How do we update? Rated 5 out of 5 stars

I agree with Rob, this should be a Preference included with the browser. It's basic.

Unfortunately, this add-on hasn't been updated since TB 1.5. Fortunately, you can download a "bumped" version that will work up to TB 3.0 at:

http://forum.addonsmirror.net/index.php?s=dcde7e23d9f47a1236859008f3a6c7f5&showtopic=7228