Beta 1 is now available! Surprisingly, it's really smooth. Switching tabs doesn't cause it to choke at all, which isn't something I can say about Chrome. Instead of the normal 400-500MB of memory 3.6 used to use, it seems like this beta only uses about 250MB now, and that's also with extensions. I bet it'll rise up to 350MB soon enough, but that's still not as high as 500MB (I have 3 applications that use that much that I keep running all the time - yay for having 4GB of RAM). Okay, I was being too hopeful. 3 hours later, it's back up at 450MB with about 40 tabs open. Tabs on top is pretty nice, and if people don't like it, it can be easily switched back to the old method. Sure, people can say it's copying Opera and Chrome, but those browsers don't offer the customization ability that Firefox does. While most addons are disabled due to compatibility by default, you can use this extension to re-enable them. Greasemonkey currently doesn't work, and Stylish seems to work, but it's missing it's menu. Everything else that I use seems to work. One bug, though: Personas + hidden menu bar (so you have the orange Firefox button instead) = missing min/max/close buttons. Probably will be fixed by Beta 2, I imagine. 2 awesome features: - Loading icon on the tab button that shows progress, instead of just a spinning icon - If you type the name of a website in the location bar which is already open in a different tab, you'll get the option to switch to that tab. Something I'm sure I'll find useful since I tend to have a million tabs open and it'll help me realise "oh! I already have that tab open"