I had left 8 tabs open overnight, and just now closed each one except for this gotwoot one.

The ram usage from firefox went from 277 -> 285 - > 240
One tab open (vbulletin forum, no less), and its still fluctuating between 240-245mb.
Closing tabs did practically nothing.

Then I force quit firefox, and reopen the gotwoot tab.
Ram usage is now at 70mb.

Doesn't this strike you as.......bad?
I don't really know how much more obvious I can make it...there's simply no other explanation for why this would happen other than firefox isn't managing its ram properly.