Adding upstream version 115.8.0esr.upstream/115.8.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1015 insertions, 0 deletions

diff --git a/browser/base/content/browser-pageActions.js b/browser/base/content/browser-pageActions.js
new file mode 100644
index 0000000000..1cc895434d
--- /dev/null
+++ b/browser/base/content/browser-pageActions.js
@@ -0,0 +1,1015 @@
+/* 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/. */
+
+ChromeUtils.defineESModuleGetters(this, {
+  SearchUIUtils: "resource:///modules/SearchUIUtils.sys.mjs",
+});
+
+var BrowserPageActions = {
+  _panelNode: null,
+  /**
+   * The main page action button in the urlbar (DOM node)
+   */
+  get mainButtonNode() {
+    delete this.mainButtonNode;
+    return (this.mainButtonNode = document.getElementById("pageActionButton"));
+  },
+
+  /**
+   * The main page action panel DOM node (DOM node)
+   */
+  get panelNode() {
+    // Lazy load the page action panel the first time we need to display it
+    if (!this._panelNode) {
+      this.initializePanel();
+    }
+    delete this.panelNode;
+    return (this.panelNode = this._panelNode);
+  },
+
+  /**
+   * The panelmultiview node in the main page action panel (DOM node)
+   */
+  get multiViewNode() {
+    delete this.multiViewNode;
+    return (this.multiViewNode = document.getElementById(
+      "pageActionPanelMultiView"
+    ));
+  },
+
+  /**
+   * The main panelview node in the main page action panel (DOM node)
+   */
+  get mainViewNode() {
+    delete this.mainViewNode;
+    return (this.mainViewNode = document.getElementById(
+      "pageActionPanelMainView"
+    ));
+  },
+
+  /**
+   * The vbox body node in the main panelview node (DOM node)
+   */
+  get mainViewBodyNode() {
+    delete this.mainViewBodyNode;
+    return (this.mainViewBodyNode = this.mainViewNode.querySelector(
+      ".panel-subview-body"
+    ));
+  },
+
+  /**
+   * Inits.  Call to init.
+   */
+  init() {
+    this.placeAllActionsInUrlbar();
+    this._onPanelShowing = this._onPanelShowing.bind(this);
+  },
+
+  _onPanelShowing() {
+    this.initializePanel();
+    for (let action of PageActions.actionsInPanel(window)) {
+      let buttonNode = this.panelButtonNodeForActionID(action.id);
+      action.onShowingInPanel(buttonNode);
+    }
+  },
+
+  placeLazyActionsInPanel() {
+    let actions = this._actionsToLazilyPlaceInPanel;
+    this._actionsToLazilyPlaceInPanel = [];
+    for (let action of actions) {
+      this._placeActionInPanelNow(action);
+    }
+  },
+
+  // Actions placed in the panel aren't actually placed until the panel is
+  // subsequently opened.
+  _actionsToLazilyPlaceInPanel: [],
+
+  /**
+   * Places all registered actions in the urlbar.
+   */
+  placeAllActionsInUrlbar() {
+    let urlbarActions = PageActions.actionsInUrlbar(window);
+    for (let action of urlbarActions) {
+      this.placeActionInUrlbar(action);
+    }
+    this._updateMainButtonAttributes();
+  },
+
+  /**
+   * Initializes the panel if necessary.
+   */
+  initializePanel() {
+    // Lazy load the page action panel the first time we need to display it
+    if (!this._panelNode) {
+      let template = document.getElementById("pageActionPanelTemplate");
+      template.replaceWith(template.content);
+      this._panelNode = document.getElementById("pageActionPanel");
+      this._panelNode.addEventListener("popupshowing", this._onPanelShowing);
+    }
+
+    for (let action of PageActions.actionsInPanel(window)) {
+      this.placeActionInPanel(action);
+    }
+    this.placeLazyActionsInPanel();
+  },
+
+  /**
+   * Adds or removes as necessary DOM nodes for the given action.
+   *
+   * @param  action (PageActions.Action, required)
+   *         The action to place.
+   */
+  placeAction(action) {
+    this.placeActionInPanel(action);
+    this.placeActionInUrlbar(action);
+    this._updateMainButtonAttributes();
+  },
+
+  /**
+   * Adds or removes as necessary DOM nodes for the action in the panel.
