Fix Thunderbird 58 graphics

Vincas Dargisrequested to merge
Talkless/apparmor-profiles:fix-thunderbird-58-graphics into master

Add file rule to access Chromium-related temporary files.

Fixes https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=887973

Tested on Debian Sid (thunderbird 1:58.0~b3-1 form experimental) with GNOME, KDE (physical machine with NVIDIA and Intel graphics) and XFCE desktops.

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