Since upgrading to 3.5 I have noticed something. Initially I just thought it was me, but having upgraded at work now, I notice it on that machine as well.
Occasionally when I click the firefox icon to start firefox, nothing happens. it doesn't start. A check of the rrocesses running shows it isn't running. This morning I decided to post about this cause it took a third click of the icon to get firefox to umm..fire up!
Wondering if anyone else has this happen, I originally thought it was a quirk of my machine, but yesterday it did it at work as well.