Revert "Add Basilisk"

This reverts commit e72ef92b5bdc43cd2584198e2e54e951b70299e8.

1 files changed, 0 insertions, 1737 deletions

diff --git a/application/basilisk/components/downloads/content/downloads.js b/application/basilisk/components/downloads/content/downloads.js
deleted file mode 100644
index ed2f0ca57..000000000
--- a/application/basilisk/components/downloads/content/downloads.js
+++ /dev/null
@@ -1,1737 +0,0 @@
-/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
-/* vim: set ts=2 et sw=2 tw=80: */
-/* 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/. */
-
-/**
- * Handles the Downloads panel user interface for each browser window.
- *
- * This file includes the following constructors and global objects:
- *
- * DownloadsPanel
- * Main entry point for the downloads panel interface.
- *
- * DownloadsOverlayLoader
- * Allows loading the downloads panel and the status indicator interfaces on
- * demand, to improve startup performance.
- *
- * DownloadsView
- * Builds and updates the downloads list widget, responding to changes in the
- * download state and real-time data.  In addition, handles part of the user
- * interaction events raised by the downloads list widget.
- *
- * DownloadsViewItem
- * Builds and updates a single item in the downloads list widget, responding to
- * changes in the download state and real-time data, and handles the user
- * interaction events related to a single item in the downloads list widgets.
- *
- * DownloadsViewController
- * Handles part of the user interaction events raised by the downloads list
- * widget, in particular the "commands" that apply to multiple items, and
- * dispatches the commands that apply to individual items.
- */
-
-/**
- * A few words on focus and focusrings
- *
- * We do quite a few hacks in the Downloads Panel for focusrings. In fact, we
- * basically suppress most if not all XUL-level focusrings, and style/draw
- * them ourselves (using :focus instead of -moz-focusring). There are a few
- * reasons for this:
- *
- * 1) Richlists on OSX don't have focusrings; instead, they are shown as
- *    selected. This makes for some ambiguity when we have a focused/selected
- *    item in the list, and the mouse is hovering a completed download (which
- *    highlights).
- * 2) Windows doesn't show focusrings until after the first time that tab is
- *    pressed (and by then you're focusing the second item in the panel).
- * 3) Richlistbox sets -moz-focusring even when we select it with a mouse.
- *
- * In general, the desired behaviour is to focus the first item after pressing
- * tab/down, and show that focus with a ring. Then, if the mouse moves over
- * the panel, to hide that focus ring; essentially resetting us to the state
- * before pressing the key.
- *
- * We end up capturing the tab/down key events, and preventing their default
- * behaviour. We then set a "keyfocus" attribute on the panel, which allows
- * us to draw a ring around the currently focused element. If the panel is
- * closed or the mouse moves over the panel, we remove the attribute.
- */
-
-"use strict";
-
-var { classes: Cc, interfaces: Ci, utils: Cu, results: Cr } = Components;
-
-Cu.import("resource://gre/modules/XPCOMUtils.jsm");
-
-XPCOMUtils.defineLazyModuleGetter(this, "DownloadsCommon",
-                                  "resource:///modules/DownloadsCommon.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "DownloadsViewUI",
-                                  "resource:///modules/DownloadsViewUI.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "FileUtils",
-                                  "resource://gre/modules/FileUtils.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "NetUtil",
-                                  "resource://gre/modules/NetUtil.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils",
-                                  "resource://gre/modules/PlacesUtils.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "Services",
-                                  "resource://gre/modules/Services.jsm");
-
-////////////////////////////////////////////////////////////////////////////////
-//// DownloadsPanel
-
-/**
- * Main entry point for the downloads panel interface.
- */
-const DownloadsPanel = {
-  //////////////////////////////////////////////////////////////////////////////
-  //// Initialization and termination
-
-  /**
-   * Internal state of the downloads panel, based on one of the kState
-   * constants.  This is not the same state as the XUL panel element.
-   */
-  _state: 0,
-
-  /** The panel is not linked to downloads data yet. */
-  get kStateUninitialized() {
-    return 0;
-  },
-  /** This object is linked to data, but the panel is invisible. */
-  get kStateHidden() {
-    return 1;
-  },
-  /** The panel will be shown as soon as possible. */
-  get kStateWaitingData() {
-    return 2;
-  },
-  /** The panel is almost shown - we're just waiting to get a handle on the
-      anchor. */
-  get kStateWaitingAnchor() {
-    return 3;
-  },
-  /** The panel is open. */
-  get kStateShown() {
-    return 4;
-  },
-
-  /**
-   * Location of the panel overlay.
-   */
-  get kDownloadsOverlay() {
-    return "chrome://browser/content/downloads/downloadsOverlay.xul";
-  },
-
-  /**
-   * Starts loading the download data in background, without opening the panel.
-   * Use showPanel instead to load the data and open the panel at the same time.
-   *
-   * @param aCallback
-   *        Called when initialization is complete.
-   */
-  initialize(aCallback) {
-    DownloadsCommon.log("Attempting to initialize DownloadsPanel for a window.");
-    if (this._state != this.kStateUninitialized) {
-      DownloadsCommon.log("DownloadsPanel is already initialized.");
-      DownloadsOverlayLoader.ensureOverlayLoaded(this.kDownloadsOverlay,
-                                                 aCallback);
-      return;
-    }
-    this._state = this.kStateHidden;
-
-    window.addEventListener("unload", this.onWindowUnload);
-
-    // Load and resume active downloads if required.  If there are downloads to
-    // be shown in the panel, they will be loaded asynchronously.
-    DownloadsCommon.initializeAllDataLinks();
-
-    // Now that data loading has eventually started, load the required XUL
-    // elements and initialize our views.
-    DownloadsCommon.log("Ensuring DownloadsPanel overlay loaded.");
-    DownloadsOverlayLoader.ensureOverlayLoaded(this.kDownloadsOverlay, () => {
-      DownloadsViewController.initialize();
-      DownloadsCommon.log("Attaching DownloadsView...");
-      DownloadsCommon.getData(window).addView(DownloadsView);
-      DownloadsCommon.getSummary(window, DownloadsView.kItemCountLimit)
-                     .addView(DownloadsSummary);
-      DownloadsCommon.log("DownloadsView attached - the panel for this window",
-                          "should now see download items come in.");
-      DownloadsPanel._attachEventListeners();
-      DownloadsCommon.log("DownloadsPanel initialized.");
-      aCallback();
-    });
-  },
-
-  /**
-   * Closes the downloads panel and frees the internal resources related to the
-   * downloads.  The downloads panel can be reopened later, even after this
-   * function has been called.
-   */
-  terminate() {
-    DownloadsCommon.log("Attempting to terminate DownloadsPanel for a window.");
-    if (this._state == this.kStateUninitialized) {
-      DownloadsCommon.log("DownloadsPanel was never initialized. Nothing to do.");
-      return;
-    }
-
-    window.removeEventListener("unload", this.onWindowUnload);
-
-    // Ensure that the panel is closed before shutting down.
