Fix for Mac Firefox insomnia

I found a workaround on Bugzilla for the problem with Firefox 3 on Mac where the Mac would not sleep after idle time if Firefox was running. You need to go into about:config and set “places.frecency.updateIdleTime” to 0. I tested this on FF 3.0.4 OS X 10.5.5 and it works. Hoo-frickin-ray! This was really annoying as I didn’t like leaving my Mac running all the time and like to leave Firefox open with like a zillion tabs open.