Mozilla Firefox 4 for Windows, Mac and Linux has exited the beta cycle and is now available as a release candidate in more than 70 languages. Users testing Firefox 4 will be automatically updated to this version and will join Mozilla's QA team in validating the new features, performance and stability and HTML5 capabilities in Firefox 4.

Mozilla encourages testers to check out the Web O' Wonder web site in order to see the future of the Web with online demos.

Mozilla claims that more than 70 percent of Firefox Add-ons are now compatible with Firefox 4, while more than 8,000 bugs have been fixed since the first beta release of Firefox 4.

You can download Firefox 4 RC here.