+   *
+   * @param  action (PageActions.Action, required)
+   *         The action to place.
+   */
+  placeActionInPanel(action) {
+    if (this._panelNode && this.panelNode.state != "closed") {
+      this._placeActionInPanelNow(action);
+    } else {
+      // This method may be called for the same action more than once
+      // (e.g. when an extension does call pageAction.show/hidden to
+      // enable or disable its own pageAction and we will have to
+      // update the urlbar overflow panel accordingly).
+      //
+      // Ensure we don't add the same actions more than once (otherwise we will
+      // not remove all the entries in _removeActionFromPanel).
+      if (
+        this._actionsToLazilyPlaceInPanel.findIndex(a => a.id == action.id) >= 0
+      ) {
+        return;
+      }
+      // Lazily place the action in the panel the next time it opens.
+      this._actionsToLazilyPlaceInPanel.push(action);
+    }
+  },
+
+  _placeActionInPanelNow(action) {
+    if (action.shouldShowInPanel(window)) {
+      this._addActionToPanel(action);
+    } else {
+      this._removeActionFromPanel(action);
+    }
+  },
+
+  _addActionToPanel(action) {
+    let id = this.panelButtonNodeIDForActionID(action.id);
+    let node = document.getElementById(id);
+    if (node) {
+      return;
+    }
+    this._maybeNotifyBeforePlacedInWindow(action);
+    node = this._makePanelButtonNodeForAction(action);
+    node.id = id;
+    let insertBeforeNode = this._getNextNode(action, false);
+    this.mainViewBodyNode.insertBefore(node, insertBeforeNode);
+    this.updateAction(action, null, {
+      panelNode: node,
+    });
+    this._updateActionDisabledInPanel(action, node);
+    action.onPlacedInPanel(node);
+    this._addOrRemoveSeparatorsInPanel();
+  },
+
+  _removeActionFromPanel(action) {
+    let lazyIndex = this._actionsToLazilyPlaceInPanel.findIndex(
+      a => a.id == action.id
+    );
+    if (lazyIndex >= 0) {
+      this._actionsToLazilyPlaceInPanel.splice(lazyIndex, 1);
+    }
+    let node = this.panelButtonNodeForActionID(action.id);
+    if (!node) {
+      return;
+    }
+    node.remove();
+    if (action.getWantsSubview(window)) {
+      let panelViewNodeID = this._panelViewNodeIDForActionID(action.id, false);
+      let panelViewNode = document.getElementById(panelViewNodeID);
+      if (panelViewNode) {
+        panelViewNode.remove();
+      }
+    }
+    this._addOrRemoveSeparatorsInPanel();
+  },
+
+  _addOrRemoveSeparatorsInPanel() {
+    let actions = PageActions.actionsInPanel(window);
+    let ids = [
+      PageActions.ACTION_ID_BUILT_IN_SEPARATOR,
+      PageActions.ACTION_ID_TRANSIENT_SEPARATOR,
+    ];
+    for (let id of ids) {
+      let sep = actions.find(a => a.id == id);
+      if (sep) {
+        this._addActionToPanel(sep);
+      } else {
+        let node = this.panelButtonNodeForActionID(id);
+        if (node) {
+          node.remove();
+        }
+      }
+    }
+  },
+
+  _updateMainButtonAttributes() {
+    this.mainButtonNode.toggleAttribute(
+      "multiple-children",
+      PageActions.actions.length > 1
+    );
+  },
+
+  /**
+   * Returns the node before which an action's node should be inserted.
+   *
+   * @param  action (PageActions.Action, required)
+   *         The action that will be inserted.
+   * @param  forUrlbar (bool, required)
+   *         True if you're inserting into the urlbar, false if you're inserting
+   *         into the panel.
+   * @return (DOM node, maybe null) The DOM node before which to insert the
+   *         given action.  Null if the action should be inserted at the end.
