Rated 5 out of 5 stars

Do not use Ghostery. Ghostery sold out to an advertising company, Better Advertising, in January.

It's ironic that an addon the main purpose of which is to thwart advertising and tracking is now owned by an advertising company.

This review is for a previous version of the add-on (1.0.1). 

Didn't Know That

Thanks for pointing that out, I had missed the switch over. I've added a comment to the description relating this information.