I installed some Mac OS X updates today, and after they finished I was asked to restart my computer... so being the faithful computer user I am, I did. When I brought FireFox back up after rebooting, an advertisement for Registry Cleaner popped up warning me that my registry needs to be cleaned. Now, I have FireFox set up to remember the sites I was visiting when it is closed, but I don't recall seeing this before rebooting... also, the two pages I was viewing did not come back.Maybe I'm wrong, but I don't think there's a registry in Mac OS to clean... where did this ad come from?