Really, memory _leaks_ are the issue. I have created a web application that needs to poll the server every few seconds. I've done everything I can to prevent me

Really, memory _leaks_ are the issue. I have created a web application that needs to poll the server every few seconds. I've done everything I can to prevent memory leaks, even using a pool of reused DOM objects. I ran it for about 15 hours. At the end, Firefox 3.6 was using only 42 MB of memory while IE 8 was using over 650 MB.