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Firefox's about:memory option makes it easy to see what's going with your memory
In fact, Firefox can get take you quite deep into what's happening with its memory. Now, if only it would just automatically do a better job of managing memory...
I've seen far too many crashes on Firefox 6. This has ranged from Firefox friendly sites that were confused by Firefox "6" to extensions that simply wouldn't work to, as in this shot, an Adobe Flash player crash that only happens to me with Firefox 6.