I think thats what happened then, because it wouldn't even launch, it would constantly crash, all other apps were fine. I restarted, and dragged a backup from last week into that folder.
I notice safari tends to crash on certain flash sites, especially if you leave one in a tab.
Also: There were no bookmarks after it crashed 3 or 4 times, just a empty menu, then it crashed, opened it again, all new default. But the original prefs and settings were still there.