-    this.hidePanel();
-
-    DownloadsViewController.terminate();
-    DownloadsCommon.getData(window).removeView(DownloadsView);
-    DownloadsCommon.getSummary(window, DownloadsView.kItemCountLimit)
-                   .removeView(DownloadsSummary);
-    this._unattachEventListeners();
-
-    this._state = this.kStateUninitialized;
-
-    DownloadsSummary.active = false;
-    DownloadsCommon.log("DownloadsPanel terminated.");
-  },
-
-  //////////////////////////////////////////////////////////////////////////////
-  //// Panel interface
-
-  /**
-   * Main panel element in the browser window, or null if the panel overlay
-   * hasn't been loaded yet.
-   */
-  get panel() {
-    // If the downloads panel overlay hasn't loaded yet, just return null
-    // without resetting this.panel.
-    let downloadsPanel = document.getElementById("downloadsPanel");
-    if (!downloadsPanel)
-      return null;
-
-    delete this.panel;
-    return this.panel = downloadsPanel;
-  },
-
-  /**
-   * Starts opening the downloads panel interface, anchored to the downloads
-   * button of the browser window.  The list of downloads to display is
-   * initialized the first time this method is called, and the panel is shown
-   * only when data is ready.
-   */
-  showPanel() {
-    DownloadsCommon.log("Opening the downloads panel.");
-
-    if (this.isPanelShowing) {
-      DownloadsCommon.log("Panel is already showing - focusing instead.");
-      this._focusPanel();
-      return;
-    }
-
-    this.initialize(() => {
-      let downloadsFooterButtons =
-        document.getElementById("downloadsFooterButtons");
-      if (DownloadsCommon.showPanelDropmarker) {
-        downloadsFooterButtons.classList.remove("downloadsHideDropmarker");
-      } else {
-        downloadsFooterButtons.classList.add("downloadsHideDropmarker");
-      }
-
-      // Delay displaying the panel because this function will sometimes be
-      // called while another window is closing (like the window for selecting
-      // whether to save or open the file), and that would cause the panel to
-      // close immediately.
-      setTimeout(() => this._openPopupIfDataReady(), 0);
-    });
-
-    DownloadsCommon.log("Waiting for the downloads panel to appear.");
-    this._state = this.kStateWaitingData;
-  },
-
-  /**
-   * Hides the downloads panel, if visible, but keeps the internal state so that
-   * the panel can be reopened quickly if required.
-   */
-  hidePanel() {
-    DownloadsCommon.log("Closing the downloads panel.");
-
-    if (!this.isPanelShowing) {
-      DownloadsCommon.log("Downloads panel is not showing - nothing to do.");
-      return;
-    }
-
-    this.panel.hidePopup();
-
-    // Ensure that we allow the panel to be reopened.  Note that, if the popup
-    // was open, then the onPopupHidden event handler has already updated the
-    // current state, otherwise we must update the state ourselves.
-    this._state = this.kStateHidden;
-    DownloadsCommon.log("Downloads panel is now closed.");
-  },
-
-  /**
-   * Indicates whether the panel is shown or will be shown.
-   */
-  get isPanelShowing() {
-    return this._state == this.kStateWaitingData ||
-           this._state == this.kStateWaitingAnchor ||
-           this._state == this.kStateShown;
-  },
-
-  /**
-   * Returns whether the user has started keyboard navigation.
-   */
-  get keyFocusing() {
-    return this.panel.hasAttribute("keyfocus");
-  },
-
-  /**
-   * Set to true if the user has started keyboard navigation, and we should be
-   * showing focusrings in the panel. Also adds a mousemove event handler to
-   * the panel which disables keyFocusing.
-   */
-  set keyFocusing(aValue) {
-    if (aValue) {
-      this.panel.setAttribute("keyfocus", "true");
-      this.panel.addEventListener("mousemove", this);
-    } else {
-      this.panel.removeAttribute("keyfocus");
-      this.panel.removeEventListener("mousemove", this);
-    }
-    return aValue;
-  },
-
-  /**
-   * Handles the mousemove event for the panel, which disables focusring
-   * visualization.
-   */
-  handleEvent(aEvent) {
-    switch (aEvent.type) {
-      case "mousemove":
-        this.keyFocusing = false;
-        break;
-      case "keydown":
-        return this._onKeyDown(aEvent);
-      case "keypress":
-        return this._onKeyPress(aEvent);
-      case "popupshown":
-        if (this.setHeightToFitOnShow) {
-          this.setHeightToFitOnShow = false;
-          this.setHeightToFit();
-        }
-        break;
-    }
-  },
-
-  setHeightToFit() {
-    if (this._state == this.kStateShown) {
-      DownloadsBlockedSubview.view.setHeightToFit();
-    } else {
-      this.setHeightToFitOnShow = true;
-    }
-  },
-
-  //////////////////////////////////////////////////////////////////////////////
-  //// Callback functions from DownloadsView
-
-  /**
-   * Called after data loading finished.
-   */
-  onViewLoadCompleted() {
-    this._openPopupIfDataReady();
-  },
-
-  //////////////////////////////////////////////////////////////////////////////
-  //// User interface event functions
-
-  onWindowUnload() {
-    // This function is registered as an event listener, we can't use "this".
-    DownloadsPanel.terminate();
-  },
-
-  onPopupShown(aEvent) {
-    // Ignore events raised by nested popups.
-    if (aEvent.target != aEvent.currentTarget) {
-      return;
-    }
-
-    DownloadsCommon.log("Downloads panel has shown.");
-    this._state = this.kStateShown;
-
-    // Since at most one popup is open at any given time, we can set globally.
-    DownloadsCommon.getIndicatorData(window).attentionSuppressed = true;
-
-    // Ensure that the first item is selected when the panel is focused.
-    if (DownloadsView.richListBox.itemCount > 0 &&
-        DownloadsView.richListBox.selectedIndex == -1) {
-      DownloadsView.richListBox.selectedIndex = 0;
-    }
-
-    this._focusPanel();
-  },
-
-  onPopupHidden(aEvent) {
-    // Ignore events raised by nested popups.
-    if (aEvent.target != aEvent.currentTarget) {
-      return;
-    }
-
-    DownloadsCommon.log("Downloads panel has hidden.");
-
-    // Removes the keyfocus attribute so that we stop handling keyboard
-    // navigation.
-    this.keyFocusing = false;
-
-    // Since at most one popup is open at any given time, we can set globally.
-    DownloadsCommon.getIndicatorData(window).attentionSuppressed = false;
-
-    // Allow the anchor to be hidden.
-    DownloadsButton.releaseAnchor();
-
-    // Allow the panel to be reopened.
-    this._state = this.kStateHidden;
-  },
-
-  onFooterPopupShowing(aEvent) {
-    let itemClearList = document.getElementById("downloadsDropdownItemClearList");
-    if (DownloadsCommon.getData(window).canRemoveFinished) {
-      itemClearList.removeAttribute("hidden");
-    } else {
-      itemClearList.setAttribute("hidden", "true");
-    }
-    DownloadsViewController.updateCommands();
-
-    document.getElementById("downloadsFooter")
-      .setAttribute("showingdropdown", true);
-  },
-
-  onFooterPopupHidden(aEvent) {
-    document.getElementById("downloadsFooter")
-      .removeAttribute("showingdropdown");
-  },
-
-  //////////////////////////////////////////////////////////////////////////////
-  //// Related operations
-
-  /**
-   * Shows or focuses the user interface dedicated to downloads history.
