For the love of fuck.... the memory leak that most people seem to think plagues Firefox is in fact a caching feature and not a memory leak.
Firefox stores a cache of pages in memory. This can be turned of in about:config if it's that much of a problem for you, but will dramatically reduce the speed that you can click back and forwards through pages.
I judge a religion as being good or bad based on whether its adherents become better people as a result of practicing it. - Joe Mullally, computer salesman