hi, unfortunately this crash is triggered by your comodo security product hooking into firefox - they already had the same issue a couple of days ago after the last windows update: https://forums.comodo.com/news-announcements-feedback-cis/please-read-before-updating-to-microsoft-update-kb4022716os-build-15063447-t119928.0.html;msg861691#msg861691 - now it's apparently creeping back :-/

Thanks man, your reply was lightning fast. I'd be absolutely gutted if I had to choose Chrome over Firefox. Suffering from Chrome usage since this morning.