-   */
-  showDownloadsHistory() {
-    DownloadsCommon.log("Showing download history.");
-    // Hide the panel before showing another window, otherwise focus will return
-    // to the browser window when the panel closes automatically.
-    this.hidePanel();
-
-    BrowserDownloadsUI();
-  },
-
-  openDownloadsFolder() {
-    Downloads.getPreferredDownloadsDirectory().then(downloadsPath => {
-      DownloadsCommon.showDirectory(new FileUtils.File(downloadsPath));
-    }).catch(Cu.reportError);
-    this.hidePanel();
-  },
-
-  //////////////////////////////////////////////////////////////////////////////
-  //// Internal functions
-
-  /**
-   * Attach event listeners to a panel element. These listeners should be
-   * removed in _unattachEventListeners. This is called automatically after the
-   * panel has successfully loaded.
-   */
-  _attachEventListeners() {
-    // Handle keydown to support accel-V.
-    this.panel.addEventListener("keydown", this);
-    // Handle keypress to be able to preventDefault() events before they reach
-    // the richlistbox, for keyboard navigation.
-    this.panel.addEventListener("keypress", this);
-    // Handle height adjustment on show.
-    this.panel.addEventListener("popupshown", this);
-  },
-
-  /**
-   * Unattach event listeners that were added in _attachEventListeners. This
-   * is called automatically on panel termination.
-   */
-  _unattachEventListeners() {
-    this.panel.removeEventListener("keydown", this);
-    this.panel.removeEventListener("keypress", this);
-    this.panel.removeEventListener("popupshown", this);
-  },
-
-  _onKeyPress(aEvent) {
-    // Handle unmodified keys only.
-    if (aEvent.altKey || aEvent.ctrlKey || aEvent.shiftKey || aEvent.metaKey) {
-      return;
-    }
-
-    let richListBox = DownloadsView.richListBox;
-
-    // If the user has pressed the tab, up, or down cursor key, start keyboard
-    // navigation, thus enabling focusrings in the panel.  Keyboard navigation
-    // is automatically disabled if the user moves the mouse on the panel, or
-    // if the panel is closed.
-    if ((aEvent.keyCode == Ci.nsIDOMKeyEvent.DOM_VK_TAB ||
-        aEvent.keyCode == Ci.nsIDOMKeyEvent.DOM_VK_UP ||
-        aEvent.keyCode == Ci.nsIDOMKeyEvent.DOM_VK_DOWN) &&
-        !this.keyFocusing) {
-      this.keyFocusing = true;
-      // Ensure there's a selection, we will show the focus ring around it and
-      // prevent the richlistbox from changing the selection.
-      if (DownloadsView.richListBox.selectedIndex == -1) {
-        DownloadsView.richListBox.selectedIndex = 0;
-      }
-      aEvent.preventDefault();
-      return;
-    }
-
-    if (aEvent.keyCode == Ci.nsIDOMKeyEvent.DOM_VK_DOWN) {
-      // If the last element in the list is selected, or the footer is already
-      // focused, focus the footer.
-      if (richListBox.selectedItem === richListBox.lastChild ||
-          document.activeElement.parentNode.id === "downloadsFooter") {
-        DownloadsFooter.focus();
-        aEvent.preventDefault();
-        return;
-      }
-    }
-
-    // Pass keypress events to the richlistbox view when it's focused.
-    if (document.activeElement === richListBox) {
-      DownloadsView.onDownloadKeyPress(aEvent);
-    }
-  },
-
-  /**
-   * Keydown listener that listens for the keys to start key focusing, as well
-   * as the the accel-V "paste" event, which initiates a file download if the
-   * pasted item can be resolved to a URI.
-   */
-  _onKeyDown(aEvent) {
-    // If the footer is focused and the downloads list has at least 1 element
-    // in it, focus the last element in the list when going up.
-    if (aEvent.keyCode == Ci.nsIDOMKeyEvent.DOM_VK_UP &&
-        document.activeElement.parentNode.id === "downloadsFooter" &&
-        DownloadsView.richListBox.firstChild) {
-      DownloadsView.richListBox.focus();
-      DownloadsView.richListBox.selectedItem = DownloadsView.richListBox.lastChild;
-      aEvent.preventDefault();
-      return;
-    }
-
-    let pasting = aEvent.keyCode == Ci.nsIDOMKeyEvent.DOM_VK_V &&
-                  aEvent.getModifierState("Accel");
-
-    if (!pasting) {
-      return;
-    }
-
-    DownloadsCommon.log("Received a paste event.");
-
-    let trans = Cc["@mozilla.org/widget/transferable;1"]
-                  .createInstance(Ci.nsITransferable);
-    trans.init(null);
-    let flavors = ["text/x-moz-url", "text/unicode"];
-    flavors.forEach(trans.addDataFlavor);
-    Services.clipboard.getData(trans, Services.clipboard.kGlobalClipboard);
-    // Getting the data or creating the nsIURI might fail
-    try {
-      let data = {};
-      trans.getAnyTransferData({}, data, {});
-      let [url, name] = data.value
-                            .QueryInterface(Ci.nsISupportsString)
-                            .data
-                            .split("\n");
-      if (!url) {
-        return;
-      }
-
-      let uri = NetUtil.newURI(url);
-      DownloadsCommon.log("Pasted URL seems valid. Starting download.");
-      DownloadURL(uri.spec, name, document);
-    } catch (ex) {}
-  },
-
-  /**
-   * Move focus to the main element in the downloads panel, unless another
-   * element in the panel is already focused.
-   */
-  _focusPanel() {
-    // We may be invoked while the panel is still waiting to be shown.
-    if (this._state != this.kStateShown) {
-      return;
-    }
-
-    let element = document.commandDispatcher.focusedElement;
-    while (element && element != this.panel) {
-      element = element.parentNode;
-    }
-    if (!element) {
-      if (DownloadsView.richListBox.itemCount > 0) {
-        DownloadsView.richListBox.focus();
-      } else {
-        DownloadsFooter.focus();
-      }
-    }
-  },
-
-  /**
-   * Opens the downloads panel when data is ready to be displayed.
-   */
-  _openPopupIfDataReady() {
-    // We don't want to open the popup if we already displayed it, or if we are
-    // still loading data.
-    if (this._state != this.kStateWaitingData || DownloadsView.loading) {
-      return;
-    }
-
-    this._state = this.kStateWaitingAnchor;
-
-    // Ensure the anchor is visible.  If that is not possible, show the panel
-    // anchored to the top area of the window, near the default anchor position.
-    DownloadsButton.getAnchor(anchor => {
-      // If somehow we've switched states already (by getting a panel hiding
-      // event before an overlay is loaded, for example), bail out.
