Firefox 4 Beta is based on the Gecko 2.0 Web platform. Please read below for more detailed information about what's new in this version of the beta release, as well as the known issues.

This Firefox 4 Beta 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. At this time many Add-ons may not yet have been tested by their authors to ensure that they are compatible with this release. If you wish to help test Add-on compatibility, please install the Add-on Compatibility Reporter - your favorite Add-on author will appreciate it!

Check out what’s new, the known issues and frequently asked questions about the latest version of Firefox. Please tell us what you think using the feedback tools provided as part of the beta. We appreciate your input!