Small Firefox LogoDespite reports that it will not be available until Friday, sites like ReadWriteWeb and Erictric are jumping the gun and reporting that Firefox 3.6 RC1 builds have been made available for download.  However, as pointed out by a commenter at ReadWriteWeb, the downloads, which are offered for Windows, Mac and Linux, are actually for the first candidate of a RC1 build:

No it’s not available yet. What you are seeing is the first candidate build of RC1…very very close but not quite there. It doesn’t help Mozilla either to point to direct FTP links instead of the mirrored links (HTTP) that will be published when it is finally released.

You are of course free to install the candidate builds if you’d like, but you won’t be using the actual RC1 build unless things go very smoothly with the build and there isn’t a need for another candidate.  That being said, as I pointed out to start this post, the actual RC1 build is expected to be announced on Friday, so you won’t have to wait very long to get the real deal either way.