-      if (this._state != this.kStateWaitingAnchor) {
-        return;
-      }
-
-      // At this point, if the window is minimized, opening the panel could fail
-      // without any notification, and there would be no way to either open or
-      // close the panel any more.  To prevent this, check if the window is
-      // minimized and in that case force the panel to the closed state.
-      if (window.windowState == Ci.nsIDOMChromeWindow.STATE_MINIMIZED) {
-        DownloadsButton.releaseAnchor();
-        this._state = this.kStateHidden;
-        return;
-      }
-
-      if (!anchor) {
-        DownloadsCommon.error("Downloads button cannot be found.");
-        return;
-      }
-
-      // When the panel is opened, we check if the target files of visible items
-      // still exist, and update the allowed items interactions accordingly.  We
-      // do these checks on a background thread, and don't prevent the panel to
-      // be displayed while these checks are being performed.
-      for (let viewItem of DownloadsView._visibleViewItems.values()) {
-        viewItem.download.refresh().catch(Cu.reportError);
-      }
-
-      DownloadsCommon.log("Opening downloads panel popup.");
-      this.panel.openPopup(anchor, "bottomcenter topright", 0, 0, false, null);
-    });
-  },
-};
-
-XPCOMUtils.defineConstant(this, "DownloadsPanel", DownloadsPanel);
-
-////////////////////////////////////////////////////////////////////////////////
-//// DownloadsOverlayLoader
-
-/**
- * Allows loading the downloads panel and the status indicator interfaces on
- * demand, to improve startup performance.
- */
-const DownloadsOverlayLoader = {
-  /**
-   * We cannot load two overlays at the same time, thus we use a queue of
-   * pending load requests.
-   */
-  _loadRequests: [],
-
-  /**
-   * True while we are waiting for an overlay to be loaded.
-   */
-  _overlayLoading: false,
-
-  /**
-   * This object has a key for each overlay URI that is already loaded.
-   */
-  _loadedOverlays: {},
-
-  /**
-   * Loads the specified overlay and invokes the given callback when finished.
-   *
-   * @param aOverlay
-   *        String containing the URI of the overlay to load in the current
-   *        window.  If this overlay has already been loaded using this
-   *        function, then the overlay is not loaded again.
-   * @param aCallback
-   *        Invoked when loading is completed.  If the overlay is already
-   *        loaded, the function is called immediately.
-   */
-  ensureOverlayLoaded(aOverlay, aCallback) {
-    // The overlay is already loaded, invoke the callback immediately.
-    if (aOverlay in this._loadedOverlays) {
-      aCallback();
-      return;
-    }
-
-    // The callback will be invoked when loading is finished.
-    this._loadRequests.push({ overlay: aOverlay, callback: aCallback });
-    if (this._overlayLoading) {
-      return;
-    }
-
-    this._overlayLoading = true;
-    DownloadsCommon.log("Loading overlay ", aOverlay);
-    document.loadOverlay(aOverlay, () => {
-      this._overlayLoading = false;
-      this._loadedOverlays[aOverlay] = true;
-
-      this.processPendingRequests();
-    });
-  },
-
-  /**
-   * Re-processes all the currently pending requests, invoking the callbacks
-   * and/or loading more overlays as needed.  In most cases, there will be a
-   * single request for one overlay, that will be processed immediately.
-   */
-  processPendingRequests() {
-    // Re-process all the currently pending requests, yet allow more requests
-    // to be appended at the end of the array if we're not ready for them.
-    let currentLength = this._loadRequests.length;
-    for (let i = 0; i < currentLength; i++) {
-      let request = this._loadRequests.shift();
-
-      // We must call ensureOverlayLoaded again for each request, to check if
-      // the associated callback can be invoked now, or if we must still wait
-      // for the associated overlay to load.
-      this.ensureOverlayLoaded(request.overlay, request.callback);
-    }
-  },
-};
-
-XPCOMUtils.defineConstant(this, "DownloadsOverlayLoader", DownloadsOverlayLoader);
-
-////////////////////////////////////////////////////////////////////////////////
-//// DownloadsView
-
-/**
- * Builds and updates the downloads list widget, responding to changes in the
- * download state and real-time data.  In addition, handles part of the user
- * interaction events raised by the downloads list widget.
- */
-const DownloadsView = {
-  //////////////////////////////////////////////////////////////////////////////
-  //// Functions handling download items in the list
-
-  /**
-   * Maximum number of items shown by the list at any given time.
-   */
-  kItemCountLimit: 5,
-
-  /**
-   * Indicates whether there is an open contextMenu for a download item.
-   */
-  contextMenuOpen: false,
-
-  /**
-   * Indicates whether there is a DownloadsBlockedSubview open.
-   */
-  subViewOpen: false,
-
-  /**
-   * Indicates whether we are still loading downloads data asynchronously.
-   */
-  loading: false,
-
-  /**
-   * Ordered array of all Download objects.  We need to keep this array because
-   * only a limited number of items are shown at once, and if an item that is
-   * currently visible is removed from the list, we might need to take another
-   * item from the array and make it appear at the bottom.
-   */
-  _downloads: [],
-
-  /**
-   * Associates the visible Download objects with their corresponding
-   * DownloadsViewItem object.  There is a limited number of view items in the
-   * panel at any given time.
-   */
-  _visibleViewItems: new Map(),
-
-  /**
-   * Called when the number of items in the list changes.
-   */
-  _itemCountChanged() {
-    DownloadsCommon.log("The downloads item count has changed - we are tracking",
-                        this._downloads.length, "downloads in total.");
-    let count = this._downloads.length;
-    let hiddenCount = count - this.kItemCountLimit;
-
-    if (count > 0) {
-      DownloadsCommon.log("Setting the panel's hasdownloads attribute to true.");
-      DownloadsPanel.panel.setAttribute("hasdownloads", "true");
-    } else {
-      DownloadsCommon.log("Removing the panel's hasdownloads attribute.");
-      DownloadsPanel.panel.removeAttribute("hasdownloads");
-    }
-
-    // If we've got some hidden downloads, we should activate the
-    // DownloadsSummary. The DownloadsSummary will determine whether or not
-    // it's appropriate to actually display the summary.
-    DownloadsSummary.active = hiddenCount > 0;
-  },
-
-  /**
-   * Element corresponding to the list of downloads.
-   */
-  get richListBox() {
-    delete this.richListBox;
-    return this.richListBox = document.getElementById("downloadsListBox");
-  },
-
-  /**
-   * Element corresponding to the button for showing more downloads.
-   */
-  get downloadsHistory() {
-    delete this.downloadsHistory;
-    return this.downloadsHistory = document.getElementById("downloadsHistory");
-  },
-
-  //////////////////////////////////////////////////////////////////////////////
-  //// Callback functions from DownloadsData
-
-  /**
-   * Called before multiple downloads are about to be loaded.
-   */
-  onDataLoadStarting() {
-    DownloadsCommon.log("onDataLoadStarting called for DownloadsView.");
-    this.loading = true;
-  },
-
-  /**
-   * Called after data loading finished.
