A fairly ordinary squeeze install with the regular squeeze iceweasel and flashplugin-nonfree was also experiencing intermittent crashes which seemed to be associated with closing pages (tabs or whole windows) with flash content (video or game type content).
It recently became a lot more reproducible (maybe every other close of a flash content crashed) and therefore annoying. I followed the instructions at http://mozilla.debian.net/ and upgraded to the backport of "release" iceweasel/squeeze-backports uptodate 9.0.1-1~bpo60+1 and have just closed 10 flash-containing pages on the run without a crash. Bit early to say completely fixed but certainly at least a significant improvement here. Tim -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org