initial commit

1 files changed, 1603 insertions, 0 deletions

diff --git a/base/content/nsContextMenu.js b/base/content/nsContextMenu.js
new file mode 100644
index 0000000..916dd26
--- /dev/null
+++ b/base/content/nsContextMenu.js
@@ -0,0 +1,1603 @@
+# 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://gre/modules/PrivateBrowsingUtils.jsm");
+
+var gContextMenuContentData = null;
+
+function nsContextMenu(aXulMenu, aIsShift) {
+  this.shouldDisplay = true;
+  this.initMenu(aXulMenu, aIsShift);
+}
+
+// Prototype for nsContextMenu "class."
+nsContextMenu.prototype = {
+  initMenu: function CM_initMenu(aXulMenu, aIsShift) {
+    // Get contextual info.
+    this.setTarget(document.popupNode, document.popupRangeParent,
+                   document.popupRangeOffset);
+    if (!this.shouldDisplay)
+      return;
+
+    this.hasPageMenu = false;
+    if (!aIsShift) {
+      this.hasPageMenu = PageMenu.maybeBuildAndAttachMenu(this.target,
+                                                          aXulMenu);
+    }
+
+    this.isFrameImage = document.getElementById("isFrameImage");
+    this.ellipsis = "\u2026";
+    try {
+      this.ellipsis = gPrefService.getComplexValue("intl.ellipsis",
+                                                   Ci.nsIPrefLocalizedString).data;
+    } catch (e) { }
+
+    this.isContentSelected = this.isContentSelection();
+    this.onPlainTextLink = false;
+
+    // Initialize (disable/remove) menu items.
+    this.initItems();
+  },
+
+  hiding: function CM_hiding() {
+    gContextMenuContentData = null;
+    InlineSpellCheckerUI.clearSuggestionsFromMenu();
+    InlineSpellCheckerUI.clearDictionaryListFromMenu();
+    InlineSpellCheckerUI.uninit();
+  },
+
+  initItems: function CM_initItems() {
+    this.initPageMenuSeparator();
+    this.initOpenItems();
+    this.initNavigationItems();
+    this.initViewItems();
+    this.initMiscItems();
+    this.initSpellingItems();
+    this.initSaveItems();
+    this.initClipboardItems();
+    this.initMediaPlayerItems();
+    this.initLeaveDOMFullScreenItems();
+    this.initClickToPlayItems();
+  },
+
+  initPageMenuSeparator: function CM_initPageMenuSeparator() {
+    this.showItem("page-menu-separator", this.hasPageMenu);
+  },
+
+  initOpenItems: function CM_initOpenItems() {
+    var isMailtoInternal = false;
+    if (this.onMailtoLink) {
+      var mailtoHandler = Cc["@mozilla.org/uriloader/external-protocol-service;1"].
+                          getService(Ci.nsIExternalProtocolService).
+                          getProtocolHandlerInfo("mailto");
+      isMailtoInternal = (!mailtoHandler.alwaysAskBeforeHandling &&
+                          mailtoHandler.preferredAction == Ci.nsIHandlerInfo.useHelperApp &&
+                          (mailtoHandler.preferredApplicationHandler instanceof Ci.nsIWebHandlerApp));
+    }
+
+    // Time to do some bad things and see if we've highlighted a URL that
+    // isn't actually linked.
+    if (this.isTextSelected && !this.onLink) {
+      // Ok, we have some text, let's figure out if it looks like a URL.
+      let selection =  document.commandDispatcher.focusedWindow
+                               .getSelection();
+      let linkText = selection.toString().trim();
+      let uri;
+      if (/^(?:https?|ftp):/i.test(linkText)) {
+        try {
+          uri = makeURI(linkText);
+        } catch (ex) {}
+      }
+      // Check if this could be a valid url, just missing the protocol.
+      else if (/^[-a-z\d\.]+\.[-a-z\d]{2,}[-_=~:#%&\?\w\/\.]*$/i.test(linkText)) {
+        let uriFixup = Cc["@mozilla.org/docshell/urifixup;1"]
+                         .getService(Ci.nsIURIFixup);
+        try {
+          uri = uriFixup.createFixupURI(linkText, uriFixup.FIXUP_FLAG_NONE);
+        } catch (ex) {}
+      }
+
+      if (uri && uri.host) {
+        this.linkURI = uri;
+        this.linkURL = this.linkURI.spec;
+        this.onPlainTextLink = true;
+      }
+    }
+
+    var shouldShow = this.onSaveableLink || isMailtoInternal || this.onPlainTextLink;
+    var isWindowPrivate = PrivateBrowsingUtils.isWindowPrivate(window);
+    this.showItem("context-openlink", shouldShow && !isWindowPrivate);
+    this.showItem("context-openlinkprivate", shouldShow);
+    this.showItem("context-openlinkintab", shouldShow);
+    this.showItem("context-openlinkincurrent", shouldShow);
+    this.showItem("context-sep-open", shouldShow);
+  },
+
+  initNavigationItems: function CM_initNavigationItems() {
+    var shouldShow = !(this.isContentSelected || this.onLink || this.onImage ||
+                       this.onCanvas || this.onVideo || this.onAudio ||
+                       this.onTextInput);
+    this.showItem("context-back", shouldShow);
+    this.showItem("context-forward", shouldShow);
+
+    let stopped = XULBrowserWindow.stopCommand.getAttribute("disabled") == "true";
+
+    let stopReloadItem = "";
+    if (shouldShow) {
+      stopReloadItem = stopped ? "reload" : "stop";
+    }
+
+    this.showItem("context-reload", stopReloadItem == "reload");
+    this.showItem("context-stop", stopReloadItem == "stop");
+    this.showItem("context-sep-stop", !!stopReloadItem);
+
+    // XXX: Stop is determined in browser.js; the canStop broadcaster is broken
+    //this.setItemAttrFromNode( "context-stop", "disabled", "canStop" );
+  },
+
+  initLeaveDOMFullScreenItems: function CM_initLeaveFullScreenItem() {
+    // only show the option if the user is in DOM fullscreen
+    var shouldShow = (this.target.ownerDocument.mozFullScreenElement != null);
+    this.showItem("context-leave-dom-fullscreen", shouldShow);
+
+    // Explicitly show if in DOM fullscreen, but do not hide it has already been shown
+    if (shouldShow)
+        this.showItem("context-media-sep-commands", true);
+  },
+
+  initSaveItems: function CM_initSaveItems() {
+    var shouldShow = !(this.onTextInput || this.onLink ||
+                       this.isContentSelected || this.onImage ||
+                       this.onCanvas || this.onVideo || this.onAudio);
+    this.showItem("context-savepage", shouldShow);
+    this.showItem("context-sendpage", shouldShow);
+
+    // Save+Send link depends on whether we're in a link, or selected text matches valid URL pattern.
+    this.showItem("context-savelink", this.onSaveableLink || this.onPlainTextLink);
+    this.showItem("context-sendlink", this.onSaveableLink || this.onPlainTextLink);
+
+    // Save image depends on having loaded its content, video and audio don't.
+    this.showItem("context-saveimage", this.onLoadedImage || this.onCanvas);
+    this.showItem("context-savevideo", this.onVideo);
+    this.showItem("context-saveaudio", this.onAudio);
+    this.showItem("context-video-saveimage", this.onVideo);
+    this.setItemAttr("context-savevideo", "disabled", !this.mediaURL);
+    this.setItemAttr("context-saveaudio", "disabled", !this.mediaURL);
+    // Send media URL (but not for canvas, since it's a big data: URL)
+    this.showItem("context-sendimage", this.onImage);
+    this.showItem("context-sendvideo", this.onVideo);
+    this.showItem("context-sendaudio", this.onAudio);
+    this.setItemAttr("context-sendvideo", "disabled", !this.mediaURL);
+    this.setItemAttr("context-sendaudio", "disabled", !this.mediaURL);
+  },
+
+  initViewItems: function CM_initViewItems() {
+    // View source is always OK, unless in directory listing.
