FireFTP is a free, secure, cross-platform FTP/SFTP client for Mozilla Firefox which provides easy and intuitive access to FTP/SFTP servers.

Features:

It's free!

Cross-platform: Works on Windows, Mac OS X, Linux

Secure: SSL/TLS/SFTP support, same encryption used with online banking and shopping

Synchronization: Keep directories in sync while navigating

Directory Comparison: Compare directory content (compares subdirectories too!)

International: Available in over 20 languages

Character Set Support: UTF8 and just about any other character encoding supported

Automatic reconnect and resuming of tranfers

Search/Filtering

Integrity Checks of transfers (XMD5, XSHA1)

Export/Import accounts

Remote Editing

File Hashing: Generate hashes of files (MD5, various SHA's)

Drag & Drop

File Compression: Using MODE Z

Timestamp Synchronization

Proxy support

FXP support

Advanced properties (CHMOD, recursive CHMOD, thumbnails)

Tutorials and help files available for support

IPv6 support

Open Source!

Seamless integration with Mozilla Firefox