetter(this, "PageMenuChild", function() {
+  let tmp = {};
+  Cu.import("resource://gre/modules/PageMenu.jsm", tmp);
+  return new tmp.PageMenuChild();
+});
+XPCOMUtils.defineLazyModuleGetter(this, "Feeds",
+  "resource:///modules/Feeds.jsm");
+
+Cu.importGlobalProperties(["URL"]);
+
+// TabChildGlobal
+var global = this;
+
+// Load the form validation popup handler
+var formSubmitObserver = new FormSubmitObserver(content, this);
+
+addMessageListener("ContextMenu:DoCustomCommand", function(message) {
+  E10SUtils.wrapHandlingUserInput(
+    content, message.data.handlingUserInput,
+    () => PageMenuChild.executeMenu(message.data.generatedItemId));
+});
+
+addMessageListener("RemoteLogins:fillForm", function(message) {
+  LoginManagerContent.receiveMessage(message, content);
+});
+addEventListener("DOMFormHasPassword", function(event) {
+  LoginManagerContent.onDOMFormHasPassword(event, content);
+  let formLike = LoginFormFactory.createFromForm(event.target);
+  InsecurePasswordUtils.reportInsecurePasswords(formLike);
+});
+addEventListener("DOMInputPasswordAdded", function(event) {
+  LoginManagerContent.onDOMInputPasswordAdded(event, content);
+  let formLike = LoginFormFactory.createFromField(event.target);
+  InsecurePasswordUtils.reportInsecurePasswords(formLike);
+});
+addEventListener("pageshow", function(event) {
+  LoginManagerContent.onPageShow(event, content);
+});
+addEventListener("DOMAutoComplete", function(event) {
+  LoginManagerContent.onUsernameInput(event);
+});
+addEventListener("blur", function(event) {
+  LoginManagerContent.onUsernameInput(event);
+});
+
+var handleContentContextMenu = function (event) {
+  let defaultPrevented = event.defaultPrevented;
+  if (!Services.prefs.getBoolPref("dom.event.contextmenu.enabled")) {
+    let plugin = null;
+    try {
+      plugin = event.target.QueryInterface(Ci.nsIObjectLoadingContent);
+    } catch (e) {}
+    if (plugin && plugin.displayedType == Ci.nsIObjectLoadingContent.TYPE_PLUGIN) {
+      // Don't open a context menu for plugins.
+      return;
+    }
+
+    defaultPrevented = false;
+  }
+
+  if (defaultPrevented)
+    return;
+
+  let addonInfo = {};
+  let subject = {
+    event: event,
+    addonInfo: addonInfo,
+  };
+  subject.wrappedJSObject = subject;
+  Services.obs.notifyObservers(subject, "content-contextmenu", null);
+
+  let doc = event.target.ownerDocument;
+  let docLocation = doc.mozDocumentURIIfNotForErrorPages;
+  docLocation = docLocation && docLocation.spec;
+  let charSet = doc.characterSet;
+  let baseURI = doc.baseURI;
+  let referrer = doc.referrer;
+  let referrerPolicy = doc.referrerPolicy;
+  let frameOuterWindowID = doc.defaultView.QueryInterface(Ci.nsIInterfaceRequestor)
+                                          .getInterface(Ci.nsIDOMWindowUtils)
+                                          .outerWindowID;
+  let loginFillInfo = LoginManagerContent.getFieldContext(event.target);
+
+  // The same-origin check will be done in nsContextMenu.openLinkInTab.
+  let parentAllowsMixedContent = !!docShell.mixedContentChannel;
+
+  // get referrer attribute from clicked link and parse it
+  // if per element referrer is enabled, the element referrer overrules
+  // the document wide referrer
+  if (Services.prefs.getBoolPref("network.http.enablePerElementReferrer")) {
+    let referrerAttrValue = Services.netUtils.parseAttributePolicyString(event.target.
+                            getAttribute("referrerpolicy"));
+    if (referrerAttrValue !== Ci.nsIHttpChannel.REFERRER_POLICY_UNSET) {
+      referrerPolicy = referrerAttrValue;
+    }
+  }
+
+  let disableSetDesktopBg = null;
+  // Media related cache info parent needs for saving
+  let contentType = null;
+  let contentDisposition = null;
+  if (event.target.nodeType == Ci.nsIDOMNode.ELEMENT_NODE &&
+      event.target instanceof Ci.nsIImageLoadingContent &&
+      event.target.currentURI) {
+    disableSetDesktopBg = disableSetDesktopBackground(event.target);
+
+    try {
+      let imageCache =
+        Cc["@mozilla.org/image/tools;1"].getService(Ci.imgITools)
+                                        .getImgCacheForDocument(doc);
+      let props =
+        imageCache.findEntryProperties(event.target.currentURI, doc);
+      try {
+        contentType = props.get("type", Ci.nsISupportsCString).data;
+      } catch (e) {}
+      try {
+        contentDisposition =
+          props.get("content-disposition", Ci.nsISupportsCString).data;
+      } catch (e) {}
+    } catch (e) {}
+  }
+
+  let selectionInfo = BrowserUtils.getSelectionDetails(content);
+
+  let loadContext = docShell.QueryInterface(Ci.nsILoadContext);
+  let userContextId = loadContext.originAttributes.userContextId;
+
+  if (Services.appinfo.processType == Services.appinfo.PROCESS_TYPE_CONTENT) {
+    let editFlags = SpellCheckHelper.isEditable(event.target, content);
+    let spellInfo;
+    if (editFlags &
+        (SpellCheckHelper.EDITABLE | SpellCheckHelper.CONTENTEDITABLE)) {
+      spellInfo =
+        InlineSpellCheckerContent.initContextMenu(event, editFlags, this);
+    }
+
+    // Set the event target first as the copy image command needs it to
+    // determine what was context-clicked on. Then, update the state of the
+    // commands on the context menu.