+    this.showItem("context-viewpartialsource-selection",
+                  this.isContentSelected);
+    this.showItem("context-viewpartialsource-mathml",
+                  this.onMathML && !this.isContentSelected);
+
+    var shouldShow = !(this.isContentSelected ||
+                       this.onImage || this.onCanvas ||
+                       this.onVideo || this.onAudio ||
+                       this.onLink || this.onTextInput);
+    this.showItem("context-viewsource", shouldShow);
+    this.showItem("context-viewinfo", shouldShow);
+#ifdef MOZ_DEVTOOLS
+    var showInspect = gPrefService.getBoolPref("devtools.inspector.enabled");
+    this.showItem("inspect-separator", showInspect);
+    this.showItem("context-inspect", showInspect);
+#endif
+
+    this.showItem("context-sep-viewsource", shouldShow);
+
+    // Set as Desktop background depends on whether an image was clicked on,
+    // and only works if we have a shell service.
+    var haveSetDesktopBackground = false;
+#ifdef HAVE_SHELL_SERVICE
+    // Only enable Set as Desktop Background if we can get the shell service.
+    var shell = getShellService();
+    if (shell)
+      haveSetDesktopBackground = shell.canSetDesktopBackground;
+#endif
+    this.showItem("context-setDesktopBackground",
+                  haveSetDesktopBackground && this.onLoadedImage);
+
+    if (haveSetDesktopBackground && this.onLoadedImage) {
+      document.getElementById("context-setDesktopBackground")
+              .disabled = this.disableSetDesktopBackground();
+    }
+
+    // Reload image depends on an image that's not fully loaded
+    this.showItem("context-reloadimage", (this.onImage && !this.onCompletedImage));
+
+    // View image depends on having an image that's not standalone
+    // (or is in a frame), or a canvas.
+    this.showItem("context-viewimage", (this.onImage &&
+                  (!this.inSyntheticDoc || this.inFrame)) || this.onCanvas);
+
+    // View video depends on not having a standalone video.
+    this.showItem("context-viewvideo", this.onVideo && (!this.inSyntheticDoc || this.inFrame));
+    this.setItemAttr("context-viewvideo",  "disabled", !this.mediaURL);
+
+    // View background image depends on whether there is one, but don't make
+    // background images of a stand-alone media document available.
+    this.showItem("context-viewbgimage", shouldShow &&
+                                         !this._hasMultipleBGImages &&
+                                         !this.inSyntheticDoc);
+    this.showItem("context-sep-viewbgimage", shouldShow &&
+                                             !this._hasMultipleBGImages &&
+                                             !this.inSyntheticDoc);
+    document.getElementById("context-viewbgimage")
+            .disabled = !this.hasBGImage;
+
+    this.showItem("context-viewimageinfo", this.onImage);
+  },
+
+  initMiscItems: function CM_initMiscItems() {
+    // Use "Bookmark This Link" if on a link.
+    this.showItem("context-bookmarkpage",
+                  !(this.isContentSelected || this.onTextInput || this.onLink ||
+                    this.onImage || this.onVideo || this.onAudio));
+    this.showItem("context-bookmarklink", (this.onLink && !this.onMailtoLink) ||
+                                          this.onPlainTextLink);
+    this.showItem("context-keywordfield",
+                  this.onTextInput && this.onKeywordField);
+    this.showItem("frame", this.inFrame);
+
+    let showSearchSelect = (this.isTextSelected || this.onLink) && !this.onImage;
+    this.showItem("context-searchselect", showSearchSelect);
+    if (showSearchSelect) {
+      this.formatSearchContextItem();
+    }
+
+    // srcdoc cannot be opened separately due to concerns about web
+    // content with about:srcdoc in location bar masquerading as trusted
+    // chrome/addon content.
+    // No need to also test for this.inFrame as this is checked in the parent
+    // submenu.
+    this.showItem("context-showonlythisframe", !this.inSrcdocFrame);
+    this.showItem("context-openframeintab", !this.inSrcdocFrame);
+    this.showItem("context-openframe", !this.inSrcdocFrame);
+    this.showItem("context-bookmarkframe", !this.inSrcdocFrame);
+    this.showItem("open-frame-sep", !this.inSrcdocFrame);
+
+    this.showItem("frame-sep", this.inFrame && this.isTextSelected);
+
+    // Hide menu entries for images, show otherwise
+    if (this.inFrame) {
+      if (BrowserUtils.mimeTypeIsTextBased(this.target.ownerDocument.contentType))
+        this.isFrameImage.removeAttribute('hidden');
+      else
+        this.isFrameImage.setAttribute('hidden', 'true');
+    }
+
+    // BiDi UI
+    this.showItem("context-sep-bidi", top.gBidiUI);
+    this.showItem("context-bidi-text-direction-toggle",
+                  this.onTextInput && top.gBidiUI);
+    this.showItem("context-bidi-page-direction-toggle",
+                  !this.onTextInput && top.gBidiUI);
+  },
+
+  initSpellingItems: function() {
+    var canSpell = InlineSpellCheckerUI.canSpellCheck && this.canSpellCheck;
+    var onMisspelling = InlineSpellCheckerUI.overMisspelling;
+    var showUndo = canSpell && InlineSpellCheckerUI.canUndo();
+    this.showItem("spell-check-enabled", canSpell);
+    this.showItem("spell-separator", canSpell || this.onEditableArea);
+    document.getElementById("spell-check-enabled")
+            .setAttribute("checked", canSpell && InlineSpellCheckerUI.enabled);
+
+    this.showItem("spell-add-to-dictionary", onMisspelling);
+    this.showItem("spell-undo-add-to-dictionary", showUndo);
+
+    // suggestion list
+    this.showItem("spell-suggestions-separator", onMisspelling || showUndo);
+    if (onMisspelling) {
+      var suggestionsSeparator =
+        document.getElementById("spell-add-to-dictionary");
+      var numsug =
+        InlineSpellCheckerUI.addSuggestionsToMenu(suggestionsSeparator.parentNode,
+                                                  suggestionsSeparator, 5);
+      this.showItem("spell-no-suggestions", numsug == 0);
+    }
+    else
+      this.showItem("spell-no-suggestions", false);
+
+    // dictionary list
+    this.showItem("spell-dictionaries", canSpell && InlineSpellCheckerUI.enabled);
+    if (canSpell) {
+      var dictMenu = document.getElementById("spell-dictionaries-menu");
+      var dictSep = document.getElementById("spell-language-separator");
+      InlineSpellCheckerUI.addDictionaryListToMenu(dictMenu, dictSep);
+      this.showItem("spell-add-dictionaries-main", false);
+    }
+    else if (this.onEditableArea) {
+      // when there is no spellchecker but we might be able to spellcheck
+      // add the add to dictionaries item. This will ensure that people
+      // with no dictionaries will be able to download them
+      this.showItem("spell-add-dictionaries-main", true);
+    }
+    else
+      this.showItem("spell-add-dictionaries-main", false);
+  },
+
+  initClipboardItems: function() {
+    // Copy depends on whether there is selected text.
+    // Enabling this context menu item is now done through the global
+    // command updating system
+    // this.setItemAttr( "context-copy", "disabled", !this.isTextSelected() );
+    goUpdateGlobalEditMenuItems();
+
+    this.showItem("context-undo", this.onTextInput);
+    this.showItem("context-sep-undo", this.onTextInput);
+    this.showItem("context-cut", this.onTextInput);
+    this.showItem("context-copy",
+                  this.isContentSelected || this.onTextInput);
+    this.showItem("context-paste", this.onTextInput);
+    this.showItem("context-delete", this.onTextInput);
+    this.showItem("context-sep-paste", this.onTextInput);
+    this.showItem("context-selectall", !(this.onLink || this.onImage ||
+                                         this.onVideo || this.onAudio ||
+                                         this.inSyntheticDoc) ||
+                                       this.isDesignMode);
+    this.showItem("context-sep-selectall", this.isContentSelected );
+
+    // XXX dr
+    // ------
+    // nsDocumentViewer.cpp has code to determine whether we're
+    // on a link or an image. we really ought to be using that...
+
+    // Copy email link depends on whether we're on an email link.
+    this.showItem("context-copyemail", this.onMailtoLink);
+
+    // Copy link location depends on whether we're on a non-mailto link.
