Comment 11 for bug 126012

I too have been plagued by this bug for months, but I think I have something (useful) to add.
It doesn't seem to matter how many tabs I have open, but if YahooMail is one of them, I experience the following:
Memory use gradually creeps (about 5MB/min) until it maxes out (2GB), then the swap starts growing. Once the available RAM approaches 0, the system becomes terribly unresponsive.

However, if I close YahooMail, there is no noticeable increase in memory use after leaving Firefox open overnight.

Firefox 3.0.12
Ubuntu 8.10

Hope that helps!