zexen_lowe on 23 March 2011
Fiddling with it a bit more, I think it's easily the best browser I've ever tried and a massive improvement to the already excellent FF3, it's definitely faster and more stable, and tab pinning and tab groups are something I definitely see myself using soon. And the new add-on manager is simply awesome and very easy to navigate (unlike the older one)
I think this review details pretty well all the changes, it's a good read since it showed me all the new things FF4 can do and that aren't that evident immediately
http://arstechnica.com/open-source/reviews/2011/03/ars-reviews-firefox-4.ars