+    this.showItem("context-copylink", this.onLink && !this.onMailtoLink);
+    this.showItem("context-sep-copylink", this.onLink &&
+                  (this.onImage || this.onVideo || this.onAudio));
+
+#ifdef CONTEXT_COPY_IMAGE_CONTENTS
+    // Copy image contents depends on whether we're on an image.
+    this.showItem("context-copyimage-contents", this.onImage);
+#endif
+    // Copy image location depends on whether we're on an image.
+    this.showItem("context-copyimage", this.onImage);
+    this.showItem("context-copyvideourl", this.onVideo);
+    this.showItem("context-copyaudiourl", this.onAudio);
+    this.setItemAttr("context-copyvideourl",  "disabled", !this.mediaURL);
+    this.setItemAttr("context-copyaudiourl",  "disabled", !this.mediaURL);
+    this.showItem("context-sep-copyimage", this.onImage ||
+                  this.onVideo || this.onAudio);
+  },
+
+  initMediaPlayerItems: function() {
+    var onMedia = (this.onVideo || this.onAudio);
+    // Several mutually exclusive items... play/pause, mute/unmute, show/hide
+    this.showItem("context-media-play",  onMedia && (this.target.paused || this.target.ended));
+    this.showItem("context-media-pause", onMedia && !this.target.paused && !this.target.ended);
+    this.showItem("context-media-mute",   onMedia && !this.target.muted);
+    this.showItem("context-media-unmute", onMedia && this.target.muted);
+    this.showItem("context-media-playbackrate", onMedia);
+    this.showItem("context-media-loop", onMedia);
+    this.showItem("context-media-showcontrols", onMedia && !this.target.controls);
+    this.showItem("context-media-hidecontrols", onMedia && this.target.controls);
+    this.showItem("context-video-fullscreen", this.onVideo && this.target.ownerDocument.mozFullScreenElement == null);
+    var statsShowing = this.onVideo && XPCNativeWrapper.unwrap(this.target).mozMediaStatisticsShowing;
+    this.showItem("context-video-showstats", this.onVideo && this.target.controls && !statsShowing);
+    this.showItem("context-video-hidestats", this.onVideo && this.target.controls && statsShowing);
+
+    // Disable them when there isn't a valid media source loaded.
+    if (onMedia) {
+      this.setItemAttr("context-media-playbackrate-050x", "checked", this.target.playbackRate == 0.5);
+      this.setItemAttr("context-media-playbackrate-100x", "checked", this.target.playbackRate == 1.0);
+      this.setItemAttr("context-media-playbackrate-150x", "checked", this.target.playbackRate == 1.5);
+      this.setItemAttr("context-media-playbackrate-200x", "checked", this.target.playbackRate == 2.0);
+      this.setItemAttr("context-media-loop", "checked", this.target.loop);
+      var hasError = this.target.error != null ||
+                     this.target.networkState == this.target.NETWORK_NO_SOURCE;
+      this.setItemAttr("context-media-play",  "disabled", hasError);
+      this.setItemAttr("context-media-pause", "disabled", hasError);
+      this.setItemAttr("context-media-mute",   "disabled", hasError);
+      this.setItemAttr("context-media-unmute", "disabled", hasError);
+      this.setItemAttr("context-media-playbackrate", "disabled", hasError);
+      this.setItemAttr("context-media-playbackrate-050x", "disabled", hasError);
+      this.setItemAttr("context-media-playbackrate-100x", "disabled", hasError);
+      this.setItemAttr("context-media-playbackrate-150x", "disabled", hasError);
+      this.setItemAttr("context-media-playbackrate-200x", "disabled", hasError);
+      this.setItemAttr("context-media-showcontrols", "disabled", hasError);
+      this.setItemAttr("context-media-hidecontrols", "disabled", hasError);
+      if (this.onVideo) {
+        let canSaveSnapshot = this.target.readyState >= this.target.HAVE_CURRENT_DATA;
+        this.setItemAttr("context-video-saveimage",  "disabled", !canSaveSnapshot);
+        this.setItemAttr("context-video-fullscreen", "disabled", hasError);
+        this.setItemAttr("context-video-showstats", "disabled", hasError);
+        this.setItemAttr("context-video-hidestats", "disabled", hasError);
+      }
+    }
+    this.showItem("context-media-sep-commands",  onMedia);
+  },
+
+  initClickToPlayItems: function() {
+    this.showItem("context-ctp-play", this.onCTPPlugin);
+    this.showItem("context-ctp-hide", this.onCTPPlugin);
+    this.showItem("context-sep-ctp", this.onCTPPlugin);
+  },
+
+  inspectNode: function CM_inspectNode() {
+    let {devtools} = Cu.import("resource://devtools/shared/Loader.jsm", {});
+    let gBrowser = this.browser.ownerDocument.defaultView.gBrowser;
+    let target = devtools.TargetFactory.forTab(gBrowser.selectedTab);
+
+    return gDevTools.showToolbox(target, "inspector").then(function(toolbox) {
+      let inspector = toolbox.getCurrentPanel();
+
+      this.browser.messageManager.sendAsyncMessage("debug:inspect", {}, {node: this.target});
+      inspector.walker.findInspectingNode().then(nodeFront => {
+        inspector.selection.setNodeFront(nodeFront, "browser-context-menu");
+      });
+    }.bind(this));
+  },
+
+  // Set various context menu attributes based on the state of the world.
+  setTarget: function (aNode, aRangeParent, aRangeOffset) {
+    const xulNS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
+    if (aNode.namespaceURI == xulNS ||
+        aNode.nodeType == Node.DOCUMENT_NODE ||
+        this.isDisabledForEvents(aNode)) {
+      this.shouldDisplay = false;
+      return;
+    }
+
+    // Initialize contextual info.
+    this.onImage           = false;
+    this.onLoadedImage     = false;
+    this.onCompletedImage  = false;
+    this.onCanvas          = false;
+    this.onVideo           = false;
+    this.onAudio           = false;
+    this.onTextInput       = false;
+    this.onKeywordField    = false;
+    this.mediaURL          = "";
+    this.onLink            = false;
+    this.onMailtoLink      = false;
+    this.onSaveableLink    = false;
+    this.link              = null;
+    this.linkURL           = "";
+    this.linkURI           = null;
+    this.linkProtocol      = "";
+    this.linkDownload      = "";
+    this.onMathML          = false;
+    this.inFrame           = false;
+    this.inSrcdocFrame     = false;
+    this.inSyntheticDoc    = false;
+    this.hasBGImage        = false;
+    this.bgImageURL        = "";
+    this.onEditableArea    = false;
+    this.isDesignMode      = false;
+    this.onCTPPlugin       = false;
+    this.canSpellCheck     = false;
+    this.textSelected      = getBrowserSelection();
+    this.isTextSelected    = this.textSelected.length != 0;
+
+    // Remember the node that was clicked.
+    this.target = aNode;
+
+    this.browser = this.target.ownerDocument.defaultView
+                                .QueryInterface(Ci.nsIInterfaceRequestor)
+                                .getInterface(Ci.nsIWebNavigation)
+                                .QueryInterface(Ci.nsIDocShell)
+                                .chromeEventHandler;
+
+    // Check if we are in a synthetic document (stand alone image, video, etc.).
+    this.inSyntheticDoc =  this.target.ownerDocument.mozSyntheticDocument;
+    // First, do checks for nodes that never have children.
+    if (this.target.nodeType == Node.ELEMENT_NODE) {
+      // See if the user clicked on an image.
+      if (this.target instanceof Ci.nsIImageLoadingContent &&
+          this.target.currentURI) {
+        this.onImage = true;
+
+        var request =
+          this.target.getRequest(Ci.nsIImageLoadingContent.CURRENT_REQUEST);
+        if (request && (request.imageStatus & request.STATUS_SIZE_AVAILABLE))
+          this.onLoadedImage = true;
+        if (request && (request.imageStatus & request.STATUS_LOAD_COMPLETE))
+          this.onCompletedImage = true;
+
+        this.mediaURL = this.target.currentURI.spec;
+      }
+      else if (this.target instanceof HTMLCanvasElement) {
+        this.onCanvas = true;
+      }
+      else if (this.target instanceof HTMLVideoElement) {
+        this.mediaURL = this.target.currentSrc || this.target.src;
+        // Firefox always creates a HTMLVideoElement when loading an ogg file
+        // directly. If the media is actually audio, be smarter and provide a
+        // context menu with audio operations.
