At home I run Mac OS X and run one Mozilla Application : Thunderbird, with one extension enigmail. I also run Camino of course which is based on the mozilla codebase. At work I usually can't use Thunderbird as I'm connecting to exchange or domino servers, and it would not make sense to use Thunderbird yet. Some time ago dbaron posted instructions and a perl script. He released theses tools in order to track down memory leaks in the mozilla codebase. I've started an effort to find leaks with these tools in Camino, I assume some people will hunt leaks in Firefox, but Thunderbird - would it make sense to hunt such leaks ? I've never found Thunderbird sluggish, or memory eating, but I suppose some leaks in the codebase could also be found using those tools.