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tabs crash in Sandboxed Tor Browser with Tor Browser 7.5.a5

After being updated to 7.5a5 tabs in Sandboxed Tor Browser (0.0.14-dev (35d5080)) keep crashing.

Reproduce: • update to Tor Browser 7.5a5 • open new tab • enter any address • tab crashes

debug output:

2017/09/29 02:01:22 sandbox: X11: New connection: 5                                                                                                                                                                                                                            
2017/09/29 02:01:22 sandbox: X11(5): Protocol 11.0
2017/09/29 02:01:22 sandbox: X11(5): Auth: 18 | 2 | 16 | 0
2017/09/29 02:01:22 sandbox: X11(5): Req(#00001): QueryExtension: 'BIG-REQUESTS'
2017/09/29 02:01:22 sandbox: X11(5): Req(#00005): QueryExtension: 'XKEYBOARD'
2017/09/29 02:01:22 sandbox: X11(5): Req(#00041): QueryExtension: 'RANDR'
2017/09/29 02:01:22 sandbox: X11(5): Req(#00042): QueryExtension: 'Generic Event Extension'
2017/09/29 02:01:22 sandbox: X11(5): Req(#00073): QueryExtension: 'XFIXES'
2017/09/29 02:01:22 sandbox: X11(5): Req(#00075): QueryExtension: 'Composite'
2017/09/29 02:01:22 sandbox: X11(5): Req(#00077): QueryExtension: 'DAMAGE'
2017/09/29 02:01:22 sandbox: X11(5): Req(#00079): QueryExtension: 'SHAPE'
2017/09/29 02:01:22 sandbox: X11(5): Req(#00091): QueryExtension: 'SYNC'
2017/09/29 02:01:22 sandbox: X11(5): Req(#00093): QueryExtension: 'SYNC'
2017/09/29 02:01:22 sandbox: X11(5): Req(#00094): QueryExtension: 'MIT-SHM'
2017/09/29 02:01:22 sandbox: X11(5): Scheduling QueryExtension for rejection: 'MIT-SHM'
2017/09/29 02:01:22 sandbox: X11(5): Rep(#00094): Rewriting reply: QueryExtension rejection: MIT-SHM
2017/09/29 02:01:22 sandbox: X11(5): Req(#00095): QueryExtension: 'XInputExtension'
2017/09/29 02:01:22 sandbox: X11(5): Req(#00096): QueryExtension: 'XInputExtension'
2017/09/29 02:01:22 sandbox: X11(5): Req(#00098): QueryExtension: 'XInputExtension'
2017/09/29 02:01:22 sandbox: X11: New connection: 6
2017/09/29 02:01:22 sandbox: X11(6): Protocol 11.0
2017/09/29 02:01:22 sandbox: X11(6): Auth: 18 | 2 | 16 | 0
2017/09/29 02:01:22 sandbox: X11(6): Req(#00001): QueryExtension: 'BIG-REQUESTS'
2017/09/29 02:01:22 sandbox: X11(6): Req(#00005): QueryExtension: 'XKEYBOARD'
2017/09/29 02:01:22 firefox: Sandbox: prctl(PR_SET_NO_NEW_PRIVS) failed: Function not implemented
2017/09/29 02:01:22 firefox: [Parent 3] WARNING: pipe error (64): Connection reset by peer: file /var/tmp/build/firefox-0a9793458e9d/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 322
2017/09/29 02:01:22 firefox: [Parent 3] WARNING: pipe error (66): Connection reset by peer: file /var/tmp/build/firefox-0a9793458e9d/ipc/chromium/src/chrome/common/ipc_channel_posix.cc, line 322
2017/09/29 02:01:22 firefox: ###!!! [Parent][MessageChannel] Error: (msgtype=0x2C0086,name=PBrowser::Msg_Destroy) Channel error: cannot send/recv

Trac:
Username: pege

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