+        if (this.target.readyState >= this.target.HAVE_METADATA &&
+            (this.target.videoWidth == 0 || this.target.videoHeight == 0)) {
+          this.onAudio = true;
+        } else {
+          this.onVideo = true;
+        }
+      }
+      else if (this.target instanceof HTMLAudioElement) {
+        this.onAudio = true;
+        this.mediaURL = this.target.currentSrc || this.target.src;
+      }
+      else if (this.target instanceof HTMLInputElement ) {
+        this.onTextInput = this.isTargetATextBox(this.target);
+        // Allow spellchecking UI on all text and search inputs.
+        if (this.onTextInput && ! this.target.readOnly &&
+            (this.target.type == "text" || this.target.type == "search")) {
+          this.onEditableArea = true;
+          InlineSpellCheckerUI.init(this.target.QueryInterface(Ci.nsIDOMNSEditableElement).editor);
+          InlineSpellCheckerUI.initFromEvent(aRangeParent, aRangeOffset);
+        }
+        this.onKeywordField = this.isTargetAKeywordField(this.target);
+      }
+      else if (this.target instanceof HTMLTextAreaElement) {
+        this.onTextInput = true;
+        if (!this.target.readOnly) {
+          this.onEditableArea = true;
+          InlineSpellCheckerUI.init(this.target.QueryInterface(Ci.nsIDOMNSEditableElement).editor);
+          InlineSpellCheckerUI.initFromEvent(aRangeParent, aRangeOffset);
+        }
+      }
+      else if (this.target instanceof HTMLHtmlElement) {
+        var bodyElt = this.target.ownerDocument.body;
+        if (bodyElt) {
+          let computedURL;
+          try {
+            computedURL = this.getComputedURL(bodyElt, "background-image");
+            this._hasMultipleBGImages = false;
+          } catch (e) {
+            this._hasMultipleBGImages = true;
+          }
+          if (computedURL) {
+            this.hasBGImage = true;
+            this.bgImageURL = makeURLAbsolute(bodyElt.baseURI,
+                                              computedURL);
+          }
+        }
+      }
+      else if ((this.target instanceof HTMLEmbedElement ||
+                this.target instanceof HTMLObjectElement ||
+                this.target instanceof HTMLAppletElement) &&
+               this.target.displayedType == HTMLObjectElement.TYPE_NULL &&
+               this.target.pluginFallbackType == HTMLObjectElement.PLUGIN_CLICK_TO_PLAY) {
+        this.onCTPPlugin = true;
+      }
+
+      this.canSpellCheck = this._isSpellCheckEnabled(this.target);
+    }
+    else if (this.target.nodeType == Node.TEXT_NODE) {
+      // For text nodes, look at the parent node to determine the spellcheck attribute.
+      this.canSpellCheck = this.target.parentNode &&
+                           this._isSpellCheckEnabled(this.target);
+    }
+
+    // Second, bubble out, looking for items of interest that can have childen.
+    // Always pick the innermost link, background image, etc.
+    const XMLNS = "http://www.w3.org/XML/1998/namespace";
+    var elem = this.target;
+    while (elem) {
+      if (elem.nodeType == Node.ELEMENT_NODE) {
+        // Link?
+        if (!this.onLink &&
+            // Be consistent with what hrefAndLinkNodeForClickEvent
+            // does in browser.js
+             ((elem instanceof HTMLAnchorElement && elem.href) ||
+              (elem instanceof HTMLAreaElement && elem.href) ||
+              elem instanceof HTMLLinkElement ||
+              elem.getAttributeNS("http://www.w3.org/1999/xlink", "type") == "simple")) {
+
+          // Target is a link or a descendant of a link.
+          this.onLink = true;
+
+          // Remember corresponding element.
+          this.link = elem;
+          this.linkURL = this.getLinkURL();
+          this.linkURI = this.getLinkURI();
+          this.linkProtocol = this.getLinkProtocol();
+          this.onMailtoLink = (this.linkProtocol == "mailto");
+          this.onSaveableLink = this.isLinkSaveable( this.link );
+          try {
+            if (elem.download) {
+              // Ignore download attribute on cross-origin links?
+              // This shoudn't be an issue because the download link presents
+              // the originating URL domain and protocol to help user understand
+              // from where file is downloaded and make right decision.
+              // If we decide we want this restriction:
+              // this.principal.checkMayLoad(this.linkURI, false, true);
+              this.linkDownload = elem.download;
+            }
+          }
+          catch (ex) {}          
+        }
+
+        // Background image?  Don't bother if we've already found a
+        // background image further down the hierarchy.  Otherwise,
+        // we look for the computed background-image style.
+        if (!this.hasBGImage &&
+            !this._hasMultipleBGImages) {
+          let bgImgUrl;
+          try {
+            bgImgUrl = this.getComputedURL(elem, "background-image");
+            this._hasMultipleBGImages = false;
+          } catch (e) {
+            this._hasMultipleBGImages = true;
+          }
+          if (bgImgUrl) {
+            this.hasBGImage = true;
+            this.bgImageURL = makeURLAbsolute(elem.baseURI,
+                                              bgImgUrl);
+          }
+        }
+      }
+
+      elem = elem.parentNode;
+    }
+
+    // See if the user clicked on MathML
+    const NS_MathML = "http://www.w3.org/1998/Math/MathML";
+    if ((this.target.nodeType == Node.TEXT_NODE &&
+         this.target.parentNode.namespaceURI == NS_MathML)
+         || (this.target.namespaceURI == NS_MathML))
+      this.onMathML = true;
+
+    // See if the user clicked in a frame.
+    var docDefaultView = this.target.ownerDocument.defaultView;
+    if (docDefaultView != docDefaultView.top) {
+      this.inFrame = true;
+
+      if (this.target.ownerDocument.isSrcdocDocument) {
+          this.inSrcdocFrame = true;
+      }
+    }
+
+    // if the document is editable, show context menu like in text inputs
+    if (!this.onEditableArea) {
+      var win = this.target.ownerDocument.defaultView;
+      if (win) {
+        var isEditable = false;
+        try {
+          var editingSession = win.QueryInterface(Ci.nsIInterfaceRequestor)
+                                  .getInterface(Ci.nsIWebNavigation)
+                                  .QueryInterface(Ci.nsIInterfaceRequestor)
+                                  .getInterface(Ci.nsIEditingSession);
+          if (editingSession.windowIsEditable(win) &&
+              this.getComputedStyle(this.target, "-moz-user-modify") == "read-write") {
+            isEditable = true;
+          }
+        }
+        catch(ex) {
+          // If someone built with composer disabled, we can't get an editing session.
+        }
+
+        if (isEditable) {
+          this.onTextInput       = true;
+          this.onKeywordField    = false;
+          this.onImage           = false;
+          this.onLoadedImage     = false;
+          this.onCompletedImage  = false;
+          this.onMathML          = false;
+          this.inFrame           = false;
+          this.inSrcdocFrame     = false;
+          this.hasBGImage        = false;
+          this.isDesignMode      = true;
+          this.onEditableArea = true;
+          InlineSpellCheckerUI.init(editingSession.getEditorForWindow(win));
+          var canSpell = InlineSpellCheckerUI.canSpellCheck && this.canSpellCheck;
+          InlineSpellCheckerUI.initFromEvent(aRangeParent, aRangeOffset);
+          this.showItem("spell-check-enabled", canSpell);
+          this.showItem("spell-separator", canSpell);
+        }
+      }
+    }
+  },
+
+  // Returns the computed style attribute for the given element.
+  getComputedStyle: function(aElem, aProp) {
+    return aElem.ownerDocument
+                .defaultView
+                .getComputedStyle(aElem, "").getPropertyValue(aProp);
+  },
+
+  // Returns a "url"-type computed style attribute value, with the url() stripped.
