[Brian]

looking over more of your crash reports, it looks like a pretty even split between WebCore crashes and cookie-related stuff. Troy's the OW expert, so I'll defer to him, but he probably wants to look at the following tickets:
272896, 274773, and 276106

If you are still getting crashes in 5.7 final, can you send in those crash reports? Everything I can find in the system is beta 2 or earlier.