So you all propably already know about Firefox - in fact you're probably using it right now (and if you aren't, you should get it right now (hint hint)). It's been close to a year since they finished their first release, and since then, they've been hard at work making a new version, Firefox 1.5. If you want to test it, it's now available as Deer Park Alpha 2.
I've been using the Alpha for the past week, and here's what I've found:
First up, everything seems exactly the same. There isn't much that has changed from the public release of Firefox, in terms of the user interface. All of your buttons are in the same place as they would be on the normal release of Firefox. Most of my extensions worked straight away, with only one being disabled due to incompatability. But, after a closer look, I found some really cool new features.