+    docShell.contentViewer.QueryInterface(Ci.nsIContentViewerEdit)
+            .setCommandNode(event.target);
+    event.target.ownerGlobal.updateCommands("contentcontextmenu");
+
+    let customMenuItems = PageMenuChild.build(event.target);
+    let principal = doc.nodePrincipal;
+    sendRpcMessage("contextmenu",
+                   { editFlags, spellInfo, customMenuItems, addonInfo,
+                     principal, docLocation, charSet, baseURI, referrer,
+                     referrerPolicy, contentType, contentDisposition,
+                     frameOuterWindowID, selectionInfo, disableSetDesktopBg,
+                     loginFillInfo, parentAllowsMixedContent, userContextId },
+                   { event, popupNode: event.target });
+  }
+  else {
+    // Break out to the parent window and pass the add-on info along
+    let browser = docShell.chromeEventHandler;
+    let mainWin = browser.ownerGlobal;
+    mainWin.gContextMenuContentData = {
+      isRemote: false,
+      event: event,
+      popupNode: event.target,
+      browser: browser,
+      addonInfo: addonInfo,
+      documentURIObject: doc.documentURIObject,
+      docLocation: docLocation,
+      charSet: charSet,
+      referrer: referrer,
+      referrerPolicy: referrerPolicy,
+      contentType: contentType,
+      contentDisposition: contentDisposition,
+      selectionInfo: selectionInfo,
+      disableSetDesktopBackground: disableSetDesktopBg,
+      loginFillInfo,
+      parentAllowsMixedContent,
+      userContextId,
+    };
+  }
+}
+
+Cc["@mozilla.org/eventlistenerservice;1"]
+  .getService(Ci.nsIEventListenerService)
+  .addSystemEventListener(global, "contextmenu", handleContentContextMenu, false);
+
+// Values for telemtery bins: see TLS_ERROR_REPORT_UI in Histograms.json
+const TLS_ERROR_REPORT_TELEMETRY_UI_SHOWN = 0;
+const TLS_ERROR_REPORT_TELEMETRY_EXPANDED = 1;
+const TLS_ERROR_REPORT_TELEMETRY_SUCCESS  = 6;
+const TLS_ERROR_REPORT_TELEMETRY_FAILURE  = 7;
+
+const SEC_ERROR_BASE          = Ci.nsINSSErrorsService.NSS_SEC_ERROR_BASE;
+const MOZILLA_PKIX_ERROR_BASE = Ci.nsINSSErrorsService.MOZILLA_PKIX_ERROR_BASE;
+
+const SEC_ERROR_EXPIRED_CERTIFICATE                = SEC_ERROR_BASE + 11;
+const SEC_ERROR_UNKNOWN_ISSUER                     = SEC_ERROR_BASE + 13;
+const SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE         = SEC_ERROR_BASE + 30;
+const SEC_ERROR_OCSP_FUTURE_RESPONSE               = SEC_ERROR_BASE + 131;
+const SEC_ERROR_OCSP_OLD_RESPONSE                  = SEC_ERROR_BASE + 132;
+const MOZILLA_PKIX_ERROR_NOT_YET_VALID_CERTIFICATE = MOZILLA_PKIX_ERROR_BASE + 5;
+const MOZILLA_PKIX_ERROR_NOT_YET_VALID_ISSUER_CERTIFICATE = MOZILLA_PKIX_ERROR_BASE + 6;
+
+const PREF_BLOCKLIST_CLOCK_SKEW_SECONDS = "services.blocklist.clock_skew_seconds";
+
+const PREF_SSL_IMPACT_ROOTS = ["security.tls.version.", "security.ssl3."];
+
+const PREF_SSL_IMPACT = PREF_SSL_IMPACT_ROOTS.reduce((prefs, root) => {
+  return prefs.concat(Services.prefs.getChildList(root));
+}, []);
+
+
+function getSerializedSecurityInfo(docShell) {
+  let serhelper = Cc["@mozilla.org/network/serialization-helper;1"]
+                    .getService(Ci.nsISerializationHelper);
+
+  let securityInfo = docShell.failedChannel && docShell.failedChannel.securityInfo;
+  if (!securityInfo) {
+    return "";
+  }
+  securityInfo.QueryInterface(Ci.nsITransportSecurityInfo)
+              .QueryInterface(Ci.nsISerializable);
+
+  return serhelper.serializeToString(securityInfo);
+}
+
+var AboutNetAndCertErrorListener = {
+  init: function(chromeGlobal) {
+    addMessageListener("CertErrorDetails", this);
+    addMessageListener("Browser:CaptivePortalFreed", this);
+    chromeGlobal.addEventListener('AboutNetErrorLoad', this, false, true);
+    chromeGlobal.addEventListener('AboutNetErrorOpenCaptivePortal', this, false, true);
+    chromeGlobal.addEventListener('AboutNetErrorSetAutomatic', this, false, true);
+    chromeGlobal.addEventListener('AboutNetErrorOverride', this, false, true);
+    chromeGlobal.addEventListener('AboutNetErrorResetPreferences', this, false, true);
+  },
+
+  get isAboutNetError() {
+    return content.document.documentURI.startsWith("about:neterror");
+  },
+
+  get isAboutCertError() {
+    return content.document.documentURI.startsWith("about:certerror");
+  },
+
+  receiveMessage: function(msg) {
+    if (!this.isAboutCertError) {
+      return;
+    }
+
+    switch (msg.name) {
+      case "CertErrorDetails":
+        this.onCertErrorDetails(msg);
+        break;
+      case "Browser:CaptivePortalFreed":
+        this.onCaptivePortalFreed(msg);
+        break;
+    }
+  },
+
+  onCertErrorDetails(msg) {
+    let div = content.document.getElementById("certificateErrorText");
+    div.textContent = msg.data.info;
+    let learnMoreLink = content.document.getElementById("learnMoreLink");
+    let baseURL = Services.urlFormatter.formatURLPref("app.support.baseURL");
+
+    switch (msg.data.code) {
+      case SEC_ERROR_UNKNOWN_ISSUER:
+        learnMoreLink.href = baseURL  + "security-error";
+        break;
+
+      // in case the certificate expired we make sure the system clock
+      // matches settings server (kinto) time
+      case SEC_ERROR_EXPIRED_CERTIFICATE:
+      case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+      case SEC_ERROR_OCSP_FUTURE_RESPONSE:
+      case SEC_ERROR_OCSP_OLD_RESPONSE:
+      case MOZILLA_PKIX_ERROR_NOT_YET_VALID_CERTIFICATE:
+      case MOZILLA_PKIX_ERROR_NOT_YET_VALID_ISSUER_CERTIFICATE:
+
+        // use blocklist stats if available
+        if (Services.prefs.getPrefType(PREF_BLOCKLIST_CLOCK_SKEW_SECONDS)) {
+          let difference = Services.prefs.getIntPref(PREF_BLOCKLIST_CLOCK_SKEW_SECONDS);
+
+          // if the difference is more than a day
+          if (Math.abs(difference) > 60 * 60 * 24) {
+            let formatter = new Intl.DateTimeFormat();
+            let systemDate = formatter.format(new Date());
+            // negative difference means local time is behind server time
+            let actualDate = formatter.format(new Date(Date.now() - difference * 1000));
+
+            content.document.getElementById("wrongSystemTime_URL")
+              .textContent = content.document.location.hostname;
+            content.document.getElementById("wrongSystemTime_systemDate")
+              .textContent = systemDate;
+            content.document.getElementById("wrongSystemTime_actualDate")
+              .textContent = actualDate;
+
+            content.document.getElementById("errorShortDesc")
