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Downgrade Firefox to 16.0.2
You can download this package from Arch Rollback Machine.
See this: https://wiki.archlinux.org/index.php/Downgrade

I have solved this problem by disabling VSync in nvidia-settings and QL.

Same here (Arch Linux x86_64, NVidia and AMD graphic card).

journalctl shows:


kernel: plugin-containe[7340]: segfault at 18 ip 00007ff420169d42 sp 00007fffc169d4d0 error 6 in...