Do you know what changed between FF4 and FF10? Almost nothing! Really! From FF6 to FF10 it is nothing for sure. But they managed to break addon compability 7 times in between. So, from what I understood, we were going to have releases from often so that we could get more features more frequently. We got nothing! Or almost nothing. I jumped of from FF6 to Chrome and I lived happily ever after. By the way, 5% of the Internet users are stuck with the outdated FF3.6 today, without the HTML5 advances of FF4 and FF6, because of this new release process. It is as if we need another browser vendor holding the web back. Thank you Mozilla.