-   */
-  onDataLoadCompleted() {
-    DownloadsCommon.log("onDataLoadCompleted called for DownloadsView.");
-
-    this.loading = false;
-
-    // We suppressed item count change notifications during the batch load, at
-    // this point we should just call the function once.
-    this._itemCountChanged();
-
-    // Notify the panel that all the initially available downloads have been
-    // loaded.  This ensures that the interface is visible, if still required.
-    DownloadsPanel.onViewLoadCompleted();
-  },
-
-  /**
-   * Called when a new download data item is available, either during the
-   * asynchronous data load or when a new download is started.
-   *
-   * @param aDownload
-   *        Download object that was just added.
-   * @param aNewest
-   *        When true, indicates that this item is the most recent and should be
-   *        added in the topmost position.  This happens when a new download is
-   *        started.  When false, indicates that the item is the least recent
-   *        and should be appended.  The latter generally happens during the
-   *        asynchronous data load.
-   */
-  onDownloadAdded(download, aNewest) {
-    DownloadsCommon.log("A new download data item was added - aNewest =",
-                        aNewest);
-
-    if (aNewest) {
-      this._downloads.unshift(download);
-    } else {
-      this._downloads.push(download);
-    }
-
-    let itemsNowOverflow = this._downloads.length > this.kItemCountLimit;
-    if (aNewest || !itemsNowOverflow) {
-      // The newly added item is visible in the panel and we must add the
-      // corresponding element.  This is either because it is the first item, or
-      // because it was added at the bottom but the list still doesn't overflow.
-      this._addViewItem(download, aNewest);
-    }
-    if (aNewest && itemsNowOverflow) {
-      // If the list overflows, remove the last item from the panel to make room
-      // for the new one that we just added at the top.
-      this._removeViewItem(this._downloads[this.kItemCountLimit]);
-    }
-
-    // For better performance during batch loads, don't update the count for
-    // every item, because the interface won't be visible until load finishes.
-    if (!this.loading) {
-      this._itemCountChanged();
-    }
-  },
-
-  onDownloadStateChanged(download) {
-    let viewItem = this._visibleViewItems.get(download);
-    if (viewItem) {
-      viewItem.onStateChanged();
-    }
-  },
-
-  onDownloadChanged(download) {
-    let viewItem = this._visibleViewItems.get(download);
-    if (viewItem) {
-      viewItem.onChanged();
-    }
-  },
-
-  /**
-   * Called when a data item is removed.  Ensures that the widget associated
-   * with the view item is removed from the user interface.
-   *
-   * @param download
-   *        Download object that is being removed.
-   */
-  onDownloadRemoved(download) {
-    DownloadsCommon.log("A download data item was removed.");
-
-    let itemIndex = this._downloads.indexOf(download);
-    this._downloads.splice(itemIndex, 1);
-
-    if (itemIndex < this.kItemCountLimit) {
-      // The item to remove is visible in the panel.
-      this._removeViewItem(download);
-      if (this._downloads.length >= this.kItemCountLimit) {
-        // Reinsert the next item into the panel.
-        this._addViewItem(this._downloads[this.kItemCountLimit - 1], false);
-      }
-    }
-
-    this._itemCountChanged();
-
-    // Adjust the panel height if we removed items.
-    DownloadsPanel.setHeightToFit();
-  },
-
-  /**
-   * Associates each richlistitem for a download with its corresponding
-   * DownloadsViewItem object.
-   */
-  _itemsForElements: new Map(),
-
-  itemForElement(element) {
-    return this._itemsForElements.get(element);
-  },
-
-  /**
-   * Creates a new view item associated with the specified data item, and adds
-   * it to the top or the bottom of the list.
-   */
-  _addViewItem(download, aNewest)
-  {
-    DownloadsCommon.log("Adding a new DownloadsViewItem to the downloads list.",
-                        "aNewest =", aNewest);
-
-    let element = document.createElement("richlistitem");
-    let viewItem = new DownloadsViewItem(download, element);
-    this._visibleViewItems.set(download, viewItem);
-    this._itemsForElements.set(element, viewItem);
-    if (aNewest) {
-      this.richListBox.insertBefore(element, this.richListBox.firstChild);
-    } else {
-      this.richListBox.appendChild(element);
-    }
-  },
-
-  /**
-   * Removes the view item associated with the specified data item.
-   */
-  _removeViewItem(download) {
-    DownloadsCommon.log("Removing a DownloadsViewItem from the downloads list.");
-    let element = this._visibleViewItems.get(download).element;
-    let previousSelectedIndex = this.richListBox.selectedIndex;
-    this.richListBox.removeChild(element);
-    if (previousSelectedIndex != -1) {
-      this.richListBox.selectedIndex = Math.min(previousSelectedIndex,
-                                                this.richListBox.itemCount - 1);
-    }
-    this._visibleViewItems.delete(download);
-    this._itemsForElements.delete(element);
-  },
-
-  //////////////////////////////////////////////////////////////////////////////
-  //// User interface event functions
-
-  /**
-   * Helper function to do commands on a specific download item.
-   *
-   * @param aEvent
-   *        Event object for the event being handled.  If the event target is
-   *        not a richlistitem that represents a download, this function will
-   *        walk up the parent nodes until it finds a DOM node that is.
-   * @param aCommand
-   *        The command to be performed.
-   */
-  onDownloadCommand(aEvent, aCommand) {
-    let target = aEvent.target;
-    while (target.nodeName != "richlistitem") {
-      target = target.parentNode;
-    }
-    DownloadsView.itemForElement(target).doCommand(aCommand);
-  },
-
-  onDownloadClick(aEvent) {
-    // Handle primary clicks only, and exclude the action button.
-    if (aEvent.button == 0 &&
-        !aEvent.originalTarget.hasAttribute("oncommand")) {
-      let target = aEvent.target;
-      while (target.nodeName != "richlistitem") {
-        target = target.parentNode;
-      }
-      let download = DownloadsView.itemForElement(target).download;
-      if (download.hasBlockedData) {
-        goDoCommand("downloadsCmd_showBlockedInfo");
-      } else {
-        goDoCommand("downloadsCmd_open");
-      }
-    }
-  },
-
-  /**
-   * Handles keypress events on a download item.
-   */
-  onDownloadKeyPress(aEvent) {
-    // Pressing the key on buttons should not invoke the action because the
-    // event has already been handled by the button itself.
-    if (aEvent.originalTarget.hasAttribute("command") ||
-        aEvent.originalTarget.hasAttribute("oncommand")) {
-      return;
-    }
-
-    if (aEvent.charCode == " ".charCodeAt(0)) {
-      goDoCommand("downloadsCmd_pauseResume");
-      return;
-    }
-
-    if (aEvent.keyCode == KeyEvent.DOM_VK_RETURN) {
-      goDoCommand("downloadsCmd_doDefault");
-    }
-  },
-
-  /**
-   * Event handlers to keep track of context menu state (open/closed) for
-   * download items.
-   */
-  onContextPopupShown(aEvent) {
-    // Ignore events raised by nested popups.
