Call stack traces are not generic. They point to specific places. Those places are aggregated and counted. You're free to disbelieve that Apple is reporting their #1 source of crashes honestly, but you should take a look at the Top Crash link provided by ZeroGravitas. If you're not seeing the same pattern, you're not looking without bias.

http://crash-stats.mozilla.com/topcrasher/byurl/Firefox/3.6....