Running Firefox oder ssh with X11 redirecting crashes since 51.0.1 or 51.0 when I close one of the opened windows. This happens with a new profile as well as in safe mode. Running locally don't causes those crashes. AbortMessage: ###!!! ABORT: RenderFreePicture: RenderBadPicture (invalid Picture parameter): file /build/firefox-RuETGa/firefox-51.0.1+build2/toolkit/xre/nsX11ErrorHandler.cpp, line 147 BTW: Using your Crash Reporter is not possible because it does not use the configured proxy but tries to connect directly.