Today's triage session concluded with all systems go for a Firefox 4 launch on March 22nd. We will continue to have triage sessions on a daily basis to watch for major issues; however, at this point, we've concluded RC1 will become Firefox 4 final.
Fantastic job by everyone involved in this release. Amazing work!
The date comes as no coincidence after the release of Internet Explorer 9 was announced 2 days ago. At the moment, you can download Firefox 4 as a release candidate for both Mac and Windows.