+  getComputedURL: function(aElem, aProp) {
+    var url = aElem.ownerDocument
+                   .defaultView.getComputedStyle(aElem, "")
+                   .getPropertyCSSValue(aProp);
+    if (url instanceof CSSValueList) {
+      if (url.length != 1)
+        throw "found multiple URLs";
+      url = url[0];
+    }
+    return url.primitiveType == CSSPrimitiveValue.CSS_URI ?
+           url.getStringValue() : null;
+  },
+
+  // Returns true if clicked-on link targets a resource that can be saved.
+  isLinkSaveable: function(aLink) {
+    // We don't do the Right Thing for news/snews yet, so turn them off
+    // until we do.
+    return this.linkProtocol && !(
+             this.linkProtocol == "mailto"     ||
+             this.linkProtocol == "javascript" ||
+             this.linkProtocol == "news"       ||
+             this.linkProtocol == "snews"      );
+  },
+
+  _isSpellCheckEnabled: function(aNode) {
+    // We can always force-enable spellchecking on textboxes
+    if (this.isTargetATextBox(aNode)) {
+      return true;
+    }
+    // We can never spell check something which is not content editable
+    var editable = aNode.isContentEditable;
+    if (!editable && aNode.ownerDocument) {
+      editable = aNode.ownerDocument.designMode == "on";
+    }
+    if (!editable) {
+      return false;
+    }
+    // Otherwise make sure that nothing in the parent chain disables spellchecking
+    return aNode.spellcheck;
+  },
+
+  // Open linked-to URL in a new window.
+  openLink : function () {
+    var doc = this.target.ownerDocument;
+    urlSecurityCheck(this.linkURL, doc.nodePrincipal);
+    openLinkIn(this.linkURL, "window",
+               { charset: doc.characterSet,
+                 referrerURI: doc.documentURIObject,
+                 referrerPolicy: doc.referrerPolicy,
+                 originPrincipal: doc.nodePrincipal,
+                 triggeringPrincipal: doc.nodePrincipal });
+  },
+
+  // Open linked-to URL in a new private window.
+  openLinkInPrivateWindow : function () {
+    var doc = this.target.ownerDocument;
+    urlSecurityCheck(this.linkURL, doc.nodePrincipal);
+    openLinkIn(this.linkURL, "window",
+               { charset: doc.characterSet,
+                 referrerURI: doc.documentURIObject,
+                 referrerPolicy: doc.referrerPolicy,
+                 originPrincipal: doc.nodePrincipal,
+                 triggeringPrincipal: doc.nodePrincipal,
+                 private: true });
+  },
+
+  // Open linked-to URL in a new tab.
+  openLinkInTab: function() {
+    var doc = this.target.ownerDocument;
+    urlSecurityCheck(this.linkURL, doc.nodePrincipal);
+    openLinkIn(this.linkURL, "tab",
+               { charset: doc.characterSet,
+                 referrerURI: doc.documentURIObject,
+                 referrerPolicy: doc.referrerPolicy,
+                 originPrincipal: doc.nodePrincipal,
+                 triggeringPrincipal: doc.nodePrincipal });
+  },
+
+  // open URL in current tab
+  openLinkInCurrent: function() {
+    var doc = this.target.ownerDocument;
+    urlSecurityCheck(this.linkURL, doc.nodePrincipal);
+    openLinkIn(this.linkURL, "current",
+               { charset: doc.characterSet,
+                 referrerURI: doc.documentURIObject,
+                 originPrincipal: doc.nodePrincipal,
+                 triggeringPrincipal: doc.nodePrincipal });
+  },
+
+  // Open frame in a new tab.
+  openFrameInTab: function() {
+    var doc = this.target.ownerDocument;
+    var frameURL = doc.location.href;
+    var referrer = doc.referrer;
+    openLinkIn(frameURL, "tab",
+               { charset: doc.characterSet,
+                 referrerURI: referrer ? makeURI(referrer) : null });
+  },
+
+  // Reload clicked-in frame.
+  reloadFrame: function() {
+    this.target.ownerDocument.location.reload();
+  },
+
+  // Open clicked-in frame in its own window.
+  openFrame: function() {
+    var doc = this.target.ownerDocument;
+    var frameURL = doc.location.href;
+    var referrer = doc.referrer;
+    openLinkIn(frameURL, "window",
+               { charset: doc.characterSet,
+                 referrerURI: referrer ? makeURI(referrer) : null });
+  },
+
+  // Open clicked-in frame in the same window.
+  showOnlyThisFrame: function() {
+    var doc = this.target.ownerDocument;
+    var frameURL = doc.location.href;
+
+    urlSecurityCheck(frameURL, this.browser.contentPrincipal,
+                     Ci.nsIScriptSecurityManager.DISALLOW_SCRIPT);
+    var referrer = doc.referrer;
+    openUILinkIn(frameURL, "current", { disallowInheritPrincipal: true,
+                                        referrerURI: referrer ? makeURI(referrer) : null });
+  },
+
+  reload: function(event) {
+    BrowserReloadOrDuplicate(event);
+  },
+
+  // View Partial Source
+  viewPartialSource: function(aContext) {
+    let target = aContext == "mathml" ? this.target : null;
+    top.gViewSourceUtils.viewPartialSourceInBrowser(gBrowser.selectedBrowser, target);
+  },
+
+  // Open new "view source" window with the frame's URL.
+  viewFrameSource: function() {
+    BrowserViewSourceOfDocument(this.target.ownerDocument);
+  },
+
+  viewInfo: function() {
+    BrowserPageInfo(this.target.ownerDocument.defaultView.top.document);
+  },
+
+  viewImageInfo: function() {
+    BrowserPageInfo(this.target.ownerDocument.defaultView.top.document,
+                    "mediaTab", this.target);
+  },
+
+  viewFrameInfo: function() {
+    BrowserPageInfo(this.target.ownerDocument);
+  },
+
+  reloadImage: function(e) {
+    urlSecurityCheck(this.mediaURL,
+                     this.browser.contentPrincipal,
+                     Ci.nsIScriptSecurityManager.DISALLOW_SCRIPT);
+
+    if (this.target instanceof Ci.nsIImageLoadingContent)
+      this.target.forceReload();
+  },
+
+  // Change current window to the URL of the image, video, or audio.
+  viewMedia: function(e) {
+    var viewURL;
+    var doc = this.target.ownerDocument;
+    if (this.onCanvas) {
+      var target = this.target;
+      var win = doc.defaultView;
+      if (!win) {
+        Components.utils.reportError(
+            "View Image (on the <canvas> element):\n" +
+            "This feature cannot be used, because it hasn't found " + 
+            "an appropriate window.");
+      } else {
+        new Promise.resolve({then: function (resolve) {
+          target.toBlob((blob) => {
+            resolve(win.URL.createObjectURL(blob));
+          })
+        }}).then(function (blobURL) {
+          openUILink(blobURL, e, { disallowInheritPrincipal: true,
+                                   referrerURI: doc.documentURIObject });
+        }, Components.utils.reportError);
+      }
+    } else {
+      viewURL = this.mediaURL;
+      urlSecurityCheck(viewURL,
+                       this.browser.contentPrincipal,
+                       Ci.nsIScriptSecurityManager.DISALLOW_SCRIPT);
+      let doc = this.target.ownerDocument;
+      openUILink(viewURL, e, { disallowInheritPrincipal: true,
+                               referrerURI: doc.documentURIObject,
+                               forceAllowDataURI: true });
+    }
+  },
+
+  saveVideoFrameAsImage: function () {
+    let referrerURI = document.documentURIObject;
+    let isPrivate = PrivateBrowsingUtils.isBrowserPrivate(this.browser);
+
+    urlSecurityCheck(this.mediaURL, this.browser.contentPrincipal,
+                     Ci.nsIScriptSecurityManager.DISALLOW_SCRIPT);
+    let name = "";
+    try {
+      let uri = makeURI(this.mediaURL);
+      let url = uri.QueryInterface(Ci.nsIURL);
+      if (url.fileBaseName)
+        name = decodeURI(url.fileBaseName) + ".jpg";
+    } catch (e) { }
+    if (!name)
+      name = "snapshot.jpg";
+    var video = this.target;
+    var canvas = document.createElementNS("http://www.w3.org/1999/xhtml", "canvas");
+    canvas.width = video.videoWidth;
+    canvas.height = video.videoHeight;
+    var ctxDraw = canvas.getContext("2d");
+    ctxDraw.drawImage(video, 0, 0);
+    saveImageURL(canvas.toDataURL("image/jpeg", ""), name, "SaveImageTitle",
+                 true, false, referrerURI, null, null, null,
+                 isPrivate);
+  },
+
+  fullScreenVideo: function () {
+    let video = this.target;
+    if (document.mozFullScreenEnabled)
+      video.mozRequestFullScreen();
+  },
+
+  leaveDOMFullScreen: function() {
+    document.mozCancelFullScreen();
+  },
+
+  // Change current window to the URL of the background image.
