A demo of the menus API.

This add-on injects JavaScript into web pages. The addons.mozilla.org domain disallows this operation, so this add-on will not work properly when it's run on pages in the addons.mozilla.org domain.

This add-on uses the menus namespace to access the functions it needs to create menu items. Note that Chrome, Edge, and Opera all use the contextMenus namespace for this, so this extension will not work in these browsers. For compatibility with these browsers, Firefox also offers the contextMenus namespace, so to make this extension work with other browsers, use contextMenus.

This add-on adds several items to the browser's context menu:

• one shown when there is a selection in the page, that logs the selected text to the browser console when clicked.
• one shown in all contexts, that is removed when clicked.
• two "radio" items that are shown in all contexts. These items are grouped using a separator item on each side. One radio item adds a blue border to the page, the other adds a green border. Note that these buttons only work on normal web pages, not special pages like about:debugging.
• one "checkbox" item, shown in all contexts, whose title is updated when the item is clicked.
• one item that uses the "commands" property to open the add-on's sidebar.

It also adds one item to the browser's "Tools" menu.

• How to create various types of menu item:
  • normal
  • radio
  • separator
  • checkbox
• How to use contexts to control when an item appears.
• How to update an item's properties.
• How to remove an item.