Comment 13 for bug 72812

It is difficult to reproduce, but it happens daily with me, and it's made me try other gecko browsers. It happens on all of them, Seamonkey, Firefox, Fasterfox and Flock, downloaded in tar.gz or installed through apt. I've almost not found any mention of it on the net, although it's happened for me for a long time (at least a year) and only on Linux. Doesn't happen in MacOSX or Windows at least..