http://lifehacker.com/5284241/firefox-35-preview-available-with-an-update-checkYou can't grab it directly, but Mozilla is releasing a "Preview" of its long-awaited Firefox 3.5 release.
Download Firefox 3.5 Beta 4 and hit the Help->Check for Updates menu, and you'll move up to the "Preview" release—not quite a Release Candidate, but somewhere up from betas. As for the Preview itself, it contains stability and JavaScript fixes, better support for Ogg-coded audio and video, and a few other efficiencies.
The Release Candidate, meanwhile, is still slated for tomorrow, so this looks to be something like an almost-there nightly build.
Since I had beta 4 already, I just installed "Preview".
