Created attachment 454569 [details] WinDbg hang log Was watching the weekly Monday meeting. Had the browser fullscreen (f11), zoomed ctrl + +, watched the meeting, reset zoom (ctrl + 0), exited fullscreen, started watching a flash video, tried to close the window with the Monday meeting. I attached WinDbg to the running process. Hopefully useful info was caught.
doesn't look like it, sorry. for mozilla it's usually best to use the 32bit version of windbg on 64bit systems.
OK, going to close as incomplete as i doubt this is trivial to reproduce.