+  viewBGImage: function(e) {
+    urlSecurityCheck(this.bgImageURL,
+                     this.browser.contentPrincipal,
+                     Ci.nsIScriptSecurityManager.DISALLOW_SCRIPT);
+    var doc = this.target.ownerDocument;
+    openUILink(this.bgImageURL, e, { disallowInheritPrincipal: true,
+                                     referrerURI: doc.documentURIObject });
+  },
+
+  disableSetDesktopBackground: function() {
+    // Disable the Set as Desktop Background menu item if we're still trying
+    // to load the image or the load failed.
+    if (!(this.target instanceof Ci.nsIImageLoadingContent))
+      return true;
+
+    if (("complete" in this.target) && !this.target.complete)
+      return true;
+
+    if (this.target.currentURI.schemeIs("javascript"))
+      return true;
+
+    var request = this.target
+                      .QueryInterface(Ci.nsIImageLoadingContent)
+                      .getRequest(Ci.nsIImageLoadingContent.CURRENT_REQUEST);
+    if (!request)
+      return true;
+
+    return false;
+  },
+
+  setDesktopBackground: function() {
+    // Paranoia: check disableSetDesktopBackground again, in case the
+    // image changed since the context menu was initiated.
+    if (this.disableSetDesktopBackground())
+      return;
+
+    urlSecurityCheck(this.target.currentURI.spec,
+                     this.target.ownerDocument.nodePrincipal);
+
+    // Confirm since it's annoying if you hit this accidentally.
+    const kDesktopBackgroundURL = 
+                  "chrome://browser/content/setDesktopBackground.xul";
+#ifdef XP_MACOSX
+    // On Mac, the Set Desktop Background window is not modal.
+    // Don't open more than one Set Desktop Background window.
+    var wm = Components.classes["@mozilla.org/appshell/window-mediator;1"]
+                       .getService(Components.interfaces.nsIWindowMediator);
+    var dbWin = wm.getMostRecentWindow("Shell:SetDesktopBackground");
+    if (dbWin) {
+      dbWin.gSetBackground.init(this.target);
+      dbWin.focus();
+    }
+    else {
+      openDialog(kDesktopBackgroundURL, "",
+                 "centerscreen,chrome,dialog=no,dependent,resizable=no",
+                 this.target);
+    }
+#else
+    // On non-Mac platforms, the Set Wallpaper dialog is modal.
+    openDialog(kDesktopBackgroundURL, "",
+               "centerscreen,chrome,dialog,modal,dependent",
+               this.target);
+#endif
+  },
+
+  // Save URL of clicked-on frame.
+  saveFrame: function () {
+    saveDocument(this.target.ownerDocument);
+  },
+
+  // Helper function to wait for appropriate MIME-type headers and
+  // then prompt the user with a file picker
+  saveHelper: function(linkURL, linkText, dialogTitle, bypassCache, doc,
+                       linkDownload) {
+    // canonical def in nsURILoader.h
+    const NS_ERROR_SAVE_LINK_AS_TIMEOUT = 0x805d0020;
+
+    // an object to proxy the data through to
+    // nsIExternalHelperAppService.doContent, which will wait for the
+    // appropriate MIME-type headers and then prompt the user with a
+    // file picker
+    function saveAsListener() {}
+    saveAsListener.prototype = {
+      extListener: null, 
+
+      onStartRequest: function saveLinkAs_onStartRequest(aRequest, aContext) {
+
+        // if the timer fired, the error status will have been caused by that,
+        // and we'll be restarting in onStopRequest, so no reason to notify
+        // the user
+        if (aRequest.status == NS_ERROR_SAVE_LINK_AS_TIMEOUT)
+          return;
+
+        timer.cancel();
+
+        // some other error occured; notify the user...
+        if (!Components.isSuccessCode(aRequest.status)) {
+          try {
+            const sbs = Cc["@mozilla.org/intl/stringbundle;1"].
+                        getService(Ci.nsIStringBundleService);
+            const bundle = sbs.createBundle(
+                    "chrome://mozapps/locale/downloads/downloads.properties");
+
+            const title = bundle.GetStringFromName("downloadErrorAlertTitle");
+            const msg = bundle.GetStringFromName("downloadErrorGeneric");
+
+            const promptSvc = Cc["@mozilla.org/embedcomp/prompt-service;1"].
+                              getService(Ci.nsIPromptService);
+            promptSvc.alert(doc.defaultView, title, msg);
+          } catch (ex) {}
+          return;
+        }
+
+        var extHelperAppSvc = 
+          Cc["@mozilla.org/uriloader/external-helper-app-service;1"].
+          getService(Ci.nsIExternalHelperAppService);
+        var channel = aRequest.QueryInterface(Ci.nsIChannel);
+        this.extListener = 
+          extHelperAppSvc.doContent(channel.contentType, aRequest, 
+                                    doc.defaultView, true);
+        this.extListener.onStartRequest(aRequest, aContext);
+      }, 
+
+      onStopRequest: function saveLinkAs_onStopRequest(aRequest, aContext, 
+                                                       aStatusCode) {
+        if (aStatusCode == NS_ERROR_SAVE_LINK_AS_TIMEOUT) {
+          // do it the old fashioned way, which will pick the best filename
+          // it can without waiting.
+          saveURL(linkURL, linkText, dialogTitle, bypassCache, false, doc.documentURIObject, doc);
+        }
+        if (this.extListener)
+          this.extListener.onStopRequest(aRequest, aContext, aStatusCode);
+      },
+
+      onDataAvailable: function saveLinkAs_onDataAvailable(aRequest, aContext,
+                                                           aInputStream,
+                                                           aOffset, aCount) {
+        this.extListener.onDataAvailable(aRequest, aContext, aInputStream,
+                                         aOffset, aCount);
+      }
+    }
+
+    function callbacks() {}
+    callbacks.prototype = {
+      getInterface: function sLA_callbacks_getInterface(aIID) {
+        if (aIID.equals(Ci.nsIAuthPrompt) || aIID.equals(Ci.nsIAuthPrompt2)) {
+          // If the channel demands authentication prompt, we must cancel it
+          // because the save-as-timer would expire and cancel the channel
+          // before we get credentials from user.  Both authentication dialog
+          // and save as dialog would appear on the screen as we fall back to
+          // the old fashioned way after the timeout.
+          timer.cancel();
+          channel.cancel(NS_ERROR_SAVE_LINK_AS_TIMEOUT);
+        }
+        throw Cr.NS_ERROR_NO_INTERFACE;
+      } 
+    }
+
+    // if it we don't have the headers after a short time, the user 
+    // won't have received any feedback from their click.  that's bad.  so
+    // we give up waiting for the filename. 
+    function timerCallback() {}
+    timerCallback.prototype = {
+      notify: function sLA_timer_notify(aTimer) {
+        channel.cancel(NS_ERROR_SAVE_LINK_AS_TIMEOUT);
+        return;
+      }
+    }
+
+    // setting up a new channel for 'right click - save link as ...'
