See --> http://forums.avg.com/ww-en/avg-forums?sec=thread&act=show&id=173969#post_173969

I am not an AVG user; I have tried their free product and uninstalled it soon after the initial installation. From reading on the internet, it appears that when there is a spike in memory usage, AVG "interprets" that as a memory leak, possibly caused by malware. AVG could be incorrect concerning that assumption. Maybe they are being a bit too conservative about memory usage; just my opinion.

The decision is yours to turn off the "advisor" or leave it on.

If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.

As far as I am concerned, FF 8 does increase its memory usage from its previous versions, please read this thread:

https://support.mozilla.com/en-US/questions/897007

I am still trying to find time to check my add-ons since I have so many to check. As soon as I find time to do so, I'll post an update in the bug report. I don't know how many add-ons do you have installed, maybe you can try the suggestion to see if one or more add-ons might be the culprit.

I forgot to mention that I did disable the AVG's Advisor since it won't do any good anyway until a solution is being found.