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→Gecko 1.9 / Firefox3 Milestones
| Beta 4 || March 10, 2008
| [http://www.mozilla.com/en-US/firefox/3.0b4/releasenotes/ Mozilla Firefox Beta 4 release notes]
|- valign="top"
| Beta 5 || April 2, 2008
| [http://www.mozilla.com/en-US/firefox/3.0b5/releasenotes/ Mozilla Firefox Beta 5 release notes]
|}
