However what bothers me about privacy add-ons is that each one that I install is giving permissions in my browser to another person. It would be better if there was a single add-on that was audited by someone trustworthy.
A single all-in-one add-on could also work on making each of its users fingerprint the same, which is something that can't happen when each person is using a different combination of privacy enhancements.
I've not yet tried it, but I think user.js might be helpful for this: http://kb.mozillazine.org/User.js_file
If you use Windows, you can use local group policy (if you're not part of a domain) and it's not too difficult to export/import for new machines.