Menus - Archive of obsolete content | MDNAn extension will often wish to attach a new command to a menu. To do this, the new menu will need to be laid over the existing menu which the item should be displayed upon. For more information about how to use an overlay to modify a menu, see Using Menus and Popups in Extensions The following tables list the IDs of menus in Firefox that are commonly overlaid upon. Firefox menus Element ID Descri