+              .style.display = "none";
+            content.document.getElementById("wrongSystemTimePanel")
+              .style.display = "block";
+          }
+        }
+        learnMoreLink.href = baseURL  + "time-errors";
+        break;
+    }
+  },
+
+  onCaptivePortalFreed(msg) {
+    content.dispatchEvent(new content.CustomEvent("AboutNetErrorCaptivePortalFreed"));
+  },
+
+  handleEvent: function(aEvent) {
+    if (!this.isAboutNetError && !this.isAboutCertError) {
+      return;
+    }
+
+    switch (aEvent.type) {
+    case "AboutNetErrorLoad":
+      this.onPageLoad(aEvent);
+      break;
+    case "AboutNetErrorOpenCaptivePortal":
+      this.openCaptivePortalPage(aEvent);
+      break;
+    case "AboutNetErrorSetAutomatic":
+      this.onSetAutomatic(aEvent);
+      break;
+    case "AboutNetErrorOverride":
+      this.onOverride(aEvent);
+      break;
+    case "AboutNetErrorResetPreferences":
+      this.onResetPreferences(aEvent);
+      break;
+    }
+  },
+
+  changedCertPrefs: function () {
+    for (let prefName of PREF_SSL_IMPACT) {
+      if (Services.prefs.prefHasUserValue(prefName)) {
+        return true;
+      }
+    }
+
+    return false;
+  },
+
+  onPageLoad: function(evt) {
+    if (this.isAboutCertError) {
+      let originalTarget = evt.originalTarget;
+      let ownerDoc = originalTarget.ownerDocument;
+      ClickEventHandler.onCertError(originalTarget, ownerDoc);
+    }
+
+    let automatic = Services.prefs.getBoolPref("security.ssl.errorReporting.automatic");
+    content.dispatchEvent(new content.CustomEvent("AboutNetErrorOptions", {
+      detail: JSON.stringify({
+        enabled: Services.prefs.getBoolPref("security.ssl.errorReporting.enabled"),
+        changedCertPrefs: this.changedCertPrefs(),
+        automatic: automatic
+      })
+    }));
+
+    sendAsyncMessage("Browser:SSLErrorReportTelemetry",
+                     {reportStatus: TLS_ERROR_REPORT_TELEMETRY_UI_SHOWN});
+  },
+
+  openCaptivePortalPage: function(evt) {
+    sendAsyncMessage("Browser:OpenCaptivePortalPage");
+  },
+
+
+  onResetPreferences: function(evt) {
+    sendAsyncMessage("Browser:ResetSSLPreferences");
+  },
+
+  onSetAutomatic: function(evt) {
+    sendAsyncMessage("Browser:SetSSLErrorReportAuto", {
+      automatic: evt.detail
+    });
+
+    // if we're enabling reports, send a report for this failure
+    if (evt.detail) {
+      let {host, port} = content.document.mozDocumentURIIfNotForErrorPages;
+      sendAsyncMessage("Browser:SendSSLErrorReport", {
+        uri: { host, port },
+        securityInfo: getSerializedSecurityInfo(docShell),
+      });
+
+    }
+  },
+
+  onOverride: function(evt) {
+    let {host, port} = content.document.mozDocumentURIIfNotForErrorPages;
+    sendAsyncMessage("Browser:OverrideWeakCrypto", { uri: {host, port} });
+  }
+}
+
+AboutNetAndCertErrorListener.init(this);
+
+
+var ClickEventHandler = {
+  init: function init() {
+    Cc["@mozilla.org/eventlistenerservice;1"]
+      .getService(Ci.nsIEventListenerService)
+      .addSystemEventListener(global, "click", this, true);
+  },
+
+  handleEvent: function(event) {
+    if (!event.isTrusted || event.defaultPrevented || event.button == 2) {
+      return;
+    }
+
+    let originalTarget = event.originalTarget;
+    let ownerDoc = originalTarget.ownerDocument;
+    if (!ownerDoc) {
+      return;
+    }
+
+    // Handle click events from about pages
+    if (ownerDoc.documentURI.startsWith("about:certerror")) {
+      this.onCertError(originalTarget, ownerDoc);
+      return;
+    } else if (ownerDoc.documentURI.startsWith("about:blocked")) {
+      this.onAboutBlocked(originalTarget, ownerDoc);
+      return;
+    } else if (ownerDoc.documentURI.startsWith("about:neterror")) {
+      this.onAboutNetError(event, ownerDoc.documentURI);
+      return;
+    }
+
+    let [href, node, principal] = this._hrefAndLinkNodeForClickEvent(event);
+
+    // get referrer attribute from clicked link and parse it
+    // if per element referrer is enabled, the element referrer overrules
+    // the document wide referrer
+    let referrerPolicy = ownerDoc.referrerPolicy;
+    if (Services.prefs.getBoolPref("network.http.enablePerElementReferrer") &&
+        node) {
+      let referrerAttrValue = Services.netUtils.parseAttributePolicyString(node.
+                              getAttribute("referrerpolicy"));
+      if (referrerAttrValue !== Ci.nsIHttpChannel.REFERRER_POLICY_UNSET) {
+        referrerPolicy = referrerAttrValue;
+      }
+    }
+
+    let json = { button: event.button, shiftKey: event.shiftKey,
+                 ctrlKey: event.ctrlKey, metaKey: event.metaKey,
+                 altKey: event.altKey, href: null, title: null,
+                 bookmark: false, referrerPolicy: referrerPolicy,
+                 originAttributes: principal ? principal.originAttributes : {},
+                 isContentWindowPrivate: PrivateBrowsingUtils.isContentWindowPrivate(ownerDoc.defaultView)};
+
+    if (href) {
+      try {
+        BrowserUtils.urlSecurityCheck(href, principal);
+      } catch (e) {
+        return;
+      }
+
+      json.href = href;
+      if (node) {
+        json.title = node.getAttribute("title");
+        if (event.button == 0 && !event.ctrlKey && !event.shiftKey &&
+            !event.altKey && !event.metaKey) {
+          json.bookmark = node.getAttribute("rel") == "sidebar";
+          if (json.bookmark) {
+            event.preventDefault(); // Need to prevent the pageload.
+          }
+        }
+      }
+      json.noReferrer = BrowserUtils.linkHasNoReferrer(node)
+
+      // Check if the link needs to be opened with mixed content allowed.
+      // Only when the owner doc has |mixedContentChannel| and the same origin
+      // should we allow mixed content.
+      json.allowMixedContent = false;
+      let docshell = ownerDoc.defaultView.QueryInterface(Ci.nsIInterfaceRequestor)
+                             .getInterface(Ci.nsIWebNavigation)
+                             .QueryInterface(Ci.nsIDocShell);
+      if (docShell.mixedContentChannel) {
+        const sm = Services.scriptSecurityManager;
+        try {
+          let targetURI = BrowserUtils.makeURI(href);
+          sm.checkSameOriginURI(docshell.mixedContentChannel.URI, targetURI, false);
+          json.allowMixedContent = true;
+        } catch (e) {}
+      }
+      json.originPrincipal = ownerDoc.nodePrincipal;
+
+      sendAsyncMessage("Content:Click", json);
+      return;
+    }
+
+    // This might be middle mouse navigation.
