Variable aWindow is available that gives access to the window dom element.
*Set current tab as Toggle tab position
Services.prefs.getBranch("extensions.enhancedmiddleclick.").setIntPref("favTabPosition",aWindow.gBrowser.visibleTabs.indexOf(aWindow.gBrowser.tabContainer.selectedItem));
Dispatch a KEY press
Key code reference & initKeyEvent
Toggle Web Developer Tools
let evt = aWindow.document.createEvent('KeyboardEvent');
evt.initKeyEvent("keydown", true, true, aWindow, false, false, false, false, evt.DOM_VK_F12, 0);
aWindow.document.dispatchEvent(evt);
evt = aWindow.document.createEvent('KeyboardEvent');
evt.initKeyEvent("keypress", true, true, aWindow, false, false, false, false, evt.DOM_VK_F12, 0);
aWindow.document.dispatchEvent(evt);
evt = aWindow.document.createEvent('KeyboardEvent');
evt.initKeyEvent("keyup", true, true, aWindow, false, false, false, false, evt.DOM_VK_F12, 0);
aWindow.document.dispatchEvent(evt);
Focus urlBar
aWindow.document.getElementById("urlbar").focus();
Go Back
if(aWindow.gBrowser.canGoBack) { aWindow.gBrowser.goBack(); }
Go Forward
if(aWindow.gBrowser.canGoForward) { aWindow.gBrowser.goForward(); }
Reload
aWindow.gBrowser.reload();
Undo close tab
aWindow.undoCloseTab(0);
Remove current tab
aWindow.gBrowser.removeCurrentTab({animate: true, byMouse: false});
Search selection
let selection = aWindow.getBrowserSelection(); if( selection.length > 0 ) { aWindow.BrowserSearch.loadSearchFromContext(selection); }
When position number is bigger than the number of all tabs in current tab group (visible tabs) it will toggle the last tab. Otherwise it will jump to the tab at specified position. Usually this number is used to quickly toggle pined tabs.