- Option to disable sending referrer information to other domains.
This should be compatible with in-domain content protection schemes that use referrers, while preventing cross-site tracking of the user.
Could be implemented as a boolean preference 'network.http.sendRefererHeader3rd'.
Example: You click on a link on Google. Normally, the site you go to sees that you came from Google, but with this option enabled, it will not know where you came from. However, while you browse through that site, it will be able to track your movements. When you leave that site for some other site, the new site will not now where you came from, and the old site will not know where you went.
Thoughts: Could be construed as a little rude, because referrer information helps site operators target their marketing better. Still, it would be a useful option for those that value their privacy higher.