Review for Environment Proxy by facildelembrar
Rated 5 out of 5 stars
You don't need to install any extension to setup a proxy. On thunderbird 2, you can click on tools, options, advanced, general tab, then click on the config button. Then you change the settings you need. There are more instructions on which settings to change on this page (http://kb.mozillazine.org/RSS_proxy_(Thunderbird))
To create your own collections, you must have a Mozilla Add-ons account.