The exciting Firefox feature to be added in the release of Firefox 4: Beta 2 was App Tab support. The idea behind App Tabs is simple. You are able to keep a favicon only tab open and pinned to the browser at all times. Now yes, you can do this with the help of add-ons in Firefox 3, but I am excited to see this feature make its way into Firefox 4.
Here is a quick video to help you see why this is such an awesome innovation to the browser:
Firefox 4 is shaping up to be an exciting new browser. If you have been playing with the beta releases, let me know what you like or don’t like about it thus far in the comments.