OK, so the final version of Firefox 1.5 isn't ready yet; indeed, there'll be an RC3 upon us shortly. Neowin, my source for the original story, has since corrected themselves. Patience, grasshoppa.

"Someone seems to have jumped the gun. Firefox 1.5 is not yet available. We will be releasing a Firefox 1.5 RC-3 sometime in the next few days with a final release expected later this month."