There’s been a great conversation on Reddit about Privacyfix. Check out this comment from Jason:
I am the lead developer on Privacyfix. You can Google our company, Privacychoice, and see our track record as well as how much work we have contributed to this industry (our data also powers Collusion). Anyhow, Privacyfix sends nothing from your browser to our server, we designed it specifically to avoid this. I actually send the favicons for all our rated sites in the initial load as base64…just so our addon doesn’t have to touch other websites to render the favicons, which could create a privacy issue and change your browser history (that is how deep we went). One of the cool things that we get to do at Privacychoice is build Free consumer tools. Privacyfix blocks over 1K trackers, disconnects FB and Google tracking (Like and + buttons) adds DNT to Chrome headers and probably the coolest feature, it guides you through shoring up your privacy settings on Facebook and Google. You can always audit the addon yourself: chrome://net-internals/#events or grab httpfox. Hope you find it useful.