Do Not Track Plus for Firefox
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Full user review
"Works a treat, blocking trackers with ease"
Easy to set up, easy to use, configurable per site as needed.
None that I found so far.
I know that Google claims to have an "opt out" clause, but in this age of internet snooping and tracking, I didn't trust that clause. Funnily enough (looking at the DO NOT TRACK icon) it's blocking 4 things tracking me from this site!