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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

V.3.6.3 telah di releasekan pada 1 April 2010

Apa yang Baru di firefox 3.6.3
Firefox 3.6.3 perbaikan masalah keselamatan penting yang berpotensi dapat membolehkan
eksekusi kod jauh. (lihat bug 555109)
Anda juga mungkin tertarik dalam catatan keluaran Firefox3.6.2 untuk daftar perubahan pada versi sebelumnya.