Earlier quoted context omitted.
Yes, memory has become better, but only marginally. That's why I use the "restartless restart" extension. And if you use Firebug, you are screwed as well, only quicker. I never really liked Chrome, but it's so fast and snappy, and Firefox has still not catch up in that area.
I'm always surprised with peoples experience with Firefox memory usage of recent, it has been excellent for me. I can sometimes get upto 200+ tabs, while only sitting on 1.5GB of used memory. This is in Linux, but most of the memory-handling code shouldn't be that different between OSs in terms of GC algorithms. As for restartless extensions, I think mozilla should really push people to switch their extensions to use…
After restarting it (and loading all the tabs): 250mo.
It may well be problem with some extensions but I only use 9.
edit: if someone is lloking for the restart extension : https://addons.mozilla.org/en-US/firefox/addon/restartless-r...