The maximum number of top level extension items that can be added to a menu item whose ContextType is "browser_action" or "page_action". Any items beyond this limit will be ignored.

Its value is 6 on Firefox and Chrome.

For compatibility with other browsers, Firefox makes this property available via the contextMenus namespace as well as the menus namespace.

Browser compatibility

BCD tables only load in the browser

Note: This API is based on Chromium's chrome.contextMenus API. This documentation is derived from context_menus.json in the Chromium code.