+   */
+  _getNextNode(action, forUrlbar) {
+    let actions = forUrlbar
+      ? PageActions.actionsInUrlbar(window)
+      : PageActions.actionsInPanel(window);
+    let index = actions.findIndex(a => a.id == action.id);
+    if (index < 0) {
+      return null;
+    }
+    for (let i = index + 1; i < actions.length; i++) {
+      let node = forUrlbar
+        ? this.urlbarButtonNodeForActionID(actions[i].id)
+        : this.panelButtonNodeForActionID(actions[i].id);
+      if (node) {
+        return node;
+      }
+    }
+    return null;
+  },
+
+  _maybeNotifyBeforePlacedInWindow(action) {
+    if (!this._isActionPlacedInWindow(action)) {
+      action.onBeforePlacedInWindow(window);
+    }
+  },
+
+  _isActionPlacedInWindow(action) {
+    if (this.panelButtonNodeForActionID(action.id)) {
+      return true;
+    }
+    let urlbarNode = this.urlbarButtonNodeForActionID(action.id);
+    return urlbarNode && !urlbarNode.hidden;
+  },
+
+  _makePanelButtonNodeForAction(action) {
+    if (action.__isSeparator) {
+      let node = document.createXULElement("toolbarseparator");
+      return node;
+    }
+    let buttonNode = document.createXULElement("toolbarbutton");
+    buttonNode.classList.add(
+      "subviewbutton",
+      "subviewbutton-iconic",
+      "pageAction-panel-button"
+    );
+    if (action.isBadged) {
+      buttonNode.setAttribute("badged", "true");
+    }
+    buttonNode.setAttribute("actionid", action.id);
+    buttonNode.addEventListener("command", event => {
+      this.doCommandForAction(action, event, buttonNode);
+    });
+    return buttonNode;
+  },
+
+  _makePanelViewNodeForAction(action, forUrlbar) {
+    let panelViewNode = document.createXULElement("panelview");
+    panelViewNode.id = this._panelViewNodeIDForActionID(action.id, forUrlbar);
+    panelViewNode.classList.add("PanelUI-subView");
+    let bodyNode = document.createXULElement("vbox");
+    bodyNode.id = panelViewNode.id + "-body";
+    bodyNode.classList.add("panel-subview-body");
+    panelViewNode.appendChild(bodyNode);
+    return panelViewNode;
+  },
+
+  /**
+   * Shows or hides a panel for an action.  You can supply your own panel;
+   * otherwise one is created.
+   *
+   * @param  action (PageActions.Action, required)
+   *         The action for which to toggle the panel.  If the action is in the
+   *         urlbar, then the panel will be anchored to it.  Otherwise, a
+   *         suitable anchor will be used.
+   * @param  panelNode (DOM node, optional)
+   *         The panel to use.  This method takes a hands-off approach with
+   *         regard to your panel in terms of attributes, styling, etc.
+   * @param  event (DOM event, optional)
+   *         The event which triggered this panel.
+   */
+  togglePanelForAction(action, panelNode = null, event = null) {
+    let aaPanelNode = this.activatedActionPanelNode;
+    if (panelNode) {
+      // Note that this particular code path will not prevent the panel from
+      // opening later if PanelMultiView.showPopup was called but the panel has
+      // not been opened yet.
+      if (panelNode.state != "closed") {
+        PanelMultiView.hidePopup(panelNode);
+        return;
+      }
+      if (aaPanelNode) {
+        PanelMultiView.hidePopup(aaPanelNode);
+      }
+    } else if (aaPanelNode) {
+      PanelMultiView.hidePopup(aaPanelNode);
+      return;
+    } else {
+      panelNode = this._makeActivatedActionPanelForAction(action);
+    }
+
+    // Hide the main panel before showing the action's panel.
