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These are the release notes for the first version of the Firefox 4 Beta, 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.
We rely on your feedback to help shape our products, so we've bundled a Feedback Add-On with the Firefox 4 Beta that provides an easy to use Feedback button.
If you want to test Add-Ons with Firefox 4 Beta, you will need to install the Add-On Compatibility Reporter first.

source: Mozila