Chrome Download Manager - Chrome Download Manager. Bring Google Chrome like Download shelf into Firefox.
Download Status Bar - Download Status Bar manages every aspect of your downloads (Launch, Show, Scan, Send To, Rename...
Status-4-Evar - That status bar was removed in Firefox 4.0.
Extended Statusbar - A much more detailed overview of your browser activity
JDownloader - JDownloader is a free downloading tool that enables you to download files from over a hundred hosting sites. The tool is compatible with Linux, Mac and Windows operating systems. Read more about JDownloader.
Menu Wizard - Customize menus : Helps removing, moving and renaming menus and menu items