Windows/Mac/Linux: Mozilla just pushed out the first release candidate for the upcoming Firefox 3.6. Early adopters, start your downloads.
Firefox 3.6 has been a much-delayed release, but the release candidate means that the final release is just around the corner. The Firefox 3.6 release comes packed with Personas built-in (the no-restart theming functionality), better tools to keep plug-ins up to date, improved performance, and improvements for HTML5. (Speaking of, here's HTML5 will change the way you use the web.)
Firefox 3.6 RC1 is a free download for early adopters, works on Windows, Mac OS X and Linux.
Firefox 3.6 RC 1 [Mozilla]