-    if (aEvent.target != aEvent.currentTarget) {
-      return;
-    }
-
-    DownloadsCommon.log("Context menu has shown.");
-    this.contextMenuOpen = true;
-  },
-
-  onContextPopupHidden(aEvent) {
-    // Ignore events raised by nested popups.
-    if (aEvent.target != aEvent.currentTarget) {
-      return;
-    }
-
-    DownloadsCommon.log("Context menu has hidden.");
-    this.contextMenuOpen = false;
-  },
-
-  /**
-   * Mouse listeners to handle selection on hover.
-   */
-  onDownloadMouseOver(aEvent) {
-    if (!(this.contextMenuOpen || this.subViewOpen) &&
-        aEvent.target.parentNode == this.richListBox) {
-      this.richListBox.selectedItem = aEvent.target;
-    }
-  },
-
-  onDownloadMouseOut(aEvent) {
-    if (!(this.contextMenuOpen || this.subViewOpen) &&
-        aEvent.target.parentNode == this.richListBox) {
-      // If the destination element is outside of the richlistitem, clear the
-      // selection.
-      let element = aEvent.relatedTarget;
-      while (element && element != aEvent.target) {
-        element = element.parentNode;
-      }
-      if (!element) {
-        this.richListBox.selectedIndex = -1;
-      }
-    }
-  },
-
-  onDownloadContextMenu(aEvent) {
-    let element = this.richListBox.selectedItem;
-    if (!element) {
-      return;
-    }
-
-    DownloadsViewController.updateCommands();
-
-    // Set the state attribute so that only the appropriate items are displayed.
-    let contextMenu = document.getElementById("downloadsContextMenu");
-    contextMenu.setAttribute("state", element.getAttribute("state"));
-    if (element.hasAttribute("exists")) {
-      contextMenu.setAttribute("exists", "true");
-    } else {
-      contextMenu.removeAttribute("exists");
-    }
-    contextMenu.classList.toggle("temporary-block",
-                                 element.classList.contains("temporary-block"));
-  },
-
-  onDownloadDragStart(aEvent) {
-    let element = this.richListBox.selectedItem;
-    if (!element) {
-      return;
-    }
-
-    // We must check for existence synchronously because this is a DOM event.
-    let file = new FileUtils.File(DownloadsView.itemForElement(element)
-                                               .download.target.path);
-    if (!file.exists()) {
-      return;
-    }
-
-    let dataTransfer = aEvent.dataTransfer;
-    dataTransfer.mozSetDataAt("application/x-moz-file", file, 0);
-    dataTransfer.effectAllowed = "copyMove";
-    let spec = NetUtil.newURI(file).spec;
-    dataTransfer.setData("text/uri-list", spec);
-    dataTransfer.setData("text/plain", spec);
-    dataTransfer.addElement(element);
-
-    aEvent.stopPropagation();
-  },
-}
-
-XPCOMUtils.defineConstant(this, "DownloadsView", DownloadsView);
-
-////////////////////////////////////////////////////////////////////////////////
-//// DownloadsViewItem
-
-/**
- * Builds and updates a single item in the downloads list widget, responding to
- * changes in the download state and real-time data, and handles the user
- * interaction events related to a single item in the downloads list widgets.
- *
- * @param download
- *        Download object to be associated with the view item.
- * @param aElement
- *        XUL element corresponding to the single download item in the view.
- */
-function DownloadsViewItem(download, aElement) {
-  this.download = download;
-  this.element = aElement;
-  this.element._shell = this;
-
-  this.element.setAttribute("type", "download");
-  this.element.classList.add("download-state");
-
-  this._updateState();
-}
-
-DownloadsViewItem.prototype = {
-  __proto__: DownloadsViewUI.DownloadElementShell.prototype,
-
-  /**
-   * The XUL element corresponding to the associated richlistbox item.
-   */
-  _element: null,
-
-  onStateChanged() {
-    this._updateState();
-  },
-
-  onChanged() {
-    this._updateProgress();
-  },
-
-  isCommandEnabled(aCommand) {
-    switch (aCommand) {
-      case "downloadsCmd_open": {
-        if (!this.download.succeeded) {
-          return false;
-        }
-
-        let file = new FileUtils.File(this.download.target.path);
-        return file.exists();
-      }
-      case "downloadsCmd_show": {
-        let file = new FileUtils.File(this.download.target.path);
-        if (file.exists()) {
-          return true;
-        }
-
-        if (!this.download.target.partFilePath) {
-          return false;
-        }
-
-        let partFile = new FileUtils.File(this.download.target.partFilePath);
-        return partFile.exists();
-      }
-      case "cmd_delete":
-      case "downloadsCmd_cancel":
-      case "downloadsCmd_copyLocation":
-      case "downloadsCmd_doDefault":
-        return true;
-      case "downloadsCmd_showBlockedInfo":
-        return this.download.hasBlockedData;
-    }
-    return DownloadsViewUI.DownloadElementShell.prototype
-                          .isCommandEnabled.call(this, aCommand);
-  },
-
-  doCommand(aCommand) {
-    if (this.isCommandEnabled(aCommand)) {
-      this[aCommand]();
-    }
-  },
-
-  //////////////////////////////////////////////////////////////////////////////
-  //// Item commands
-
-  cmd_delete() {
-    DownloadsCommon.removeAndFinalizeDownload(this.download);
-    PlacesUtils.bhistory.removePage(
-                           NetUtil.newURI(this.download.source.url));
-  },
-
-  downloadsCmd_unblock() {
-    DownloadsPanel.hidePanel();
-    this.confirmUnblock(window, "unblock");
-  },
-
-  downloadsCmd_chooseUnblock() {
-    DownloadsPanel.hidePanel();
-    this.confirmUnblock(window, "chooseUnblock");
-  },
-
-  downloadsCmd_unblockAndOpen() {
-    DownloadsPanel.hidePanel();
-    this.unblockAndOpenDownload().catch(Cu.reportError);
-  },
-
-  downloadsCmd_open() {
-    this.download.launch().catch(Cu.reportError);
-
-    // We explicitly close the panel here to give the user the feedback that
-    // their click has been received, and we're handling the action.
-    // Otherwise, we'd have to wait for the file-type handler to execute
-    // before the panel would close. This also helps to prevent the user from
-    // accidentally opening a file several times.
-    DownloadsPanel.hidePanel();
-  },
-
-  downloadsCmd_show() {
-    let file = new FileUtils.File(this.download.target.path);
-    DownloadsCommon.showDownloadedFile(file);
-
-    // We explicitly close the panel here to give the user the feedback that
-    // their click has been received, and we're handling the action.
-    // Otherwise, we'd have to wait for the operating system file manager
-    // window to open before the panel closed. This also helps to prevent the
-    // user from opening the containing folder several times.
