fireFTP is a tiny extension to Firefox that provides full fledged FTP capabilities. Being an extension to Firefox, it works cross platform. It’s very small (less than 60kb) and opens up neatly in a new tab in FireFox. It supports passive mode, can remember connection details, resume downloads, automatically set transfer modes and even work over a socks proxy.
I used Filezilla for FTP earlier and got hooked to fireFTP after using it once. If you don’t use Firefox yet, fireFTP is a great reason to switch 😉