Well many people have been complaining about memory leaks with mozilla firefox
Byt developers argue it really isnt a bug its just another feature from firefox. According to reports Memory leak is how firefox manages cache in different tabs.
“To improve performance when navigating (studies show that 39% of all page navigations are renavigations to pages visited < 10 pages ago, usually using the back button), Firefox 1.5 implements a Back-Forward cache that retains the rendered document for the last few session history entries. This can be a lot of data. It's a trade-off. What you get out of it is faster performance as you navigate the web.
For those who remain concerned, here's how the feature works. Firefox has a preference browser.sessionhistory.max_total_viewers which by default is set to -1. When set to this value, Firefox calculates the amount of me"
The code for memory leak firefox is here check out ;)
