Firefox: when you go to about:preferences you may see

Your browser is being managed by your organization

In about:policies you can then see activated policies.

How to disable those policies on Linux? I did not find a decent web resource; hence this quick post. According to Firefox docs, a certain policies.json defines them:

This file goes into a directory called distribution within the Firefox installation directory.

In my case, I found this file via

sudo find / -name "policies.json"

and then removed it:

sudo rm /etc/firefox/policies/policies.json

After that, about:policies showed

The Enterprise Policies service is inactive.