+    var channel = NetUtil.newChannel({
+                    uri: makeURI(linkURL),
+                    loadingPrincipal: this.target.ownerDocument.nodePrincipal,
+                    contentPolicyType: Ci.nsIContentPolicy.TYPE_SAVEAS_DOWNLOAD,
+                    securityFlags: Ci.nsILoadInfo.SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS,
+                  });
+
+    if (linkDownload)
+      channel.contentDispositionFilename = linkDownload;
+    if (channel instanceof Ci.nsIPrivateBrowsingChannel) {
+      let docIsPrivate = PrivateBrowsingUtils.isWindowPrivate(doc.defaultView);
+      channel.setPrivate(docIsPrivate);
+    }
+    channel.notificationCallbacks = new callbacks();
+
+    let flags = Ci.nsIChannel.LOAD_CALL_CONTENT_SNIFFERS;
+
+    if (bypassCache)
+      flags |= Ci.nsIRequest.LOAD_BYPASS_CACHE;
+
+    if (channel instanceof Ci.nsICachingChannel)
+      flags |= Ci.nsICachingChannel.LOAD_BYPASS_LOCAL_CACHE_IF_BUSY;
+
+    channel.loadFlags |= flags;
+
+    if (channel instanceof Ci.nsIHttpChannel) {
+      channel.referrer = doc.documentURIObject;
+      if (channel instanceof Ci.nsIHttpChannelInternal)
+        channel.forceAllowThirdPartyCookie = true;
+    }
+
+    // fallback to the old way if we don't see the headers quickly 
+    var timeToWait = 
+      gPrefService.getIntPref("browser.download.saveLinkAsFilenameTimeout");
+    var timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
+    timer.initWithCallback(new timerCallback(), timeToWait,
+                           timer.TYPE_ONE_SHOT);
+
+    // kick off the channel with our proxy object as the listener
+    channel.asyncOpen2(new saveAsListener());
+  },
+
+  // Save URL of clicked-on link.
+  saveLink: function() {
+    var doc =  this.target.ownerDocument;
+    var linkText;
+    // If selected text is found to match valid URL pattern.
+    if (this.onPlainTextLink)
+      linkText = document.commandDispatcher.focusedWindow.getSelection().toString().trim();
+    else
+      linkText = this.linkText();
+    urlSecurityCheck(this.linkURL, doc.nodePrincipal);
+
+    this.saveHelper(this.linkURL, linkText, null, true, doc,
+                    this.linkDownload);
+  },
+
+  sendLink: function() {
+    // we don't know the title of the link so pass in an empty string
+    MailIntegration.sendMessage( this.linkURL, "" );
+  },
+
+  // Backwards-compatibility wrapper
+  saveImage : function() {
+    if (this.onCanvas || this.onImage)
+        this.saveMedia();
+  },
+
+  // Save URL of the clicked upon image, video, or audio.
+  saveMedia: function() {
+    var doc = this.target.ownerDocument;
+    let referrerURI = doc.documentURIObject;
+    let isPrivate = PrivateBrowsingUtils.isBrowserPrivate(this.browser);
+    if (this.onCanvas) {
+      // Bypass cache, since it's a blob: URL.
+      var target = this.target;
+      var win = doc.defaultView;
+      if (!win) {
+        Components.utils.reportError(
+            "Save Image As (on the <canvas> element):\n" +
+            "This feature cannot be used, because it hasn't found " + 
+            "an appropriate window.");
+      } else {
+        new Promise.resolve({then: function (resolve) {
+          target.toBlob((blob) => {
+          resolve(win.URL.createObjectURL(blob));
+        })
+        }}).then(function (blobURL) {
+          saveImageURL(blobURL, "canvas.png", "SaveImageTitle",
+                       true, false, referrerURI, null, null, null,
+                       isPrivate);
+        }, Components.utils.reportError);
+      }
+    } else if (this.onImage) {
+      urlSecurityCheck(this.mediaURL, doc.nodePrincipal);
+      saveImageURL(this.mediaURL, null, "SaveImageTitle",
+                   false, false, referrerURI, doc, null, null,
+                   isPrivate);
+    } else if (this.onVideo || this.onAudio) {
+      urlSecurityCheck(this.mediaURL, doc.nodePrincipal);
+      var dialogTitle = this.onVideo ? "SaveVideoTitle" : "SaveAudioTitle";
+      this.saveHelper(this.mediaURL, null, dialogTitle, false, doc, "");
+    }
+  },
+
+  // Backwards-compatibility wrapper
+  sendImage : function() {
+    if (this.onCanvas || this.onImage)
+        this.sendMedia();
+  },
+
+  sendMedia: function() {
+    MailIntegration.sendMessage(this.mediaURL, "");
+  },
+
+  playPlugin: function() {
+    gPluginHandler._showClickToPlayNotification(this.browser, this.target);
+  },
+
+  hidePlugin: function() {
+    gPluginHandler.hideClickToPlayOverlay(this.target);
+  },
+
+  // Generate email address and put it on clipboard.
+  copyEmail: function() {
+    // Copy the comma-separated list of email addresses only.
+    // There are other ways of embedding email addresses in a mailto:
+    // link, but such complex parsing is beyond us.
+    var url = this.linkURL;
+    var qmark = url.indexOf("?");
+    var addresses;
+
+    // 7 == length of "mailto:"
+    addresses = qmark > 7 ? url.substring(7, qmark) : url.substr(7);
+
+    // Let's try to unescape it using a character set
+    // in case the address is not ASCII.
+    try {
+      var characterSet = this.target.ownerDocument.characterSet;
+      const textToSubURI = Cc["@mozilla.org/intl/texttosuburi;1"].
+                           getService(Ci.nsITextToSubURI);
+      addresses = textToSubURI.unEscapeURIForUI(characterSet, addresses);
+    }
+    catch(ex) {
+      // Do nothing.
+    }
+
+    var clipboard = Cc["@mozilla.org/widget/clipboardhelper;1"].
+                    getService(Ci.nsIClipboardHelper);
+    clipboard.copyString(addresses, document);
+  },
+
+  ///////////////
+  // Utilities //
+  ///////////////
+
+  // Show/hide one item (specified via name or the item element itself).
+  showItem: function(aItemOrId, aShow) {
+    var item = aItemOrId.constructor == String ?
+      document.getElementById(aItemOrId) : aItemOrId;
+    if (item)
+      item.hidden = !aShow;
+  },
+
+  // Set given attribute of specified context-menu item.  If the
+  // value is null, then it removes the attribute (which works
+  // nicely for the disabled attribute).
+  setItemAttr: function(aID, aAttr, aVal ) {
+    var elem = document.getElementById(aID);
+    if (elem) {
+      if (aVal == null) {
+        // null indicates attr should be removed.
+        elem.removeAttribute(aAttr);
+      }
+      else {
+        // Set attr=val.
+        elem.setAttribute(aAttr, aVal);
+      }
+    }
+  },
+
+  // Set context menu attribute according to like attribute of another node
+  // (such as a broadcaster).
+  setItemAttrFromNode: function(aItem_id, aAttr, aOther_id) {
+    var elem = document.getElementById(aOther_id);
+    if (elem && elem.getAttribute(aAttr) == "true")
+      this.setItemAttr(aItem_id, aAttr, "true");
+    else
+      this.setItemAttr(aItem_id, aAttr, null);
+  },
+
+  // Temporary workaround for DOM api not yet implemented by XUL nodes.
+  cloneNode: function(aItem) {
+    // Create another element like the one we're cloning.
+    var node = document.createElement(aItem.tagName);
+
+    // Copy attributes from argument item to the new one.
+    var attrs = aItem.attributes;
+    for (var i = 0; i < attrs.length; i++) {
+      var attr = attrs.item(i);
+      node.setAttribute(attr.nodeName, attr.nodeValue);
+    }
+
+    // Voila!
+    return node;
+  },
+
+  // Generate fully qualified URL for clicked-on link.
+  getLinkURL: function() {
+    var href = this.link.href;  
+    if (href)
+      return href;
+
+    href = this.link.getAttributeNS("http://www.w3.org/1999/xlink",
+                                    "href");
+
+    if (!href || !href.match(/\S/)) {
+      // Without this we try to save as the current doc,
+      // for example, HTML case also throws if empty
+      throw "Empty href";
+    }
+
+    return makeURLAbsolute(this.link.baseURI, href);
+  },
+
+  getLinkURI: function() {
+    try {
+      return makeURI(this.linkURL);
+    }
+    catch (ex) {
+     // e.g. empty URL string
+    }
+
+    return null;
+  },
+
+  getLinkProtocol: function() {
+    if (this.linkURI)
+      return this.linkURI.scheme; // can be |undefined|
+
+    return null;
+  },
+
+  // Get text of link.