+    if (event.button == 1) {
+      sendAsyncMessage("Content:Click", json);
+    }
+  },
+
+  onCertError: function (targetElement, ownerDoc) {
+    let docShell = ownerDoc.defaultView.QueryInterface(Ci.nsIInterfaceRequestor)
+                                       .getInterface(Ci.nsIWebNavigation)
+                                       .QueryInterface(Ci.nsIDocShell);
+    sendAsyncMessage("Browser:CertExceptionError", {
+      location: ownerDoc.location.href,
+      elementId: targetElement.getAttribute("id"),
+      isTopFrame: (ownerDoc.defaultView.parent === ownerDoc.defaultView),
+      securityInfoAsString: getSerializedSecurityInfo(docShell),
+    });
+  },
+
+  onAboutBlocked: function (targetElement, ownerDoc) {
+    var reason = 'phishing';
+    if (/e=malwareBlocked/.test(ownerDoc.documentURI)) {
+      reason = 'malware';
+    } else if (/e=unwantedBlocked/.test(ownerDoc.documentURI)) {
+      reason = 'unwanted';
+    }
+    sendAsyncMessage("Browser:SiteBlockedError", {
+      location: ownerDoc.location.href,
+      reason: reason,
+      elementId: targetElement.getAttribute("id"),
+      isTopFrame: (ownerDoc.defaultView.parent === ownerDoc.defaultView)
+    });
+  },
+
+  onAboutNetError: function (event, documentURI) {
+    let elmId = event.originalTarget.getAttribute("id");
+    if (elmId == "returnButton") {
+      sendAsyncMessage("Browser:SSLErrorGoBack", {});
+      return;
+    }
+    if (elmId != "errorTryAgain" || !/e=netOffline/.test(documentURI)) {
+      return;
+    }
+    // browser front end will handle clearing offline mode and refreshing
+    // the page *if* we're in offline mode now. Otherwise let the error page
+    // handle the click.
+    if (Services.io.offline) {
+      event.preventDefault();
+      sendAsyncMessage("Browser:EnableOnlineMode", {});
+    }
+  },
+
+  /**
+   * Extracts linkNode and href for the current click target.
+   *
+   * @param event
+   *        The click event.
+   * @return [href, linkNode, linkPrincipal].
+   *
+   * @note linkNode will be null if the click wasn't on an anchor
+   *       element. This includes SVG links, because callers expect |node|
+   *       to behave like an <a> element, which SVG links (XLink) don't.
+   */
+  _hrefAndLinkNodeForClickEvent: function(event) {
+    function isHTMLLink(aNode) {
+      // Be consistent with what nsContextMenu.js does.
+      return ((aNode instanceof content.HTMLAnchorElement && aNode.href) ||
+              (aNode instanceof content.HTMLAreaElement && aNode.href) ||
+              aNode instanceof content.HTMLLinkElement);
+    }
+
+    let node = event.target;
+    while (node && !isHTMLLink(node)) {
+      node = node.parentNode;
+    }
+
+    if (node)
+      return [node.href, node, node.ownerDocument.nodePrincipal];
+
+    // If there is no linkNode, try simple XLink.
+    let href, baseURI;
+    node = event.target;
+    while (node && !href) {
+      if (node.nodeType == content.Node.ELEMENT_NODE &&
+          (node.localName == "a" ||
+           node.namespaceURI == "http://www.w3.org/1998/Math/MathML")) {
+        href = node.getAttribute("href") ||
+               node.getAttributeNS("http://www.w3.org/1999/xlink", "href");
+        if (href) {
+          baseURI = node.ownerDocument.baseURIObject;
+          break;
+        }
+      }
+      node = node.parentNode;
+    }
+
+    // In case of XLink, we don't return the node we got href from since
+    // callers expect <a>-like elements.
+    // Note: makeURI() will throw if aUri is not a valid URI.
+    return [href ? BrowserUtils.makeURI(href, null, baseURI).spec : null, null,
+            node && node.ownerDocument.nodePrincipal];
+  }
+};
+ClickEventHandler.init();
+
+ContentLinkHandler.init(this);
+
+// TODO: Load this lazily so the JSM is run only if a relevant event/message fires.
+var pluginContent = new PluginContent(global);
+
+addEventListener("DOMWebNotificationClicked", function(event) {
+  sendAsyncMessage("DOMWebNotificationClicked", {});
+}, false);
+
+addEventListener("DOMServiceWorkerFocusClient", function(event) {
+  sendAsyncMessage("DOMServiceWorkerFocusClient", {});
+}, false);
+
+ContentWebRTC.init();
+addMessageListener("rtcpeer:Allow", ContentWebRTC);
+addMessageListener("rtcpeer:Deny", ContentWebRTC);
+addMessageListener("webrtc:Allow", ContentWebRTC);
+addMessageListener("webrtc:Deny", ContentWebRTC);
+addMessageListener("webrtc:StopSharing", ContentWebRTC);
+addMessageListener("webrtc:StartBrowserSharing", () => {
+  let windowID = content.QueryInterface(Ci.nsIInterfaceRequestor)
+                        .getInterface(Ci.nsIDOMWindowUtils).outerWindowID;
+  sendAsyncMessage("webrtc:response:StartBrowserSharing", {
+    windowID: windowID
+  });
+});
+
+addEventListener("pageshow", function(event) {
+  if (event.target == content.document) {
+    sendAsyncMessage("PageVisibility:Show", {
+      persisted: event.persisted,
+    });
+  }
+});
+addEventListener("pagehide", function(event) {
+  if (event.target == content.document) {
+    sendAsyncMessage("PageVisibility:Hide", {
+      persisted: event.persisted,
+    });
+  }
+});
+
+var PageMetadataMessenger = {
+  init() {
+    addMessageListener("PageMetadata:GetPageData", this);
+    addMessageListener("PageMetadata:GetMicroformats", this);
+  },
+  receiveMessage(message) {
+    switch (message.name) {
+      case "PageMetadata:GetPageData": {
+        let target = message.objects.target;
+        let result = PageMetadata.getData(content.document, target);
+        sendAsyncMessage("PageMetadata:PageDataResult", result);
+        break;
+      }
+      case "PageMetadata:GetMicroformats": {
+        let target = message.objects.target;
+        let result = PageMetadata.getMicroformats(content.document, target);
+        sendAsyncMessage("PageMetadata:MicroformatsResult", result);
+        break;
+      }
+    }
+  }
+}
+PageMetadataMessenger.init();
+
+addEventListener("ActivateSocialFeature", function (aEvent) {
+  let document = content.document;
+  let dwu = content.QueryInterface(Ci.nsIInterfaceRequestor)
+                   .getInterface(Ci.nsIDOMWindowUtils);
+  if (!dwu.isHandlingUserInput) {
+    Cu.reportError("attempt to activate provider without user input from " + document.nodePrincipal.origin);
+    return;
+  }
+
+  let node = aEvent.target;
+  let ownerDocument = node.ownerDocument;
+  let data = node.getAttribute("data-service");
+  if (data) {
+    try {
+      data = JSON.parse(data);
+    } catch (e) {
+      Cu.reportError("Social Service manifest parse error: " + e);
+      return;
+    }
+  } else {
+    Cu.reportError("Social Service manifest not available");
+    return;
+  }
+
+  sendAsyncMessage("Social:Activation", {
+    url: ownerDocument.location.href,
+    origin: ownerDocument.nodePrincipal.origin,
+    manifest: data
+  });
+}, true, true);
+
+addMessageListener("ContextMenu:SaveVideoFrameAsImage", (message) => {
