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.
Chrome Download Manager - Chrome Download Manager. Bring Google Chrome like Download shelf into Firefox.
Menu Filter - Keep your menus in check by filtering out items you never use.
Extended Statusbar - A much more detailed overview of your browser activity
Status-4-Evar - That status bar was removed in Firefox 4.0.