Curious to test out Firefox's reported memory leak for yourself? There's a contest you can participate in today called Furious Firefox Tabs. It was started by Kevin at theory.isthereason. From his site:
Check out some of the entries (which are sure to pour in today as time passes) at Flickr.
If you keep opening tabs in Firefox — say, more than 10 or 15 — the browser starts to slow to a crawl. See how many tabs you can open, but participate at your own risk! Oh, and uh... be sure to save all of your work first.