The NativeWindow object is only available to privileged code running on Firefox for Android, and is intended for use by Firefox for Android add-ons.


Returns a reference to the NativeWindow.contextmenus object, which can be used to add items to the Firefox for Android context menu, and subsequently remove them. You can add a menu item to the context menu using NativeWindow.contextmenus.add() and remove it using NativeWindow.contextmenus.remove().

To add a context menu item, you need to supply:

  • name : the name of the item that is displayed to the user
  • selector : determines when the item should be shown. You can use one of a number of predefined selectors, or define your own.
  • callback : a function that is called when the item is selected

NativeWindow.contextmenus.add() returns a menuID which you can subsequently pass into NativeWindow.contextmenus.remove() to remove the item.

A common pattern is for a restartless add-on to add and remove menu items in the add-on's bootstrap.js:

This ensures that the item is always present while the add-on is installed and enabled, and that it is cleaned up properly when the add-on is uninstalled or disabled. But note that bootstrap.js is not attached to a DOM window, so you need to get a window, for example using nsIWindowMediator, before you can use this pattern.


The following example adds a context menu item which is displayed when any element is selected. When the user selects the context menu item, it displays the HTML source for the element in a toast notification:NativeWindow-contextmenus.png

var menuID;

function loadIntoWindow(window) {    
  if (!window)    
  let label = "Show HTML";
  let selector =  window.NativeWindow.contextmenus.SelectorContext("*");
  menuID = window.NativeWindow.contextmenus.add(label, selector, function(target) { , "short");       
function unloadFromWindow(window) {    
  if (!window)    


Add a context menu item.
Remove a context menu item.

See also