+    PanelMultiView.hidePopup(this.panelNode);
+
+    let anchorNode = this.panelAnchorNodeForAction(action);
+    PanelMultiView.openPopup(panelNode, anchorNode, {
+      position: "bottomright topright",
+      triggerEvent: event,
+    }).catch(console.error);
+  },
+
+  _makeActivatedActionPanelForAction(action) {
+    let panelNode = document.createXULElement("panel");
+    panelNode.id = this._activatedActionPanelID;
+    panelNode.classList.add("cui-widget-panel", "panel-no-padding");
+    panelNode.setAttribute("actionID", action.id);
+    panelNode.setAttribute("role", "group");
+    panelNode.setAttribute("type", "arrow");
+    panelNode.setAttribute("flip", "slide");
+    panelNode.setAttribute("noautofocus", "true");
+    panelNode.setAttribute("tabspecific", "true");
+
+    let panelViewNode = null;
+    let iframeNode = null;
+
+    if (action.getWantsSubview(window)) {
+      let multiViewNode = document.createXULElement("panelmultiview");
+      panelViewNode = this._makePanelViewNodeForAction(action, true);
+      multiViewNode.setAttribute("mainViewId", panelViewNode.id);
+      multiViewNode.appendChild(panelViewNode);
+      panelNode.appendChild(multiViewNode);
+    } else if (action.wantsIframe) {
+      iframeNode = document.createXULElement("iframe");
+      iframeNode.setAttribute("type", "content");
+      panelNode.appendChild(iframeNode);
+    }
+
+    let popupSet = document.getElementById("mainPopupSet");
+    popupSet.appendChild(panelNode);
+    panelNode.addEventListener(
+      "popuphidden",
+      () => {
+        PanelMultiView.removePopup(panelNode);
+      },
+      { once: true }
+    );
+
+    if (iframeNode) {
+      panelNode.addEventListener(
+        "popupshowing",
+        () => {
+          action.onIframeShowing(iframeNode, panelNode);
+        },
+        { once: true }
+      );
+      panelNode.addEventListener(
+        "popupshown",
+        () => {
+          iframeNode.focus();
+        },
+        { once: true }
+      );
+      panelNode.addEventListener(
+        "popuphiding",
+        () => {
+          action.onIframeHiding(iframeNode, panelNode);
+        },
+        { once: true }
+      );
+      panelNode.addEventListener(
+        "popuphidden",
+        () => {
+          action.onIframeHidden(iframeNode, panelNode);
+        },
+        { once: true }
+      );
+    }
+
+    if (panelViewNode) {
+      action.onSubviewPlaced(panelViewNode);
+      panelNode.addEventListener(
+        "popupshowing",
+        () => {
+          action.onSubviewShowing(panelViewNode);
+        },
+        { once: true }
+      );
+    }
+
+    return panelNode;
+  },
+
+  /**
+   * Returns the node in the urlbar to which popups for the given action should
+   * be anchored.  If the action is null, a sensible anchor is returned.
+   *
+   * @param  action (PageActions.Action, optional)
+   *         The action you want to anchor.
+   * @param  event (DOM event, optional)
+   *         This is used to display the feedback panel on the right node when
+   *         the command can be invoked from both the main panel and another
+   *         location, such as an activated action panel or a button.
+   * @return (DOM node) The node to which the action should be anchored.
+   */
+  panelAnchorNodeForAction(action, event) {
+    if (event && event.target.closest("panel") == this.panelNode) {
+      return this.mainButtonNode;
+    }
+
+    // Try each of the following nodes in order, using the first that's visible.
+    let potentialAnchorNodeIDs = [
+      action && action.anchorIDOverride,
+      action && this.urlbarButtonNodeIDForActionID(action.id),
+      this.mainButtonNode.id,
+      "identity-icon",
+      "urlbar-search-button",
+    ];
+    for (let id of potentialAnchorNodeIDs) {
+      if (id) {
+        let node = document.getElementById(id);
+        if (node && !node.hidden) {
+          let bounds = window.windowUtils.getBoundsWithoutFlushing(node);
+          if (bounds.height > 0 && bounds.width > 0) {
+            return node;
+          }
+        }
+      }
+    }
+    let id = action ? action.id : "<no action>";
+    throw new Error(`PageActions: No anchor node for ${id}`);
+  },
+
+  get activatedActionPanelNode() {
+    return document.getElementById(this._activatedActionPanelID);
+  },
+
+  get _activatedActionPanelID() {
+    return "pageActionActivatedActionPanel";
+  },
+
+  /**
+   * Adds or removes as necessary a DOM node for the given action in the urlbar.
+   *
+   * @param  action (PageActions.Action, required)
+   *         The action to place.
+   */
+  placeActionInUrlbar(action) {
+    let id = this.urlbarButtonNodeIDForActionID(action.id);
+    let node = document.getElementById(id);
+
+    if (!action.shouldShowInUrlbar(window)) {
+      if (node) {
+        if (action.__urlbarNodeInMarkup) {
+          node.hidden = true;
+        } else {
+          node.remove();
+        }
+      }
+      return;
+    }
+
+    let newlyPlaced = false;
+    if (action.__urlbarNodeInMarkup) {
+      this._maybeNotifyBeforePlacedInWindow(action);
+      // Allow the consumer to add the node in response to the
+      // onBeforePlacedInWindow notification.
