FireFTP is an interesting extension for Firefox which allows you to upload files from the interface of your web browser.
It is really easy to use and allows you to use several accounts. It doesn’t include lots of option, but that doesn’t mean it is not useful.
It includes a log option where you can see the activity of the program.
It also includes a Diff folder, and a sync application, so you have all you need for your daily updates of your websites.