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Neither SafeHistory 0.8 nor 0.9 (http://crypto.stanford.edu/SafeHistory/stanford-safehistory-0.9.xpi) are working for me with FF 3.6.13 after making the maxversion trick in install.rdf to allow install. Both are making the browser to cease adding items to history list, or at least not showing.
Update is needed for FF3.6.x and upper 3.x versions!
(4.x and upper versions doesn't need SafeHistory feature).
Also it has the same flaw in Options->Privacy for FF versions >2.X. It's the same problem I found for SafeCache, and you can find the fix here: https://addons.mozilla.org/en-us/firefox/addon/safecache/reviews/user:5280876 in case you still want to try.