Hello Xav, thanks for the bug report.

Can you try adding some AppArmor rules to the firefox profile? I suspect
this may require a few iterations to find all the issues:

ptrace (trace) peer=@{profile_name},
@{HOME}/.mozilla/firefox/*/gmp-widevinecdm/*/lib*so m,

You can add these lines to the 'main body' of
/etc/apparmor.d/usr.bin.firefox and reload the profile with
apparmor_parser --replace /etc/apparmor.d/usr.bin.firefox

Then try again and see what else is broken.

Thanks

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https://bugs.launchpad.net/bugs/1777070

Title:
  firefox plugin libwidevinecdm.so crashes due to apparmor denial

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