Firefox 4.0 Beta 2 is available for download.
If you want to test it without interfering with your current Firefox installation or user profile, you can do it easily with my extension FoxTester. Make sure you get the latest 1.0.5 version from here or here, since this version is already compatible with Firefox 4.0b3pre.
If you like to do install it manually, then see Method #1 of the Installing Other Versions tutorial.
If you are planning to make it your default browser, then be aware that most extensions won't work yet and you should not override compatibility check, otherwise they could cause all sorts of problems, due to the extensive changes in Firefox extension API.
Don't forget that this version has a Feedback extension, that allow you to report what you like and don't like about Firefox 4. You can also see what others users are saying about it, along with some statistics.
More info about this release at http://blog.mozilla.com/blog/2010/07...-23-languages/
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