+  linkText: function() {
+    var text = gatherTextUnder(this.link);
+    if (!text || !text.match(/\S/)) {
+      text = this.link.getAttribute("title");
+      if (!text || !text.match(/\S/)) {
+        text = this.link.getAttribute("alt");
+        if (!text || !text.match(/\S/))
+          text = this.linkURL;
+      }
+    }
+
+    return text;
+  },
+
+  // Returns true if anything is selected.
+  isContentSelection: function() {
+    return !document.commandDispatcher.focusedWindow.getSelection().isCollapsed;
+  },
+
+  toString: function () {
+    return "contextMenu.target     = " + this.target + "\n" +
+           "contextMenu.onImage    = " + this.onImage + "\n" +
+           "contextMenu.onLink     = " + this.onLink + "\n" +
+           "contextMenu.link       = " + this.link + "\n" +
+           "contextMenu.inFrame    = " + this.inFrame + "\n" +
+           "contextMenu.hasBGImage = " + this.hasBGImage + "\n";
+  },
+
+  isDisabledForEvents: function(aNode) {
+    let ownerDoc = aNode.ownerDocument;
+    return ownerDoc.defaultView &&
+           ownerDoc.defaultView
+              .QueryInterface(Components.interfaces.nsIInterfaceRequestor)
+              .getInterface(Components.interfaces.nsIDOMWindowUtils)
+              .isNodeDisabledForEvents(aNode);
+  },
+
+  isTargetATextBox: function(node) {
+    if (node instanceof HTMLInputElement)
+      return node.mozIsTextField(false);
+
+    return (node instanceof HTMLTextAreaElement);
+  },
+
+  isTargetAKeywordField: function(aNode) {
+    if (!(aNode instanceof HTMLInputElement))
+      return false;
+
+    var form = aNode.form;
+    if (!form || aNode.type == "password")
+      return false;
+
+    var method = form.method.toUpperCase();
+
+    // These are the following types of forms we can create keywords for:
+    //
+    // method   encoding type       can create keyword
+    // GET      *                                 YES
+    //          *                                 YES
+    // POST                                       YES
+    // POST     application/x-www-form-urlencoded YES
+    // POST     text/plain                        NO (a little tricky to do)
+    // POST     multipart/form-data               NO
+    // POST     everything else                   YES
+    return (method == "GET" || method == "") ||
+           (form.enctype != "text/plain") && (form.enctype != "multipart/form-data");
+  },
+
+  // Determines whether or not the separator with the specified ID should be
+  // shown or not by determining if there are any non-hidden items between it
+  // and the previous separator.
+  shouldShowSeparator: function (aSeparatorID) {
+    var separator = document.getElementById(aSeparatorID);
+    if (separator) {
+      var sibling = separator.previousSibling;
+      while (sibling && sibling.localName != "menuseparator") {
+        if (!sibling.hidden)
+          return true;
+        sibling = sibling.previousSibling;
+      }
+    }
+    return false;
+  },
+
+  addDictionaries: function() {
+    var uri = formatURL("browser.dictionaries.download.url", true);
+
+    var locale = "-";
+    try {
+      locale = gPrefService.getComplexValue("intl.accept_languages",
+                                            Ci.nsIPrefLocalizedString).data;
+    }
+    catch (e) { }
+
+    var version = "-";
+    try {
+      version = Cc["@mozilla.org/xre/app-info;1"].
+                getService(Ci.nsIXULAppInfo).version;
+    }
+    catch (e) { }
+
+    uri = uri.replace(/%LOCALE%/, escape(locale)).replace(/%VERSION%/, version);
+
+    var newWindowPref = gPrefService.getIntPref("browser.link.open_newwindow");
+    var where = newWindowPref == 3 ? "tab" : "window";
+
+    openUILinkIn(uri, where);
+  },
+
+  bookmarkThisPage: function CM_bookmarkThisPage() {
+    window.top.PlacesCommandHook.bookmarkPage(this.browser, PlacesUtils.bookmarksMenuFolderId, true);
+  },
+
+  bookmarkLink: function CM_bookmarkLink() {
+    var linkText;
+    // If selected text is found to match valid URL pattern.
+    if (this.onPlainTextLink)
+      linkText = document.commandDispatcher.focusedWindow.getSelection().toString().trim();
+    else
+      linkText = this.linkText();
+    window.top.PlacesCommandHook.bookmarkLink(PlacesUtils.bookmarksMenuFolderId, this.linkURL,
+                                              linkText);
+  },
+
+  addBookmarkForFrame: function CM_addBookmarkForFrame() {
+    var doc = this.target.ownerDocument;
+    var uri = doc.documentURIObject;
+
+    var itemId = PlacesUtils.getMostRecentBookmarkForURI(uri);
+    if (itemId == -1) {
+      var title = doc.title;
+      var description = PlacesUIUtils.getDescriptionFromDocument(doc);
+      PlacesUIUtils.showBookmarkDialog({ action: "add"
+                                       , type: "bookmark"
+                                       , uri: uri
+                                       , title: title
+                                       , description: description
+                                       , hiddenRows: [ "description"
+                                                     , "location"
+                                                     , "loadInSidebar"
+                                                     , "keyword" ]
+                                       }, window.top);
+    }
+    else {
+      PlacesUIUtils.showBookmarkDialog({ action: "edit"
+                                       , type: "bookmark"
+                                       , itemId: itemId
+                                       }, window.top);
+    }
+  },
+
+  savePageAs: function CM_savePageAs() {
+    saveDocument(this.browser.contentDocument);
+  },
+
+  sendPage: function CM_sendPage() {
+    MailIntegration.sendLinkForWindow(this.browser.contentWindow);  
+  },
+
+  printFrame: function CM_printFrame() {
+    PrintUtils.print(this.target.ownerDocument.defaultView);
+  },
+
+  switchPageDirection: function CM_switchPageDirection() {
+    SwitchDocumentDirection(this.browser.contentWindow);
+  },
+
+  mediaCommand : function CM_mediaCommand(command, data) {
+    var media = this.target;
+
+    switch (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 = data;
+        break;
+      case "hidecontrols":
+        media.removeAttribute("controls");
+        break;
+      case "showcontrols":
+        media.setAttribute("controls", "true");
+        break;
+      case "hidestats":
+      case "showstats":
+        var event = media.ownerDocument.createEvent("CustomEvent");
+        event.initCustomEvent("media-showStatistics", false, true, command == "showstats");
+        media.dispatchEvent(event);
+        break;
+    }
+  },
+
+  copyMediaLocation : function () {
+    var clipboard = Cc["@mozilla.org/widget/clipboardhelper;1"].
+                    getService(Ci.nsIClipboardHelper);
+    clipboard.copyString(this.mediaURL, document);
+  },
+
+  get imageURL() {
+    if (this.onImage)
+      return this.mediaURL;
+    return "";
+  },
+
+  // Formats the 'Search <engine> for "<selection or link text>"' context menu.
+  formatSearchContextItem: function() {
+    var menuItem = document.getElementById("context-searchselect");
+    var selectedText = this.isTextSelected ? this.textSelected : this.linkText();
+
+    // Store searchTerms in context menu item so we know what to search onclick
+    menuItem.searchTerms = selectedText;
+
+    if (selectedText.length > 15)
+      selectedText = selectedText.substr(0,15) + this.ellipsis;
+
+    // Use the current engine if the search bar is visible, the default
+    // engine otherwise.
+    var engineName = "";
+    var ss = Cc["@mozilla.org/browser/search-service;1"].
+             getService(Ci.nsIBrowserSearchService);
+    if (isElementVisible(BrowserSearch.searchBar))
+      engineName = ss.currentEngine.name;
+    else
+      engineName = ss.defaultEngine.name;
+
+    // format "Search <engine> for <selection>" string to show in menu
+    var menuLabel = gNavigatorBundle.getFormattedString("contextMenuSearch",
+                                                        [engineName,
+                                                         selectedText]);
+    menuItem.label = menuLabel;
+    menuItem.accessKey = gNavigatorBundle.getString("contextMenuSearch.accesskey");
+  }
+};