Rated 1 out of 5 stars

extremely useful, facebook insists on this behavior because its tracing back to facebook every visit to other sites in a visible way for the sites owners so they'll be notified about the importance of facebook in spreading the knowledge, yes it doesn't make it with respect for privacy and is useful ... however since the involvement of ratings in discovering the top searches via google, instead of mozilla ... i wont strip this add on presence in my collection :) therefore will get a small rating of one star instead of five :)