"If you like your browser interface to be simple, try these extensions designed to unclutter Firefox. Compact Menu 2 and two alternative extensions collapses all the menus into a single drop-down button, creating room for you to add buttons such as Downloads, History, and Bookmarks to the menu bar. Organize Status Bar lets you rearrange all the items displayed on your status bar, or even hide some.
Extension logoExtension series
"To install the Compact Menu 2 extension, click the Install Now button on its home page..."
