Gmail crash on Firefox

In case you've been bugged with frequent gmail crashes on fx (9 out of 10 times for me), you can safely assume it to be some extension not gelling well with the big G; or at least that was the case for me. Finding out the real culprit was a bit tricky though: I disabled AdBlock+ on gmail, uninstalled YSlow and Firebug without any luck, in the end, the less pesky HTML Validator turned out to be the problem, disabling HTML Validator for gmail has fixed it for now.