Download Status Bar - Download Status Bar manages every aspect of your downloads (Launch, Show, Scan, Send To, Rename...
Download Manager (S3) - View and manage downloads from a tidy statusbar.
Menu Wizard - Customize menus : Helps removing, moving and renaming menus and menu items
Chrome Download Manager - Chrome Download Manager. Bring Google Chrome like Download shelf into Firefox.
Status-4-Evar - That status bar was removed in Firefox 4.0.
Extended Statusbar - A much more detailed overview of your browser activity