Adds Popup context menu to the Bookmarks toolbar button and the Sidebar tile bar.
Menu includes Bookmarks, History, Downloads, Add-ons, and Error Console and if they exist Sidebar Bookmarks. Check the bookmarks's properties for 'Load this bookmark in sidebar'.
Popup context menu uses, left (normal) click to open in sidebar (except 'Organize Bookmarks'), middle (wheel) click to open in new tab, and right (context) click to open in a popup window.
Multilingual support using Firefox's own language package.