Moving at the Speed of the Web
Some time ago I did a small review of the changes in the Firefox 4 beta. If you go to download Firefox right now you will be downloading Firefox 13. I’m sure you have noted that the releases of Firefox and other browsers have been increasing. You can go a step farther and download pre-released versions of most browsers. For Firefox you have Firefox Beta, Aurora, and Nightly, which at the time of this posting is version 16.