-    DownloadsPanel.hidePanel();
-  },
-
-  downloadsCmd_showBlockedInfo() {
-    DownloadsBlockedSubview.toggle(this.element,
-                                   ...this.rawBlockedTitleAndDetails);
-  },
-
-  downloadsCmd_openReferrer() {
-    openURL(this.download.source.referrer);
-  },
-
-  downloadsCmd_copyLocation() {
-    let clipboard = Cc["@mozilla.org/widget/clipboardhelper;1"]
-                    .getService(Ci.nsIClipboardHelper);
-    clipboard.copyString(this.download.source.url);
-  },
-
-  downloadsCmd_doDefault() {
-    let defaultCommand = this.currentDefaultCommandName;
-    if (defaultCommand && this.isCommandEnabled(defaultCommand)) {
-      this.doCommand(defaultCommand);
-    }
-  },
-};
-
-////////////////////////////////////////////////////////////////////////////////
-//// DownloadsViewController
-
-/**
- * Handles part of the user interaction events raised by the downloads list
- * widget, in particular the "commands" that apply to multiple items, and
- * dispatches the commands that apply to individual items.
- */
-const DownloadsViewController = {
-  //////////////////////////////////////////////////////////////////////////////
-  //// Initialization and termination
-
-  initialize() {
-    window.controllers.insertControllerAt(0, this);
-  },
-
-  terminate() {
-    window.controllers.removeController(this);
-  },
-
-  //////////////////////////////////////////////////////////////////////////////
-  //// nsIController
-
-  supportsCommand(aCommand) {
-    if (aCommand === "downloadsCmd_clearList") {
-      return true;
-    }
-    // Firstly, determine if this is a command that we can handle.
-    if (!DownloadsViewUI.isCommandName(aCommand)) {
-      return false;
-    }
-    if (!(aCommand in this) &&
-        !(aCommand in DownloadsViewItem.prototype)) {
-      return false;
-    }
-    // The currently supported commands depend on whether the blocked subview is
-    // showing.  If it is, then take the following path.
-    if (DownloadsBlockedSubview.view.showingSubView) {
-      let blockedSubviewCmds = [
-        "downloadsCmd_unblockAndOpen",
-        "cmd_delete",
-      ];
-      return blockedSubviewCmds.indexOf(aCommand) >= 0;
-    }
-    // If the blocked subview is not showing, then determine if focus is on a
-    // control in the downloads list.
-    let element = document.commandDispatcher.focusedElement;
-    while (element && element != DownloadsView.richListBox) {
-      element = element.parentNode;
-    }
-    // We should handle the command only if the downloads list is among the
-    // ancestors of the focused element.
-    return !!element;
-  },
-
-  isCommandEnabled(aCommand) {
-    // Handle commands that are not selection-specific.
-    if (aCommand == "downloadsCmd_clearList") {
-      return DownloadsCommon.getData(window).canRemoveFinished;
-    }
-
-    // Other commands are selection-specific.
-    let element = DownloadsView.richListBox.selectedItem;
-    return element && DownloadsView.itemForElement(element)
-                                   .isCommandEnabled(aCommand);
-  },
-
-  doCommand(aCommand) {
-    // If this command is not selection-specific, execute it.
-    if (aCommand in this) {
-      this[aCommand]();
-      return;
-    }
-
-    // Other commands are selection-specific.
-    let element = DownloadsView.richListBox.selectedItem;
-    if (element) {
-      // The doCommand function also checks if the command is enabled.
-      DownloadsView.itemForElement(element).doCommand(aCommand);
-    }
-  },
-
-  onEvent() {},
-
-  //////////////////////////////////////////////////////////////////////////////
-  //// Other functions
-
-  updateCommands() {
-    function updateCommandsForObject(object) {
-      for (let name in object) {
-        if (DownloadsViewUI.isCommandName(name)) {
-          goUpdateCommand(name);
-        }
-      }
-    }
-    updateCommandsForObject(this);
-    updateCommandsForObject(DownloadsViewItem.prototype);
-  },
-
-  //////////////////////////////////////////////////////////////////////////////
-  //// Selection-independent commands
-
-  downloadsCmd_clearList() {
-    DownloadsCommon.getData(window).removeFinished();
-  },
-};
-
-XPCOMUtils.defineConstant(this, "DownloadsViewController", DownloadsViewController);
-
-////////////////////////////////////////////////////////////////////////////////
-//// DownloadsSummary
-
-/**
- * Manages the summary at the bottom of the downloads panel list if the number
- * of items in the list exceeds the panels limit.
- */
-const DownloadsSummary = {
-
-  /**
-   * Sets the active state of the summary. When active, the summary subscribes
-   * to the DownloadsCommon DownloadsSummaryData singleton.
-   *
-   * @param aActive
-   *        Set to true to activate the summary.
-   */
-  set active(aActive) {
-    if (aActive == this._active || !this._summaryNode) {
-      return this._active;
-    }
-    if (aActive) {
-      DownloadsCommon.getSummary(window, DownloadsView.kItemCountLimit)
-                     .refreshView(this);
-    } else {
-      DownloadsFooter.showingSummary = false;
-    }
-
-    return this._active = aActive;
-  },
-
-  /**
-   * Returns the active state of the downloads summary.
-   */
-  get active() {
-    return this._active;
-  },
-
-  _active: false,
-
-  /**
-   * Sets whether or not we show the progress bar.
-   *
-   * @param aShowingProgress
-   *        True if we should show the progress bar.
-   */
-  set showingProgress(aShowingProgress) {
-    if (aShowingProgress) {
-      this._summaryNode.setAttribute("inprogress", "true");
-    } else {
-      this._summaryNode.removeAttribute("inprogress");
-    }
-    // If progress isn't being shown, then we simply do not show the summary.
-    return DownloadsFooter.showingSummary = aShowingProgress;
-  },
-
-  /**
-   * Sets the amount of progress that is visible in the progress bar.
-   *
-   * @param aValue
-   *        A value between 0 and 100 to represent the progress of the
-   *        summarized downloads.
-   */
-  set percentComplete(aValue) {
-    if (this._progressNode) {
-      this._progressNode.setAttribute("value", aValue);
-    }
-    return aValue;
-  },
-
-  /**
-   * Sets the description for the download summary.
-   *
-   * @param aValue
-   *        A string representing the description of the summarized
-   *        downloads.
-   */
-  set description(aValue) {
-    if (this._descriptionNode) {
-      this._descriptionNode.setAttribute("value", aValue);
-      this._descriptionNode.setAttribute("tooltiptext", aValue);
-    }
-    return aValue;
-  },
-
-  /**
-   * Sets the details for the download summary, such as the time remaining,
-   * the amount of bytes transferred, etc.
-   *
-   * @param aValue
-   *        A string representing the details of the summarized
-   *        downloads.
-   */
-  set details(aValue) {
-    if (this._detailsNode) {
-      this._detailsNode.setAttribute("value", aValue);
-      this._detailsNode.setAttribute("tooltiptext", aValue);
-    }
-    return aValue;
-  },
-
-  /**
-   * Focuses the root element of the summary.
-   */
-  focus() {
-    if (this._summaryNode) {
-      this._summaryNode.focus();
-    }
-  },
-
-  /**
-   * Respond to keydown events on the Downloads Summary node.
-   *
-   * @param aEvent
-   *        The keydown event being handled.
