User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0 Build ID: 20170514030207 Steps to reproduce: Currently you can only have one top-level contextmenu item when using the WebExtensions contextmenus API. This is because ContextMenus/ACTION_MENU_TOP_LEVEL_LIMIT is set to 1. I would like to make three proposals: 1. Allow WebExtensions to provide an override for ContextMenus/ACTION_MENU_TOP_LEVEL_LIMIT in their manifest 2. Increase ContextMenus/ACTION_MENU_TOP_LEVEL_LIMIT to 3 (instead of one) 3. Add an API to set the ContextMenus/ACTION_MENU_TOP_LEVEL_LIMIT from code Any of these is better than none at all.
ACTION_MENU_TOP_LEVEL_LIMIT has nothing to do with this.