+  let video = message.objects.target;
+  let canvas = content.document.createElementNS("http://www.w3.org/1999/xhtml", "canvas");
+  canvas.width = video.videoWidth;
+  canvas.height = video.videoHeight;
+
+  let ctxDraw = canvas.getContext("2d");
+  ctxDraw.drawImage(video, 0, 0);
+  sendAsyncMessage("ContextMenu:SaveVideoFrameAsImage:Result", {
+    dataURL: canvas.toDataURL("image/jpeg", ""),
+  });
+});
+
+addMessageListener("ContextMenu:MediaCommand", (message) => {
+  E10SUtils.wrapHandlingUserInput(
+    content, message.data.handlingUserInput,
+    () => {
+      let media = message.objects.element;
+      switch (message.data.command) {
+        case "play":
+          media.play();
+          break;
+        case "pause":
+          media.pause();
+          break;
+        case "loop":
+          media.loop = !media.loop;
+          break;
+        case "mute":
+          media.muted = true;
+          break;
+        case "unmute":
+          media.muted = false;
+          break;
+        case "playbackRate":
+          media.playbackRate = message.data.data;
+          break;
+        case "hidecontrols":
+          media.removeAttribute("controls");
+          break;
+        case "showcontrols":
+          media.setAttribute("controls", "true");
+          break;
+        case "fullscreen":
+          if (content.document.fullscreenEnabled)
+            media.requestFullscreen();
+          break;
+      }
+    });
+});
+
+addMessageListener("ContextMenu:Canvas:ToBlobURL", (message) => {
+  message.objects.target.toBlob((blob) => {
+    let blobURL = URL.createObjectURL(blob);
+    sendAsyncMessage("ContextMenu:Canvas:ToBlobURL:Result", { blobURL });
+  });
+});
+
+addMessageListener("ContextMenu:ReloadFrame", (message) => {
+  message.objects.target.ownerDocument.location.reload();
+});
+
+addMessageListener("ContextMenu:ReloadImage", (message) => {
+  let image = message.objects.target;
+  if (image instanceof Ci.nsIImageLoadingContent)
+    image.forceReload();
+});
+
+addMessageListener("ContextMenu:BookmarkFrame", (message) => {
+  let frame = message.objects.target.ownerDocument;
+  sendAsyncMessage("ContextMenu:BookmarkFrame:Result",
+                   { title: frame.title,
+                     description: PlacesUIUtils.getDescriptionFromDocument(frame) });
+});
+
+addMessageListener("ContextMenu:SearchFieldBookmarkData", (message) => {
+  let node = message.objects.target;
+
+  let charset = node.ownerDocument.characterSet;
+
+  let formBaseURI = BrowserUtils.makeURI(node.form.baseURI,
+                                         charset);
+
+  let formURI = BrowserUtils.makeURI(node.form.getAttribute("action"),
+                                     charset,
+                                     formBaseURI);
+
+  let spec = formURI.spec;
+
+  let isURLEncoded =
+               (node.form.method.toUpperCase() == "POST"
+                && (node.form.enctype == "application/x-www-form-urlencoded" ||
+                    node.form.enctype == ""));
+
+  let title = node.ownerDocument.title;
+  let description = PlacesUIUtils.getDescriptionFromDocument(node.ownerDocument);
+
+  let formData = [];
+
+  function escapeNameValuePair(aName, aValue, aIsFormUrlEncoded) {
+    if (aIsFormUrlEncoded) {
+      return escape(aName + "=" + aValue);
+    }
+    return escape(aName) + "=" + escape(aValue);
+  }
+
+  for (let el of node.form.elements) {
+    if (!el.type) // happens with fieldsets
+      continue;
+
+    if (el == node) {
+      formData.push((isURLEncoded) ? escapeNameValuePair(el.name, "%s", true) :
+                                     // Don't escape "%s", just append
+                                     escapeNameValuePair(el.name, "", false) + "%s");
+      continue;
+    }
+
+    let type = el.type.toLowerCase();
+
+    if (((el instanceof content.HTMLInputElement && el.mozIsTextField(true)) ||
+        type == "hidden" || type == "textarea") ||
+        ((type == "checkbox" || type == "radio") && el.checked)) {
+      formData.push(escapeNameValuePair(el.name, el.value, isURLEncoded));
+    } else if (el instanceof content.HTMLSelectElement && el.selectedIndex >= 0) {
+      for (let j=0; j < el.options.length; j++) {
+        if (el.options[j].selected)
+          formData.push(escapeNameValuePair(el.name, el.options[j].value,
+                                            isURLEncoded));
+      }
+    }
+  }
+
+  let postData;
+
+  if (isURLEncoded)
+    postData = formData.join("&");
+  else {
+    let separator = spec.includes("?") ? "&" : "?";
+    spec += separator + formData.join("&");
+  }
+
+  sendAsyncMessage("ContextMenu:SearchFieldBookmarkData:Result",
+                   { spec, title, description, postData, charset });
+});
+
+addMessageListener("Bookmarks:GetPageDetails", (message) => {
+  let doc = content.document;
+  let isErrorPage = /^about:(neterror|certerror|blocked)/.test(doc.documentURI);
+  sendAsyncMessage("Bookmarks:GetPageDetails:Result",
+                   { isErrorPage: isErrorPage,
+                     description: PlacesUIUtils.getDescriptionFromDocument(doc) });
+});
+
+var LightWeightThemeWebInstallListener = {
+  _previewWindow: null,
+
+  init: function() {
+    addEventListener("InstallBrowserTheme", this, false, true);
+    addEventListener("PreviewBrowserTheme", this, false, true);
+    addEventListener("ResetBrowserThemePreview", this, false, true);
+  },
+
+  handleEvent: function (event) {
+    switch (event.type) {
+      case "InstallBrowserTheme": {
+        sendAsyncMessage("LightWeightThemeWebInstaller:Install", {
+          baseURI: event.target.baseURI,
+          themeData: event.target.getAttribute("data-browsertheme"),
+        });
+        break;
+      }
+      case "PreviewBrowserTheme": {
+        sendAsyncMessage("LightWeightThemeWebInstaller:Preview", {
+          baseURI: event.target.baseURI,
+          themeData: event.target.getAttribute("data-browsertheme"),
+        });
+        this._previewWindow = event.target.ownerGlobal;
+        this._previewWindow.addEventListener("pagehide", this, true);
+        break;
+      }
+      case "pagehide": {
+        sendAsyncMessage("LightWeightThemeWebInstaller:ResetPreview");
+        this._resetPreviewWindow();
+        break;
+      }
+      case "ResetBrowserThemePreview": {
+        if (this._previewWindow) {
+          sendAsyncMessage("LightWeightThemeWebInstaller:ResetPreview",
+                           {baseURI: event.target.baseURI});
+          this._resetPreviewWindow();
+        }
+        break;
+      }
+    }
+  },
+
+  _resetPreviewWindow: function () {
+    this._previewWindow.removeEventListener("pagehide", this, true);
+    this._previewWindow = null;
+  }
+};
+
+LightWeightThemeWebInstallListener.init();
+
+function disableSetDesktopBackground(aTarget) {
+  // Disable the Set as Desktop Background menu item if we're still trying
+  // to load the image or the load failed.