-   */
-  onKeyDown(aEvent) {
-    if (aEvent.charCode == " ".charCodeAt(0) ||
-        aEvent.keyCode == KeyEvent.DOM_VK_RETURN) {
-      DownloadsPanel.showDownloadsHistory();
-    }
-  },
-
-  /**
-   * Respond to click events on the Downloads Summary node.
-   *
-   * @param aEvent
-   *        The click event being handled.
-   */
-  onClick(aEvent) {
-    DownloadsPanel.showDownloadsHistory();
-  },
-
-  /**
-   * Element corresponding to the root of the downloads summary.
-   */
-  get _summaryNode() {
-    let node = document.getElementById("downloadsSummary");
-    if (!node) {
-      return null;
-    }
-    delete this._summaryNode;
-    return this._summaryNode = node;
-  },
-
-  /**
-   * Element corresponding to the progress bar in the downloads summary.
-   */
-  get _progressNode() {
-    let node = document.getElementById("downloadsSummaryProgress");
-    if (!node) {
-      return null;
-    }
-    delete this._progressNode;
-    return this._progressNode = node;
-  },
-
-  /**
-   * Element corresponding to the main description of the downloads
-   * summary.
-   */
-  get _descriptionNode() {
-    let node = document.getElementById("downloadsSummaryDescription");
-    if (!node) {
-      return null;
-    }
-    delete this._descriptionNode;
-    return this._descriptionNode = node;
-  },
-
-  /**
-   * Element corresponding to the secondary description of the downloads
-   * summary.
-   */
-  get _detailsNode() {
-    let node = document.getElementById("downloadsSummaryDetails");
-    if (!node) {
-      return null;
-    }
-    delete this._detailsNode;
-    return this._detailsNode = node;
-  }
-};
-
-XPCOMUtils.defineConstant(this, "DownloadsSummary", DownloadsSummary);
-
-////////////////////////////////////////////////////////////////////////////////
-//// DownloadsFooter
-
-/**
- * Manages events sent to to the footer vbox, which contains both the
- * DownloadsSummary as well as the "Show All Downloads" button.
- */
-const DownloadsFooter = {
-
-  /**
-   * Focuses the appropriate element within the footer. If the summary
-   * is visible, focus it. If not, focus the "Show All Downloads"
-   * button.
-   */
-  focus() {
-    if (this._showingSummary) {
-      DownloadsSummary.focus();
-    } else {
-      DownloadsView.downloadsHistory.focus();
-    }
-  },
-
-  _showingSummary: false,
-
-  /**
-   * Sets whether or not the Downloads Summary should be displayed in the
-   * footer. If not, the "Show All Downloads" button is shown instead.
-   */
-  set showingSummary(aValue) {
-    if (this._footerNode) {
-      if (aValue) {
-        this._footerNode.setAttribute("showingsummary", "true");
-      } else {
-        this._footerNode.removeAttribute("showingsummary");
-      }
-      if (!aValue && this._showingSummary) {
-        // Make sure the panel's height shrinks when the summary is hidden.
-        DownloadsPanel.setHeightToFit();
-      }
-      this._showingSummary = aValue;
-    }
-    return aValue;
-  },
-
-  /**
-   * Element corresponding to the footer of the downloads panel.
-   */
-  get _footerNode() {
-    let node = document.getElementById("downloadsFooter");
-    if (!node) {
-      return null;
-    }
-    delete this._footerNode;
-    return this._footerNode = node;
-  }
-};
-
-XPCOMUtils.defineConstant(this, "DownloadsFooter", DownloadsFooter);
-
-
-////////////////////////////////////////////////////////////////////////////////
-//// DownloadsBlockedSubview
-
-/**
- * Manages the blocked subview that slides in when you click a blocked download.
- */
-const DownloadsBlockedSubview = {
-
-  get subview() {
-    let subview = document.getElementById("downloadsPanel-blockedSubview");
-    delete this.subview;
-    return this.subview = subview;
-  },
-
-  /**
-   * Elements in the subview.
-   */
-  get elements() {
-    let idSuffixes = [
-      "title",
-      "details1",
-      "details2",
-      "openButton",
-      "deleteButton",
-    ];
-    let elements = idSuffixes.reduce((memo, s) => {
-      memo[s] = document.getElementById("downloadsPanel-blockedSubview-" + s);
-      return memo;
-    }, {});
-    delete this.elements;
-    return this.elements = elements;
-  },
-
-  /**
-   * The multiview that contains both the main view and the subview.
-   */
-  get view() {
-    let view = document.getElementById("downloadsPanel-multiView");
-    delete this.view;
-    return this.view = view;
-  },
-
-  /**
-   * The blocked-download richlistitem element that was clicked to show the
-   * subview.  If the subview is not showing, this is undefined.
-   */
-  element: undefined,
-
-  /**
-   * Slides in the blocked subview.
-   *
-   * @param element
-   *        The blocked-download richlistitem element that was clicked.
-   * @param title
-   *        The title to show in the subview.
-   * @param details
-   *        An array of strings with information about the block.
-   */
-  toggle(element, title, details) {
-    if (this.view.showingSubView) {
-      this.hide();
-      return;
-    }
-
-    this.element = element;
-    element.setAttribute("showingsubview", "true");
-    DownloadsView.subViewOpen = true;
-    DownloadsViewController.updateCommands();
-
-    let e = this.elements;
-    let s = DownloadsCommon.strings;
-    e.title.textContent = title;
-    e.details1.textContent = details[0];
-    e.details2.textContent = details[1];
-    e.openButton.label = s.unblockButtonOpen;
-    e.deleteButton.label = s.unblockButtonConfirmBlock;
-
-    let verdict = element.getAttribute("verdict");
-    this.subview.setAttribute("verdict", verdict);
-    this.subview.addEventListener("ViewHiding", this);
-
-    this.view.showSubView(this.subview.id);
-
-    // Without this, the mainView is more narrow than the panel once all
-    // downloads are removed from the panel.
-    document.getElementById("downloadsPanel-mainView").style.minWidth =
-      window.getComputedStyle(this.view).width;
-  },
-
-  handleEvent(event) {
-    switch (event.type) {
-      case "ViewHiding":
-        this.subview.removeEventListener(event.type, this);
-        this.element.removeAttribute("showingsubview");
-        DownloadsView.subViewOpen = false;
-        delete this.element;
-        break;
-      default:
-        DownloadsCommon.log("Unhandled DownloadsBlockedSubview event: " +
-                            event.type);
-        break;
-    }
-  },
-
-  /**
-   * Slides out the blocked subview and shows the main view.
-   */
-  hide() {
-    this.view.showMainView();
-    // The point of this is to focus the proper element in the panel now that
-    // the main view is showing again.  showPanel handles that.
-    DownloadsPanel.showPanel();
-  },
-
-  /**
-   * Deletes the download and hides the entire panel.
-   */
-  confirmBlock() {
-    goDoCommand("cmd_delete");
-    DownloadsPanel.hidePanel();
-  },
-};
-
-XPCOMUtils.defineConstant(this, "DownloadsBlockedSubview",
-                          DownloadsBlockedSubview);