Well, the first Firefox 3.6 beta didn't make it out quite as early as we thought, but it's available now. Just head over to the official beta page on Mozilla's Firefox site to get it—provided you care enough to install and use an unfinished web browser, of course.
This first beta is available for Windows, Mac OS X, and Linux in a plethora of languages, and it brings a handful of little enhancements over Firefox 3.5. Browsing feels a little quicker, for starters, and Windows 7 users will also discover that Aero Peek now shows you individual tabs, just like in Internet Explorer 8. On the flip side, quickly switching from another program to Firefox now involves an extra click, unless you hold down the control key.
Here's a more exhaustive rundown of the new beta's features, in Mozilla's words:
As always, you'll probably want to back up your user profile before using a beta Firefox release, and we wouldn't recommend installing it on any mission-critical systems. Hey, it's called beta for a reason.