Not firefox/seamonkey (and presumably others)

"This is controversial, however, it is just a different philosophy. The user runs as administrator (root), apps may optionally run as a non-root user or in containers as a "crippled root". The practical outcome is that you never have to type "sudo" or "su" to run anything, nor get hung up with file permissions. Note, current releases of Easy default to running Firefox as user 'firefox', and SeaMonkey as user 'seamonkey'. It is easy to do the same for any app, that is, run it as its own user, isolated from other users."