+  if (!(aTarget instanceof Ci.nsIImageLoadingContent))
+    return true;
+
+  if (("complete" in aTarget) && !aTarget.complete)
+    return true;
+
+  if (aTarget.currentURI.schemeIs("javascript"))
+    return true;
+
+  let request = aTarget.QueryInterface(Ci.nsIImageLoadingContent)
+                       .getRequest(Ci.nsIImageLoadingContent.CURRENT_REQUEST);
+  if (!request)
+    return true;
+
+  return false;
+}
+
+addMessageListener("ContextMenu:SetAsDesktopBackground", (message) => {
+  let target = message.objects.target;
+
+  // Paranoia: check disableSetDesktopBackground again, in case the
+  // image changed since the context menu was initiated.
+  let disable = disableSetDesktopBackground(target);
+
+  if (!disable) {
+    try {
+      BrowserUtils.urlSecurityCheck(target.currentURI.spec, target.ownerDocument.nodePrincipal);
+      let canvas = content.document.createElement("canvas");
+      canvas.width = target.naturalWidth;
+      canvas.height = target.naturalHeight;
+      let ctx = canvas.getContext("2d");
+      ctx.drawImage(target, 0, 0);
+      let dataUrl = canvas.toDataURL();
+      sendAsyncMessage("ContextMenu:SetAsDesktopBackground:Result",
+                       { dataUrl });
+    }
+    catch (e) {
+      Cu.reportError(e);
+      disable = true;
+    }
+  }
+
+  if (disable)
+    sendAsyncMessage("ContextMenu:SetAsDesktopBackground:Result", { disable });
+});
+
+var PageInfoListener = {
+
+  init: function() {
+    addMessageListener("PageInfo:getData", this);
+  },
+
+  receiveMessage: function(message) {
+    let strings = message.data.strings;
+    let window;
+    let document;
+
+    let frameOuterWindowID = message.data.frameOuterWindowID;
+
+    // If inside frame then get the frame's window and document.
+    if (frameOuterWindowID) {
+      window = Services.wm.getOuterWindowWithId(frameOuterWindowID);
+      document = window.document;
+    }
+    else {
+      window = content.window;
+      document = content.document;
+    }
+
+    let imageElement = message.objects.imageElement;
+
+    let pageInfoData = {metaViewRows: this.getMetaInfo(document),
+                        docInfo: this.getDocumentInfo(document),
+                        feeds: this.getFeedsInfo(document, strings),
+                        windowInfo: this.getWindowInfo(window),
+                        imageInfo: this.getImageInfo(imageElement)};
+
+    sendAsyncMessage("PageInfo:data", pageInfoData);
+
+    // Separate step so page info dialog isn't blank while waiting for this to finish.
+    this.getMediaInfo(document, window, strings);
+  },
+
+  getImageInfo: function(imageElement) {
+    let imageInfo = null;
+    if (imageElement) {
+      imageInfo = {
+        currentSrc: imageElement.currentSrc,
+        width: imageElement.width,
+        height: imageElement.height,
+        imageText: imageElement.title || imageElement.alt
+      };
+    }
+    return imageInfo;
+  },
+
+  getMetaInfo: function(document) {
+    let metaViewRows = [];
+
+    // Get the meta tags from the page.
+    let metaNodes = document.getElementsByTagName("meta");
+
+    for (let metaNode of metaNodes) {
+      metaViewRows.push([metaNode.name || metaNode.httpEquiv || metaNode.getAttribute("property"),
+                        metaNode.content]);
+    }
+
+    return metaViewRows;
+  },
+
+  getWindowInfo: function(window) {
+    let windowInfo = {};
+    windowInfo.isTopWindow = window == window.top;
+
+    let hostName = null;
+    try {
+      hostName = window.location.host;
+    }
+    catch (exception) { }
+
+    windowInfo.hostName = hostName;
+    return windowInfo;
+  },
+
+  getDocumentInfo: function(document) {
+    let docInfo = {};
+    docInfo.title = document.title;
+    docInfo.location = document.location.toString();
+    docInfo.referrer = document.referrer;
+    docInfo.compatMode = document.compatMode;
+    docInfo.contentType = document.contentType;
+    docInfo.characterSet = document.characterSet;
+    docInfo.lastModified = document.lastModified;
+    docInfo.principal = document.nodePrincipal;
+
+    let documentURIObject = {};
+    documentURIObject.spec = document.documentURIObject.spec;
+    documentURIObject.originCharset = document.documentURIObject.originCharset;
+    docInfo.documentURIObject = documentURIObject;
+
+    docInfo.isContentWindowPrivate = PrivateBrowsingUtils.isContentWindowPrivate(content);
+
+    return docInfo;
+  },
+
+  getFeedsInfo: function(document, strings) {
+    let feeds = [];
+    // Get the feeds from the page.
+    let linkNodes = document.getElementsByTagName("link");
+    let length = linkNodes.length;
+    for (let i = 0; i < length; i++) {
+      let link = linkNodes[i];
+      if (!link.href) {
+        continue;
+      }
+      let rel = link.rel && link.rel.toLowerCase();
+      let rels = {};
+
+      if (rel) {
+        for (let relVal of rel.split(/\s+/)) {
+          rels[relVal] = true;
+        }
+      }
+
+      if (rels.feed || (link.type && rels.alternate && !rels.stylesheet)) {
+        let type = Feeds.isValidFeed(link, document.nodePrincipal, "feed" in rels);
+        if (type) {
+          type = strings[type] || strings["application/rss+xml"];
+          feeds.push([link.title, type, link.href]);
+        }
+      }
+    }
+    return feeds;
+  },
+
+  // Only called once to get the media tab's media elements from the content page.
+  getMediaInfo: function(document, window, strings)
+  {
+    let frameList = this.goThroughFrames(document, window);
+    Task.spawn(() => this.processFrames(document, frameList, strings));
+  },
+
+  goThroughFrames: function(document, window)
+  {
+    let frameList = [document];
+    if (window && window.frames.length > 0) {
+      let num = window.frames.length;
+      for (let i = 0; i < num; i++) {
+        // Recurse through the frames.
+        frameList.concat(this.goThroughFrames(window.frames[i].document,
+                                              window.frames[i]));
+      }
+    }
+    return frameList;
+  },
+
+  processFrames: function*(document, frameList, strings)
+  {
+    let nodeCount = 0;
+    for (let doc of frameList) {
+      let iterator = doc.createTreeWalker(doc, content.NodeFilter.SHOW_ELEMENT);
+
+      // Goes through all the elements on the doc. imageViewRows takes only the media elements.
