Rated 5 out of 5 stars

Awesome. Allows a more generic User Agent to minimize tracking ability. Go to http://panopticlick.eff.org/index.php? to see how unique your browser is using various User Agent settings. The more unique your browser info is (higher "1 in xxx" number) = the more trackable, easier to identify a user's activity. And make the prefs.js tweak to retain user agent settings!