Firefox 4 is the latest version of one of the most popular web browsers. Most people have chosen Firefox as a replacement for Internet Explorer in the early days of web browsing. I remember that's what it was like for me. After getting tired of crashes and hanging, I switched to Firefox. When I switched to the Mac, I found Chrome to be a better and faster browser. But now, Firefox 4 is making me want to switch again. Here are some of the improvements over past versions of Firefox.
Graphically, Firefox 4 boasts a redesigned interface with lots of tweaks. The most notable one is the Tab Panorama, which is a sort of Exposé for tabs. It allows you to group and easily access open tabs with a hotkey. The tabs have been relocated to the top of the screen to save space.
Those are some of the new features in Firefox 4. I recommend you give it a try. I will test it more thoroughly and it looks like I might be making the switch back soon.