I was able to reproduce the problem, but only using the flash plugin:
Jan 31 23:38:34 tigreraye kernel: [221147.141240] audit: type=1400
audit(1485902314.881:3406): apparmor="DENIED" operation="mknod"
profile="/usr/lib/firefox/firefox{,*[^s][^h]}"
name="/dev/shm/org.chromium.CvbXEt" pid=11592 comm="plugin-containe"
requested_mask="c" denied_mask="c" fsuid=1000 ouid=1000
Jan 31 23:38:34 tigreraye kernel: [221147.141263] audit: type=1400
audit(1485902314.881:3407): apparmor="DENIED" operation="mknod"
profile="/usr/lib/firefox/firefox{,*[^s][^h]}"
name="/dev/shm/org.chromium.5Am9iK" pid=11592 comm="plugin-containe"
requested_mask="c" denied_mask="c" fsuid=1000 ouid=1000
I also tried the java plugin, but it does not use /dev/shm (it fails,
but for another reason):
Jan 31 23:43:49 tigreraye kernel: [221461.300441] audit: type=1400
audit(1485902629.062:6116995): apparmor="DENIED" operation="exec"
profile="/usr/lib/firefox/firefox{,*[^s][^h]}"
name="/usr/lib/jvm/java-8-oracle/jre/bin/java" pid=11779 comm="plugin-containe"
requested_mask="x" denied_mask="x" fsuid=1000 ouid=0
Jan 31 23:43:49 tigreraye kernel: [221461.301683] audit: type=1400
audit(1485902629.062:6116996): apparmor="DENIED" operation="exec"
profile="/usr/lib/firefox/firefox{,*[^s][^h]}"
name="/usr/lib/jvm/java-8-oracle/jre/bin/java" pid=11780 comm="plugin-containe"
requested_mask="x" denied_mask="x" fsuid=1000 ouid=0
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https://bugs.launchpad.net/bugs/1495248
Title:
usr.bin.firefox blocks /dev/shm
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