Mozilla Firefox 4 Release Candidate is now available for download and testing.Firefox 4 RC is based on the Gecko 2.0 Web platform.This Firefox 4 RC is considered to be stable and safe to use for daily web browsing, though the features and content may change before the final product release.
What’s new in Mozilla Firefox 4 Release Candidate? Some new features are
1.General stability, performance, and compatibility improvements
2.Firefox 4 RC is available in 79 languages
3.70% of Firefox plugins are compatible with Firefox 4