Notice: As a result of "Close Tabs to the Left" becoming standard functionality in Firefox version 88, this extension is now restricted to Firefox versions 87 and below. Usage: Right click a tab and select "Close Tabs to the Left". View the Source Code Note: Due to security limitations of the menus API, it is currently not possible to co-mingle extension menu items with built-in menu items. For this reason, the menu item is restricted to the bottom of the context menu (for now). Got a feature suggestion? Please add it to the issue tracker.