+      node = document.getElementById(id);
+      if (!node) {
+        return;
+      }
+      newlyPlaced = node.hidden;
+      node.hidden = false;
+    } else if (!node) {
+      newlyPlaced = true;
+      this._maybeNotifyBeforePlacedInWindow(action);
+      node = this._makeUrlbarButtonNode(action);
+      node.id = id;
+    }
+
+    if (!newlyPlaced) {
+      return;
+    }
+
+    let insertBeforeNode = this._getNextNode(action, true);
+    this.mainButtonNode.parentNode.insertBefore(node, insertBeforeNode);
+    this.updateAction(action, null, {
+      urlbarNode: node,
+    });
+    action.onPlacedInUrlbar(node);
+  },
+
+  _makeUrlbarButtonNode(action) {
+    let buttonNode = document.createXULElement("hbox");
+    buttonNode.classList.add("urlbar-page-action");
+    if (action.extensionID) {
+      buttonNode.classList.add("urlbar-addon-page-action");
+    }
+    buttonNode.setAttribute("actionid", action.id);
+    buttonNode.setAttribute("role", "button");
+    let commandHandler = event => {
+      this.doCommandForAction(action, event, buttonNode);
+    };
+    buttonNode.addEventListener("click", commandHandler);
+    buttonNode.addEventListener("keypress", commandHandler);
+
+    let imageNode = document.createXULElement("image");
+    imageNode.classList.add("urlbar-icon");
+    buttonNode.appendChild(imageNode);
+    return buttonNode;
+  },
+
+  /**
+   * Removes all the DOM nodes of the given action.
+   *
+   * @param  action (PageActions.Action, required)
+   *         The action to remove.
+   */
+  removeAction(action) {
+    this._removeActionFromPanel(action);
+    this._removeActionFromUrlbar(action);
+    action.onRemovedFromWindow(window);
+    this._updateMainButtonAttributes();
+  },
+
+  _removeActionFromUrlbar(action) {
+    let node = this.urlbarButtonNodeForActionID(action.id);
+    if (node) {
+      node.remove();
+    }
+  },
+
+  /**
+   * Updates the DOM nodes of an action to reflect either a changed property or
+   * all properties.
+   *
+   * @param  action (PageActions.Action, required)
+   *         The action to update.
+   * @param  propertyName (string, optional)
+   *         The name of the property to update.  If not given, then DOM nodes
+   *         will be updated to reflect the current values of all properties.
+   * @param  opts (object, optional)
+   *         - panelNode: The action's node in the panel to update.
+   *         - urlbarNode: The action's node in the urlbar to update.
+   *         - value: If a property name is passed, this argument may contain
+   *           its current value, in order to prevent a further look-up.
+   */
+  updateAction(action, propertyName = null, opts = {}) {
+    let anyNodeGiven = "panelNode" in opts || "urlbarNode" in opts;
+    let panelNode = anyNodeGiven
+      ? opts.panelNode || null
+      : this.panelButtonNodeForActionID(action.id);
+    let urlbarNode = anyNodeGiven
+      ? opts.urlbarNode || null
+      : this.urlbarButtonNodeForActionID(action.id);
+    let value = opts.value || undefined;
+    if (propertyName) {
+      this[this._updateMethods[propertyName]](
+        action,
+        panelNode,
+        urlbarNode,
+        value
+      );
+    } else {
+      for (let name of ["iconURL", "title", "tooltip", "wantsSubview"]) {
+        this[this._updateMethods[name]](action, panelNode, urlbarNode, value);
+      }
+    }
+  },
+
+  _updateMethods: {
+    disabled: "_updateActionDisabled",
+    iconURL: "_updateActionIconURL",
+    title: "_updateActionLabeling",
+    tooltip: "_updateActionTooltip",
+    wantsSubview: "_updateActionWantsSubview",
+  },
+
+  _updateActionDisabled(
+    action,
+    panelNode,
+    urlbarNode,
+    disabled = action.getDisabled(window)
+  ) {
+    // Extension page actions should behave like a transient action,
+    // and be hidden from the urlbar overflow menu if they
+    // are disabled (as in the urlbar when the overflow menu isn't available)
+    //
+    // TODO(Bug 1704139): as a follow up we may look into just set on all
+    // extension pageActions `_transient: true`, at least once we sunset
+    // the proton preference and we don't need the pre-Proton behavior anymore,
+    // and remove this special case.
