Should be Default Rated 5 out of 5 stars
It works great and does it's job. The frequent updates are a good thing. Who cares about 5 seconds if it makes your browsing that much better.
The only somewhat annoying this is if you re-install firefox and have to re-allow a large number of websites. It'd be nice if there was some way to backup the settings to a server however that's just my nitpicking.