B2G/gecko/browser/base/content/browser-tabview.js
// On move to group pop showing.
On move to group pop showing.
On move to group pop showing .
function TabView_moveToGroupPopupShowing(event) {
    let numHiddenTabs = gBrowser.tabs.length - gBrowser.visibleTabs.length;
    if (this._window || numHiddenTabs > 0)
      this.updateContextMenu(TabContextMenu.contextTab, event.target);
  }
function TabView_moveToGroupPopupShowing ( event ) { let numHiddenTabs = gBrowser . tabs . length - gBrowser . visibleTabs . length ; if ( this . _window || numHiddenTabs > 0 ) this . updateContextMenu ( TabContextMenu . contextTab , event . target ) ; }
On move to group pop showing.
On move to group pop showing .
// Update the context menu only if Panorama was already initialized or if // there are hidden tabs.