At least one respected member of our community thinks that setting Fit width to view causes a lot of similar problems. It's under the View menu; you might try unchecking it.

I don't have any crashing problems with my browser under Diablo, whether I set Fit width to view or not. I do have the Flashblock program installed. It blocks flash and presents an icon instead, so if you want to run Flash, you just click the icon. It works well for me, though some sites just report that you don't have Flash installed. And of course I have the virtual memory turned on -- I think that's something that "virtually" everyone should do.