+      while (iterator.nextNode()) {
+        let mediaItems = this.getMediaItems(document, strings, iterator.currentNode);
+
+        if (mediaItems.length) {
+          sendAsyncMessage("PageInfo:mediaData",
+                           {mediaItems, isComplete: false});
+        }
+
+        if (++nodeCount % 500 == 0) {
+          // setTimeout every 500 elements so we don't keep blocking the content process.
+          yield new Promise(resolve => setTimeout(resolve, 10));
+        }
+      }
+    }
+    // Send that page info media fetching has finished.
+    sendAsyncMessage("PageInfo:mediaData", {isComplete: true});
+  },
+
+  getMediaItems: function(document, strings, elem)
+  {
+    // Check for images defined in CSS (e.g. background, borders)
+    let computedStyle = elem.ownerGlobal.getComputedStyle(elem);
+    // A node can have multiple media items associated with it - for example,
+    // multiple background images.
+    let mediaItems = [];
+
+    let addImage = (url, type, alt, elem, isBg) => {
+      let element = this.serializeElementInfo(document, url, type, alt, elem, isBg);
+      mediaItems.push([url, type, alt, element, isBg]);
+    };
+
+    if (computedStyle) {
+      let addImgFunc = (label, val) => {
+        if (val.primitiveType == content.CSSPrimitiveValue.CSS_URI) {
+          addImage(val.getStringValue(), label, strings.notSet, elem, true);
+        }
+        else if (val.primitiveType == content.CSSPrimitiveValue.CSS_STRING) {
+          // This is for -moz-image-rect.
+          // TODO: Reimplement once bug 714757 is fixed.
+          let strVal = val.getStringValue();
+          if (strVal.search(/^.*url\(\"?/) > -1) {
+            let url = strVal.replace(/^.*url\(\"?/, "").replace(/\"?\).*$/, "");
+            addImage(url, label, strings.notSet, elem, true);
+          }
+        }
+        else if (val.cssValueType == content.CSSValue.CSS_VALUE_LIST) {
+          // Recursively resolve multiple nested CSS value lists.
+          for (let i = 0; i < val.length; i++) {
+            addImgFunc(label, val.item(i));
+          }
+        }
+      };
+
+      addImgFunc(strings.mediaBGImg, computedStyle.getPropertyCSSValue("background-image"));
+      addImgFunc(strings.mediaBorderImg, computedStyle.getPropertyCSSValue("border-image-source"));
+      addImgFunc(strings.mediaListImg, computedStyle.getPropertyCSSValue("list-style-image"));
+      addImgFunc(strings.mediaCursor, computedStyle.getPropertyCSSValue("cursor"));
+    }
+
+    // One swi^H^H^Hif-else to rule them all.
+    if (elem instanceof content.HTMLImageElement) {
+      addImage(elem.src, strings.mediaImg,
+               (elem.hasAttribute("alt")) ? elem.alt : strings.notSet, elem, false);
+    }
+    else if (elem instanceof content.SVGImageElement) {
+      try {
+        // Note: makeURLAbsolute will throw if either the baseURI is not a valid URI
+        //       or the URI formed from the baseURI and the URL is not a valid URI.
+        if (elem.href.baseVal) {
+          let href = Services.io.newURI(elem.href.baseVal, null, Services.io.newURI(elem.baseURI)).spec;
+          addImage(href, strings.mediaImg, "", elem, false);
+        }
+      } catch (e) { }
+    }
+    else if (elem instanceof content.HTMLVideoElement) {
+      addImage(elem.currentSrc, strings.mediaVideo, "", elem, false);
+    }
+    else if (elem instanceof content.HTMLAudioElement) {
+      addImage(elem.currentSrc, strings.mediaAudio, "", elem, false);
+    }
+    else if (elem instanceof content.HTMLLinkElement) {
+      if (elem.rel && /\bicon\b/i.test(elem.rel)) {
+        addImage(elem.href, strings.mediaLink, "", elem, false);
+      }
+    }
+    else if (elem instanceof content.HTMLInputElement || elem instanceof content.HTMLButtonElement) {
+      if (elem.type.toLowerCase() == "image") {
+        addImage(elem.src, strings.mediaInput,
+                 (elem.hasAttribute("alt")) ? elem.alt : strings.notSet, elem, false);
+      }
+    }
+    else if (elem instanceof content.HTMLObjectElement) {
+      addImage(elem.data, strings.mediaObject, this.getValueText(elem), elem, false);
+    }
+    else if (elem instanceof content.HTMLEmbedElement) {
+      addImage(elem.src, strings.mediaEmbed, "", elem, false);
+    }
+
+    return mediaItems;
+  },
+
+  /**
+   * Set up a JSON element object with all the instanceOf and other infomation that
+   * makePreview in pageInfo.js uses to figure out how to display the preview.
+   */
+
+  serializeElementInfo: function(document, url, type, alt, item, isBG)
+  {
+    let result = {};
+
+    let imageText;
+    if (!isBG &&
+        !(item instanceof content.SVGImageElement) &&
+        !(document instanceof content.ImageDocument)) {
+      imageText = item.title || item.alt;
+
+      if (!imageText && !(item instanceof content.HTMLImageElement)) {
+        imageText = this.getValueText(item);
+      }
+    }
+
+    result.imageText = imageText;
+    result.longDesc = item.longDesc;
+    result.numFrames = 1;
+
+    if (item instanceof content.HTMLObjectElement ||
+      item instanceof content.HTMLEmbedElement ||
+      item instanceof content.HTMLLinkElement) {
+      result.mimeType = item.type;
+    }
+
+    if (!result.mimeType && !isBG && item instanceof Ci.nsIImageLoadingContent) {
+      // Interface for image loading content.
+      let imageRequest = item.getRequest(Ci.nsIImageLoadingContent.CURRENT_REQUEST);
+      if (imageRequest) {
+        result.mimeType = imageRequest.mimeType;
+        let image = !(imageRequest.imageStatus & imageRequest.STATUS_ERROR) && imageRequest.image;
+        if (image) {
+          result.numFrames = image.numFrames;
+        }
+      }
+    }
+
+    // If we have a data url, get the MIME type from the url.
+    if (!result.mimeType && url.startsWith("data:")) {
+      let dataMimeType = /^data:(image\/[^;,]+)/i.exec(url);
+      if (dataMimeType)
+        result.mimeType = dataMimeType[1].toLowerCase();
+    }
+
+    result.HTMLLinkElement = item instanceof content.HTMLLinkElement;
+    result.HTMLInputElement = item instanceof content.HTMLInputElement;
+    result.HTMLImageElement = item instanceof content.HTMLImageElement;
+    result.HTMLObjectElement = item instanceof content.HTMLObjectElement;
+    result.SVGImageElement = item instanceof content.SVGImageElement;
+    result.HTMLVideoElement = item instanceof content.HTMLVideoElement;
+    result.HTMLAudioElement = item instanceof content.HTMLAudioElement;
+
+    if (isBG) {
+      // Items that are showing this image as a background
+      // image might not necessarily have a width or height,
+      // so we'll dynamically generate an image and send up the
+      // natural dimensions.
