Even the most casual Web developer needs an FTP application, but many of these are cumbersome and unintuitive--and they require installing yet another full-blown application. FireFTP turns Firefox into an impromptu and speedy two-way FTP application. Once installed, FireFTP appears in the Tools menu. Click it and a new FTP tab opens up, offering a simple two-pane system that lets you easily copy files between your desktop and your remote site.
Note: Once you've downloaded this zipped archive, you'll need to uncompress it and open the .xpi file in Firefox to install the plug-in. Launch Firefox and select File, Open File, then navigate to the downloaded file and click Open. Click Install Now to install FireFTP. It's well worth the minor hassle.
--Chris Null and Kim Saccio-Kent