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Firefox crashes with libX11-1.7.3

With libX11-1.7.3 Firefox crashes with the following messages:

[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
firefox: /var/tmp/portage/x11-libs/libX11-1.7.3/work/libX11-1.7.3/src/xcb_io.c:269: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.
Exiting due to channel error.
Crash Annotation GraphicsCriticalError: |[C0][GFX1-]: Receive IPC close with reason=AbnormalShutdown (t=3.51337) Exiting due to channel error.
Exiting due to channel error.
Exiting due to channel error.
Exiting due to channel error.
Exiting due to channel error.
Crash Annotation GraphicsCriticalError: |[C0][GFX1-]: Receive IPC close with reason=AbnormalShutdown (t=12.1242) Exiting due to channel error.
Exiting due to channel error.
Aborted

Original downstream report: https://bugs.gentoo.org/832986

Reverting commit 93a050c3 (from !80 (merged)) resolves the issue.

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