+      let img = content.document.createElement("img");
+      img.src = url;
+      result.naturalWidth = img.naturalWidth;
+      result.naturalHeight = img.naturalHeight;
+    } else {
+      // Otherwise, we can use the current width and height
+      // of the image.
+      result.width = item.width;
+      result.height = item.height;
+    }
+
+    if (item instanceof content.SVGImageElement) {
+      result.SVGImageElementWidth = item.width.baseVal.value;
+      result.SVGImageElementHeight = item.height.baseVal.value;
+    }
+
+    result.baseURI = item.baseURI;
+
+    return result;
+  },
+
+  // Other Misc Stuff
+  // Modified from the Links Panel v2.3, http://segment7.net/mozilla/links/links.html
+  // parse a node to extract the contents of the node
+  getValueText: function(node)
+  {
+
+    let valueText = "";
+
+    // Form input elements don't generally contain information that is useful to our callers, so return nothing.
+    if (node instanceof content.HTMLInputElement ||
+        node instanceof content.HTMLSelectElement ||
+        node instanceof content.HTMLTextAreaElement) {
+      return valueText;
+    }
+
+    // Otherwise recurse for each child.
+    let length = node.childNodes.length;
+
+    for (let i = 0; i < length; i++) {
+      let childNode = node.childNodes[i];
+      let nodeType = childNode.nodeType;
+
+      // Text nodes are where the goods are.
+      if (nodeType == content.Node.TEXT_NODE) {
+        valueText += " " + childNode.nodeValue;
+      }
+      // And elements can have more text inside them.
+      else if (nodeType == content.Node.ELEMENT_NODE) {
+        // Images are special, we want to capture the alt text as if the image weren't there.
+        if (childNode instanceof content.HTMLImageElement) {
+          valueText += " " + this.getAltText(childNode);
+        }
+        else {
+          valueText += " " + this.getValueText(childNode);
+        }
+      }
+    }
+
+    return this.stripWS(valueText);
+  },
+
+  // Copied from the Links Panel v2.3, http://segment7.net/mozilla/links/links.html.
+  // Traverse the tree in search of an img or area element and grab its alt tag.
+  getAltText: function(node)
+  {
+    let altText = "";
+
+    if (node.alt) {
+      return node.alt;
+    }
+    let length = node.childNodes.length;
+    for (let i = 0; i < length; i++) {
+      if ((altText = this.getAltText(node.childNodes[i]) != undefined)) { // stupid js warning...
+        return altText;
+      }
+    }
+    return "";
+  },
+
+  // Copied from the Links Panel v2.3, http://segment7.net/mozilla/links/links.html.
+  // Strip leading and trailing whitespace, and replace multiple consecutive whitespace characters with a single space.
+  stripWS: function(text)
+  {
+    let middleRE = /\s+/g;
+    let endRE = /(^\s+)|(\s+$)/g;
+
+    text = text.replace(middleRE, " ");
+    return text.replace(endRE, "");
+  }
+};
+PageInfoListener.init();
+
+let OfflineApps = {
+  _docId: 0,
+  _docIdMap: new Map(),
+
+  _docManifestSet: new Set(),
+
+  _observerAdded: false,
+  registerWindow(aWindow) {
+    if (!this._observerAdded) {
+      this._observerAdded = true;
+      Services.obs.addObserver(this, "offline-cache-update-completed", true);
+    }
+    let manifestURI = this._getManifestURI(aWindow);
+    this._docManifestSet.add(manifestURI.spec);
+  },
+
+  handleEvent(event) {
+    if (event.type == "MozApplicationManifest") {
+      this.offlineAppRequested(event.originalTarget.defaultView);
+    }
+  },
+
+  _getManifestURI(aWindow) {
+    if (!aWindow.document.documentElement)
+      return null;
+
+    var attr = aWindow.document.documentElement.getAttribute("manifest");
+    if (!attr)
+      return null;
+
+    try {
+      var contentURI = BrowserUtils.makeURI(aWindow.location.href, null, null);
+      return BrowserUtils.makeURI(attr, aWindow.document.characterSet, contentURI);
+    } catch (e) {
+      return null;
+    }
+  },
+
+  offlineAppRequested(aContentWindow) {
+    this.registerWindow(aContentWindow);
+    if (!Services.prefs.getBoolPref("browser.offline-apps.notify")) {
+      return;
+    }
+
+    let currentURI = aContentWindow.document.documentURIObject;
+    // don't bother showing UI if the user has already made a decision
+    if (Services.perms.testExactPermission(currentURI, "offline-app") != Services.perms.UNKNOWN_ACTION)
+      return;
+
+    try {
+      if (Services.prefs.getBoolPref("offline-apps.allow_by_default")) {
+        // all pages can use offline capabilities, no need to ask the user
+        return;
+      }
+    } catch (e) {
+      // this pref isn't set by default, ignore failures
+    }
+    let docId = ++this._docId;
+    this._docIdMap.set(docId, Cu.getWeakReference(aContentWindow.document));
+    sendAsyncMessage("OfflineApps:RequestPermission", {
+      uri: currentURI.spec,
+      docId,
+    });
+  },
+
+  _startFetching(aDocument) {
+    if (!aDocument.documentElement)
+      return;
+
+    let manifestURI = this._getManifestURI(aDocument.defaultView);
+    if (!manifestURI)
+      return;
+
+    var updateService = Cc["@mozilla.org/offlinecacheupdate-service;1"].
+                        getService(Ci.nsIOfflineCacheUpdateService);
+    updateService.scheduleUpdate(manifestURI, aDocument.documentURIObject,
+                                 aDocument.nodePrincipal, aDocument.defaultView);
+  },
+
+  receiveMessage(aMessage) {
+    if (aMessage.name == "OfflineApps:StartFetching") {
+      let doc = this._docIdMap.get(aMessage.data.docId);
+      doc = doc && doc.get();
+      if (doc) {
+        this._startFetching(doc);
+      }
+      this._docIdMap.delete(aMessage.data.docId);
+    }
+  },
+
+  observe(aSubject, aTopic, aState) {
+    if (aTopic == "offline-cache-update-completed") {
+      let cacheUpdate = aSubject.QueryInterface(Ci.nsIOfflineCacheUpdate);
+      let uri = cacheUpdate.manifestURI;
+      if (uri && this._docManifestSet.has(uri.spec)) {
+        sendAsyncMessage("OfflineApps:CheckUsage", {uri: uri.spec});
+      }
+    }
+  },
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver,
+                                         Ci.nsISupportsWeakReference]),
+};
+
+addEventListener("MozApplicationManifest", OfflineApps, false);
+addMessageListener("OfflineApps:StartFetching", OfflineApps);