I've been using the stock browser rather heavily on multiple ROMs for about 6 weeks now, and I would say that it is just plain buggy - there's very little you can do about it. I've crashed it within minutes of using it for the first time on a new ROM, so it's unlikely that a FR or cache clearing will change things.
I don't know if there is something I could change about my behavior so that I would see the problem less often, but I frequently do things like re-size pages or click on links in pages as they are still being loaded, or even change from landscape to portrait and back and forth while doing text entry. (The phone keypad in portrait has far more bugs than the landscape text entry mode, but they both have problems.)
I've also had it crash many times when submitting posts - generally after the post has "taken" on the forum site (phew!), but the thread page refresh is just starting to occur.
I wish it was less buggy. OTOH, it's 100,000x better than what my old dumb phone could do.
eu1