+    const isProtonExtensionAction = action.extensionID;
+
+    if (action.__transient || isProtonExtensionAction) {
+      this.placeActionInPanel(action);
+    } else {
+      this._updateActionDisabledInPanel(action, panelNode, disabled);
+    }
+    this.placeActionInUrlbar(action);
+  },
+
+  _updateActionDisabledInPanel(
+    action,
+    panelNode,
+    disabled = action.getDisabled(window)
+  ) {
+    if (panelNode) {
+      if (disabled) {
+        panelNode.setAttribute("disabled", "true");
+      } else {
+        panelNode.removeAttribute("disabled");
+      }
+    }
+  },
+
+  _updateActionIconURL(
+    action,
+    panelNode,
+    urlbarNode,
+    properties = action.getIconProperties(window)
+  ) {
+    for (let [prop, value] of Object.entries(properties)) {
+      if (panelNode) {
+        panelNode.style.setProperty(prop, value);
+      }
+      if (urlbarNode) {
+        urlbarNode.style.setProperty(prop, value);
+      }
+    }
+  },
+
+  _updateActionLabeling(
+    action,
+    panelNode,
+    urlbarNode,
+    title = action.getTitle(window)
+  ) {
+    if (panelNode) {
+      panelNode.setAttribute("label", title);
+    }
+    if (urlbarNode) {
+      urlbarNode.setAttribute("aria-label", title);
+      // tooltiptext falls back to the title, so update it too if necessary.
+      let tooltip = action.getTooltip(window);
+      if (!tooltip) {
+        urlbarNode.setAttribute("tooltiptext", title);
+      }
+    }
+  },
+
+  _updateActionTooltip(
+    action,
+    panelNode,
+    urlbarNode,
+    tooltip = action.getTooltip(window)
+  ) {
+    if (urlbarNode) {
+      if (!tooltip) {
+        tooltip = action.getTitle(window);
+      }
+      if (tooltip) {
+        urlbarNode.setAttribute("tooltiptext", tooltip);
+      }
+    }
+  },
+
+  _updateActionWantsSubview(
+    action,
+    panelNode,
+    urlbarNode,
+    wantsSubview = action.getWantsSubview(window)
+  ) {
+    if (!panelNode) {
+      return;
+    }
+    let panelViewID = this._panelViewNodeIDForActionID(action.id, false);
+    let panelViewNode = document.getElementById(panelViewID);
+    panelNode.classList.toggle("subviewbutton-nav", wantsSubview);
+    if (!wantsSubview) {
+      if (panelViewNode) {
+        panelViewNode.remove();
+      }
+      return;
+    }
+    if (!panelViewNode) {
+      panelViewNode = this._makePanelViewNodeForAction(action, false);
+      this.multiViewNode.appendChild(panelViewNode);
+      action.onSubviewPlaced(panelViewNode);
+    }
+  },
+
+  doCommandForAction(action, event, buttonNode) {
+    if (event && event.type == "click" && event.button != 0) {
+      return;
+    }
+    if (event && event.type == "keypress") {
+      if (event.key != " " && event.key != "Enter") {
+        return;
+      }
+      event.stopPropagation();
+    }
+    // If we're in the panel, open a subview inside the panel:
+    // Note that we can't use this.panelNode.contains(buttonNode) here
+    // because of XBL boundaries breaking Element.contains.
