what are you all talking about? I've been using 64-bit firefox 3.0 (debian's iceweasel) with 64-bit flash (ever since 64-bit flash became available), no nspluginwrapper, and I have no firefox stability troubles at all.

I restart FF every week or so to keep its memory usage down. I typically have 30-50 tabs open at a time. Is it because I use flashblock?