Tor Browser 7.5a1 (7.0.1 doesn't have this issue as far as I tested) Platform: Debian sid 64 bits. Steps to reproduce: 1. Open Tor Browser, 2. Ctrl+O 3. Select some PDF file and click open 4. Download box will show up, click on cancel 5. it should crash When debugging: ``` [Parent 3674] ###!!! ABORT: __delete__()d actor: file /home/debian/build/tor-browser/ipc/glue/ProtocolUtils.cpp, line 299 [Parent 3674] ###!!! ABORT: __delete__()d actor: file /home/debian/build/tor-browser/ipc/glue/ProtocolUtils.cpp, line 299 Crash Annotation GraphicsCriticalError: |[C0][GFX1-]: Receive IPC close with reason=AbnormalShutdown (t=8.69987) [GFX1-]: Receive IPC close with reason=AbnormalShutdown [Child 3795] WARNING: pipe error (3): Connection reset by peer: file /home/debian/build/tor-browser/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 322 [Child 3795] ###!!! ABORT: Aborting on channel error.: file /home/debian/build/tor-browser/ipc/glue/MessageChannel.cpp, line 2152 [Child 3795] ###!!! ABORT: Aborting on channel error.: file /home/debian/build/tor-browser/ipc/glue/MessageChannel.cpp, line 2152 [notice] Owning controller connection has closed -- exiting now. [notice] Catching signal TERM, exiting cleanly. ./Browser/start-tor-browser: line 369: 3674 Segmentation fault (core dumped) TOR_CONTROL_PASSWD=${TOR_CONTROL_PASSWD} ./firefox --class "Tor Browser" -profile TorBrowser/Data/Browser/profile.default "${@}" < /dev/null ```