I created a simple unprivileged user on my Ubuntu system which will be used to run my network applications (Firefox, etc..) from a limited user.
My purpose is to lower the possible damage that can be caused to my data in case of a malicious site trying to exploit a vulnerability in one of these network applications.
Is there a simple way to check that this limited user really limited as I expect it to be?
For example, I ran
find / -perm -o=w to see if there are important files that this user has permission to change.