+    if (
+      action.getWantsSubview(window) &&
+      buttonNode &&
+      buttonNode.closest("panel") == this.panelNode
+    ) {
+      let panelViewNodeID = this._panelViewNodeIDForActionID(action.id, false);
+      let panelViewNode = document.getElementById(panelViewNodeID);
+      action.onSubviewShowing(panelViewNode);
+      this.multiViewNode.showSubView(panelViewNode, buttonNode);
+      return;
+    }
+    // Otherwise, hide the main popup in case it was open:
+    PanelMultiView.hidePopup(this.panelNode);
+
+    let aaPanelNode = this.activatedActionPanelNode;
+    if (!aaPanelNode || aaPanelNode.getAttribute("actionID") != action.id) {
+      action.onCommand(event, buttonNode);
+    }
+    if (action.getWantsSubview(window) || action.wantsIframe) {
+      this.togglePanelForAction(action, null, event);
+    }
+  },
+
+  /**
+   * Returns the action for a node.
+   *
+   * @param  node (DOM node, required)
+   *         A button DOM node, either one that's shown in the page action panel
+   *         or the urlbar.
+   * @return (PageAction.Action) If the node has a related action and the action
+   *         is not a separator, then the action is returned.  Otherwise null is
+   *         returned.
+   */
+  actionForNode(node) {
+    if (!node) {
+      return null;
+    }
+    let actionID = this._actionIDForNodeID(node.id);
+    let action = PageActions.actionForID(actionID);
+    if (!action) {
+      // When a page action is clicked, `node` will be an ancestor of
+      // a node corresponding to an action. `node` will be the page action node
+      // itself when a page action is selected with the keyboard. That's because
+      // the semantic meaning of page action is on an hbox that contains an
+      // <image>.
+      for (let n = node.parentNode; n && !action; n = n.parentNode) {
+        if (n.id == "page-action-buttons" || n.localName == "panelview") {
+          // We reached the page-action-buttons or panelview container.
+          // Stop looking; no action was found.
+          break;
+        }
+        actionID = this._actionIDForNodeID(n.id);
+        action = PageActions.actionForID(actionID);
+      }
+    }
+    return action && !action.__isSeparator ? action : null;
+  },
+
+  /**
+   * The given action's top-level button in the main panel.
+   *
+   * @param  actionID (string, required)
+   *         The action ID.
+   * @return (DOM node) The action's button in the main panel.
+   */
+  panelButtonNodeForActionID(actionID) {
+    return document.getElementById(this.panelButtonNodeIDForActionID(actionID));
+  },
+
+  /**
+   * The ID of the given action's top-level button in the main panel.
+   *
+   * @param  actionID (string, required)
+   *         The action ID.
+   * @return (string) The ID of the action's button in the main panel.
+   */
+  panelButtonNodeIDForActionID(actionID) {
+    return `pageAction-panel-${actionID}`;
+  },
+
+  /**
+   * The given action's button in the urlbar.
+   *
+   * @param  actionID (string, required)
+   *         The action ID.
+   * @return (DOM node) The action's urlbar button node.
+   */
+  urlbarButtonNodeForActionID(actionID) {
+    return document.getElementById(
+      this.urlbarButtonNodeIDForActionID(actionID)
+    );
+  },
+
+  /**
+   * The ID of the given action's button in the urlbar.
+   *
+   * @param  actionID (string, required)
+   *         The action ID.
+   * @return (string) The ID of the action's urlbar button node.
+   */
+  urlbarButtonNodeIDForActionID(actionID) {
+    let action = PageActions.actionForID(actionID);
+    if (action && action.urlbarIDOverride) {
+      return action.urlbarIDOverride;
+    }
+    return `pageAction-urlbar-${actionID}`;
+  },
+
+  // The ID of the given action's panelview.
+  _panelViewNodeIDForActionID(actionID, forUrlbar) {
+    let placementID = forUrlbar ? "urlbar" : "panel";
+    return `pageAction-${placementID}-${actionID}-subview`;
+  },
+
+  // The ID of the action corresponding to the given top-level button in the
+  // panel or button in the urlbar.
+  _actionIDForNodeID(nodeID) {
+    if (!nodeID) {
+      return null;
+    }
+    let match = nodeID.match(/^pageAction-(?:panel|urlbar)-(.+)$/);
+    if (match) {
+      return match[1];
+    }
+    // Check all the urlbar ID overrides.
+    for (let action of PageActions.actions) {
+      if (action.urlbarIDOverride && action.urlbarIDOverride == nodeID) {
+        return action.id;
+      }
+    }
+    return null;
+  },
+
+  /**
+   * Call this when the main page action button in the urlbar is activated.
