I recently came across free ftp add-on for firefox, after having CuteFTP cras and freeze many, many times 10 minutes of research got me to the right place – FireFTP!
If you like enjoying free and reliable software we definetely recommend check out FireFTP. It can be downloaded at the following link: https://addons.mozilla.org/firefox/684/
FireFTP is a free, secure, cross-platform FTP client for Mozilla Firefox which provides easy and intuitive access to FTP servers.
Along with transferring your files quickly and efficiently, FireFTP also includes more advanced features such as: directory comparison, syncing directories while navigating, SSL encryption, file hashing, and much more!