Mar 4, 2011 18:25 GMT  ·  By

The first Release Candidate for Firefox 4.0 is just around the corners, and early adopters that “know their way around” a nightly build can grab a preview of the RC development milestone and start testing it. Firefox 4.0rc1-candidates are now available for download via the browser maker’s FTP servers, but as I said above, this is nothing more than a nightly Build, and certainly not the fully fledged RC.

This is why, early adopters that can bear to exercise their patience a tad longer should do so, because it won’t be long now until Mozilla will launch Firefox 4.0 RC.

“[On March 3, 2011] we ordered release candidate builds for Firefox 4, which have been duly produced and are now being validated by our QA team before we ship them to our beta audience,” revealed Mike Beltzner, Mozilla’s Director of Firefox

“Once the release candidate is in the hands of our more than 3 million daily beta users, we expect to spend another period of time doing intense QA validation before ship.

“The release candidate represents the code we *intend to ship* as Firefox 4 - it is not yet validated and supported, but if all goes well, those are the bits we intend to "put on the wire."

At this point in time, Mozilla is simply fine-tuning Firefox 4.0 and focusing on resolving just a few remaining hard blockers (severe issues), after which, the browser will be ready for release.

Along with the preview Build of Firefox 4.0 RC1, Mozilla also releases Firefox 3.6.15.

Softpedia readers must already know that Firefox 3.6.14 and Firefox 3.5.17 were launched in tandem at the start of this month.

With Mozilla now also offering Firefox 3.6.15 this soon after v.3.6.14 it means that the company identified some issues with the previous update which it needed to address immediately.

Firefox 3.6.15 and Firefox 3.5.17 for Windows are available for download here. Firefox 4.0 Beta 12 for Windows is available for download here.

Firefox 4.0 Beta 12 for Linux is available for download here.

Firefox 4.0 Beta 12 for Mac is available for download here.