Besides a re-spin on the Firefox 9 for Mac release there was one other
issue oddity with the Firefox 9.0 update. I had updated a test profile (which is why the below screenshot looks so weird) from Firefox 8.0 to 9.0 via Help > About Firefox. Upon update the welcome page was telling me Firefox was out of date and linked to the Firefox download page which was still serving Firefox 8.0.1. An hour or so later when Firefox 9.0 was pushed out to the main Mozilla site, going back to that page displayed the message that Firefox was current.