[apparmor] [Merge] ~u-d/apparmor-profiles:thunderbird/launcher into apparmor-profiles:master

[intrigeri]

Updates on this front: https://bugs.debian.org/874100 and https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=855346#60.
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https://code.launchpad.net/~u-d/apparmor-profiles/+git/apparmor-profiles/+merge/320276
Your team AppArmor Developers is requested to review the proposed merge of ~u-d/apparmor-profiles:thunderbird/launcher into apparmor-profiles:master.