Jamie, thanks a lot for your help. The change fixes the acroread problem.
The second problem of not being able to open Containing Folder is still present. As soon as I disable apparmor profile, I can open the Containing Folder even without re-starting Firefox, so it is definitely caused by apparmor.
Jamie, thanks a lot for your help. The change fixes the acroread problem.
The second problem of not being able to open Containing Folder is still present. As soon as I disable apparmor profile, I can open the Containing Folder even without re-starting Firefox, so it is definitely caused by apparmor.