Thanks for this contribution but I think it's not ready for the masses.
I think this FTP client needs an option to remember passwords, needs a Refresh option on the right click, and an option on the right click to choose where to download a file.
Also, I don't like the way it uploads.
For example, with SmartFTP, when I want to upload a folder which already exists on FTP it ask me (like FireFTP) if I want to Overwrite, Overwrite All, etc., and if I chose Overwrite, it will overwrite only the files, not the entire folder! FireFTP will overwrite the entire folder, and you may lose some date, like I just did.
Also, there is no Browse option on the right click.
Again, Thank you for this contribution, but if somebody needs a real FTP client, it should avoid FireFTP for now.
The Best! You could have the option to only activate it separately. Because sometimes I want to access the FTP through the browser and not through the extension. And it's hard to have to disable the extension, restart Firefox for this.