+   *
+   * @param  event (DOM event, required)
+   *         The click or whatever event.
+   */
+  mainButtonClicked(event) {
+    event.stopPropagation();
+    if (
+      // On mac, ctrl-click will send a context menu event from the widget, so
+      // we don't want to bring up the panel when ctrl key is pressed.
+      (event.type == "mousedown" &&
+        (event.button != 0 ||
+          (AppConstants.platform == "macosx" && event.ctrlKey))) ||
+      (event.type == "keypress" &&
+        event.charCode != KeyEvent.DOM_VK_SPACE &&
+        event.keyCode != KeyEvent.DOM_VK_RETURN)
+    ) {
+      return;
+    }
+
+    // If the activated-action panel is open and anchored to the main button,
+    // close it.
+    let panelNode = this.activatedActionPanelNode;
+    if (panelNode && panelNode.anchorNode.id == this.mainButtonNode.id) {
+      PanelMultiView.hidePopup(panelNode);
+      return;
+    }
+
+    if (this.panelNode.state == "open") {
+      PanelMultiView.hidePopup(this.panelNode);
+    } else if (this.panelNode.state == "closed") {
+      this.showPanel(event);
+    }
+  },
+
+  /**
+   * Show the page action panel
+   *
+   * @param  event (DOM event, optional)
+   *         The event that triggers showing the panel. (such as a mouse click,
+   *         if the user clicked something to open the panel)
+   */
+  showPanel(event = null) {
+    this.panelNode.hidden = false;
+    PanelMultiView.openPopup(this.panelNode, this.mainButtonNode, {
+      position: "bottomright topright",
+      triggerEvent: event,
+    }).catch(console.error);
+  },
+
+  /**
+   * Call this on the context menu's popupshowing event.
+   *
+   * @param  event (DOM event, required)
+   *         The popupshowing event.
+   * @param  popup (DOM node, required)
+   *         The context menu popup DOM node.
+   */
+  async onContextMenuShowing(event, popup) {
+    if (event.target != popup) {
+      return;
+    }
+
+    let action = this.actionForNode(popup.triggerNode);
+    // Only extension actions provide a context menu.
+    if (!action?.extensionID) {
+      this._contextAction = null;
+      event.preventDefault();
+      return;
+    }
+    this._contextAction = action;
+
+    let removeExtension = popup.querySelector(".removeExtensionItem");
+    let { extensionID } = this._contextAction;
+    let addon = extensionID && (await AddonManager.getAddonByID(extensionID));
+    removeExtension.hidden = !addon;
+    if (addon) {
+      removeExtension.disabled = !(
+        addon.permissions & AddonManager.PERM_CAN_UNINSTALL
+      );
+    }
+  },
+
+  /**
+   * Call this from the menu item in the context menu that opens about:addons.
+   */
+  openAboutAddonsForContextAction() {
+    if (!this._contextAction) {
+      return;
+    }
+    let action = this._contextAction;
+    this._contextAction = null;
+
+    let viewID = "addons://detail/" + encodeURIComponent(action.extensionID);
+    window.BrowserOpenAddonsMgr(viewID);
+  },
+
+  /**
+   * Call this from the menu item in the context menu that removes an add-on.
+   */
+  removeExtensionForContextAction() {
+    if (!this._contextAction) {
+      return;
+    }
+    let action = this._contextAction;
+    this._contextAction = null;
+
+    BrowserAddonUI.removeAddon(action.extensionID, "pageAction");
+  },
+
+  _contextAction: null,
+
+  /**
+   * Call this on tab switch or when the current <browser>'s location changes.
+   */
+  onLocationChange() {
+    for (let action of PageActions.actions) {
+      action.onLocationChange(window);
+    }
+  },
+};
+
+// built-in actions below //////////////////////////////////////////////////////
+
+// bookmark
+BrowserPageActions.bookmark = {
+  onShowingInPanel(buttonNode) {
+    if (buttonNode.label == "null") {
+      BookmarkingUI.updateBookmarkPageMenuItem();
+    }
+  },
+
+  onCommand(event, buttonNode) {
+    PanelMultiView.hidePopup(BrowserPageActions.panelNode);
+    BookmarkingUI.onStarCommand(event);
+  },
+};