Welcome to Linux, @Krusty My opinion is: Use only the AppArmor profiles which are enabled by default - and the Firefox profile doesn't belong to them. I recommend to rather sandbox, e.g., Firefox and Chrome by using Firejail. It provides a very tough sandbox and is considerably less troublesome than AppArmor - particularly for newbies. Besides, using AppArmor and Firejail alongside for the same applications can be difficult at times. Install Firejail from the repositiories and execute the two commands shown here. The second command takes care that all installed applications for which profiles are available will be sandboxed by Firejail . You can find more information on the Firejail homepage, particularly here. If you have any questions you can ask in the Firejail thread in this forum.