Rated 5 out of 5 stars

Works with Firefox 6.0.1 well, doesn't interfere with add-on bar's open/closed state during sessions, just edit install.rdf and make the proper modifications to be able to install this. As to what Battlemaster said, there's no need for QuickProxy, as ProxyBar has its own quick activate/deactivate button and it sets up the same proxy for all fields, including socks. Even so, Flash won't adhere to the settings of the browser in which case you should use a system-wide proxifier like ProxyCap when using Socks servers.