"Either you're a professional developer and you deal with the slightly older APIs/compilers to serve your users, or you're a hack."
Bingo:
Firefox 3.6, Windows XP SP3, 14 tabs open, two on flash pages: 1.2GB memory used
Opera 10.10, Windows XP SP3, 14 tabs open to the identical pages: 330GB memory used
I came to the conclusion some time ago that I was still using firefox because I was attached to the Netscape/Mozilla name, psychologically. Firefox really didn't do anything that a number of other browsers don't do at least as well, usually better, so I jumped ship and started using Opera. No crashes, no whacked out memory leaks carried over from MOSAIC for pete's sake, and flash works just fine.