If you're feeling adventurous, you can now download the first Firefox 4 Beta Candidate Build from Mozilla's directory of nightly builds. Not much has changed from 3.7 Alpha -- new tabs design, consolidated menu button, thinner overall border-- but this nightly build is said to be a little more stable and smooth compared to 3.7, and is a notable milestone on the road to an official beta release. 32 and 64-bit versions of the build are available here (scroll to the bottom), including Windows, Mac, and Linux flavors. There are still some rendering issues with Windows Aero, and Direct 2D hardware acceleration is disabled by default. Latest testing by Mozilla devs indicates that the JS engine isn't as fast as they want it to be yet, so expect much more fine-tuning in the coming weeks. Still, it's worth the download if you want to get a feel for how Firefox will look in the future.
read our primer here.
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