Firefox 36 nightly build 14/10/17 Win 7 x64 Flash 15.0.0.189 Open any site that loads the Flash plugin. For example: http://www.newgrounds.com/movies/browse/interval/month/sort/score makes heavy use of it. A windows app crash window pops up and Firefox reports that the plugin has crashed. I'm not sure since when this happens but it was also crashing in the 14/10/16 build.