e "helpPolicySupport":
          openTrustedLinkIn(Services.policies.getSupportMenu().URL.href, "tab");
          break;
      }
    });

    document
      .getElementById("historyMenuPopup")
      .addEventListener("command", event => {
        // Handle commands/clicks on the descending menuitems that are
        // history entries.
        let historyMenu = document.getElementById("history-menu");
        historyMenu._placesView._onCommand(event);
      });

    let bookmarksMenuPopup = document.getElementById("bookmarksMenuPopup");
    bookmarksMenuPopup.addEventListener("command", event => {
      BookmarksEventHandler.onCommand(event);
    });

    bookmarksMenuPopup.addEventListener("click", event => {
      BookmarksEventHandler.onClick(
        event,
        bookmarksMenuPopup.parentNode._placesView
      );
    });

    bookmarksMenuPopup.addEventListener("mouseup", event => {
      BookmarksEventHandler.onMouseUp(event);
    });

    const bookmarksMenu = document.getElementById("bookmarksMenu");
    bookmarksMenu.addEventListener("dragover", event =>
      PlacesMenuDNDHandler.onDragOver(event)
    );
    bookmarksMenu.addEventListener("dragenter", event =>
      PlacesMenuDNDHandler.onDragEnter(event)
    );
    bookmarksMenu.addEventListener("dragleave", event =>
      PlacesMenuDNDHandler.onDragLeave(event)
    );
    bookmarksMenu.addEventListener("drop", event =>
      PlacesMenuDNDHandler.onDrop(event)
    );

    mainMenuBar.addEventListener("popupshowing", event => {
      // On macOS, we don't track whether activation of the native menubar happened
      // with the keyboard.
      if (AppConstants.platform != "macosx") {
        // We only set the "openedwithkey" if a specific menu like "Edit" was opened
        // instead of the general menu bar. (e.g. Alt+E instead of just Alt)
        if (event.target.parentNode.parentNode == this) {
          this.setAttribute(
            "openedwithkey",
            event.target.parentNode.openedWithKey
          );
        }
      }

      switch (event.target.id) {
        case "menu_FilePopup":
          gFileMenu.onPopupShowing(event);
          break;
        case "menu_newUserContextPopup":
          createUserContextMenu(event);
          break;
        case "menu_EditPopup":
          updateEditUIVisibility();
          break;
        case "view-menu-popup":
          ToolbarContextMenu.onViewToolbarsPopupShowing(event);
          break;
        case "pageStyleMenuPopup":
          gPageStyleMenu.fillPopup(event.target);
          break;
        case "historyMenuPopup":
          if (!event.target.parentNode._placesView) {
            new HistoryMenu(event);
          }

          AIWindow.appMenu(event, window);
          break;
        case "historyUndoPopup":
          document
            .getElementById("history-menu")
            ._placesView.populateUndoSubmenu();
          break;
        case "historyUndoWindowPopup":
          document
            .getElementById("history-menu")
            ._placesView.populateUndoWindowSubmenu();
          break;
        case "bookmarksMenuPopup":
          BookmarkingUI.onMainMenuPopupShowing(event);
          if (!event.target.parentNode._placesView) {
            new PlacesMenu(
              event,
              `place:parent=${PlacesUtils.bookmarks.menuGuid}`
            );
          }
          break;
        case "bookmarksToolbarFolderPopup":
          if (!event.target.parentNode._placesView) {
            new PlacesMenu(
              event,
              `place:parent=${PlacesUtils.bookmarks.toolbarGuid}`
            );
          }
          break;
        case "otherBookmarksFolderPopup":
          if (!event.target.parentNode._placesView) {
            new PlacesMenu(
              event,
              `place:parent=${PlacesUtils.bookmarks.unfiledGuid}`
            );
          }
          break;
        case "mobileBookmarksFolderPopup":
          if (!event.target.parentNode._placesView) {
            new PlacesMenu(
              event,
              `place:parent=${PlacesUtils.bookmarks.mobileGuid}`
            );
          }
          break;
        case "menu_HelpPopup":
          buildHelpMenu();
          break;
        case "menu_ProfilesPopup":
          gProfiles.onPopupShowing(event);
          break;
      }
    });

    document
      .getElementById("menu_EditPopup")
      .addEventListener("popuphidden", () => {
        updateEditUIVisibility();
      });
  },
  { once: true }
);
PK