20 great Firefox extensions By Jason Meserve

#14 FireFTPWhat it is: A cross-platform FTP client for Mozilla Firefox. Includes drag-and-drop file support, SSL encryption and remote editing.
Why you should use it: Extension includes more advanced features like directory comparison, syncing directories while navigating, SSL encryption, search/filtering, integrity checks, remote editing, drag-and-drop, file hashing -- to name a few.
Where to get it: Click here.