My Firefox add-on is adding a context menu to its browser action (browser toolbar button) using
browser.menus.create() and specifying the “browser_action” context. This context menu item will open an extension page in its own popup window.
Is there a way to get the x and y screen coordinates of the toolbar button from where the right-click originated from? I want to be able to set the position of the popup window so that it is adjacent to the toolbar button from which the context menu item invocation happened.