If you are concerned about privacy, then ghostery still isn't ideal, as it still seems to collect data on the user and has an 'opt-in' ad service which will put adds in.

As others have recommended, for android other browsers are better. As for extensions, there are better ones as well (privacy badger + ublock origins will do what it does, but better).

It is the most comprehensive such study ever conducted: more than 144 million page loads were examined during the analysis. The research covered more than 12 countries, including the United States, Canada, Great Britain, France, Germany, Austria and Switzerland.

The study found that at least one tracker was prowling around 77.4 percent of the tested page loads. With the help of cookie or fingerprinting processes, these trackers tag along as users surf the Web, carefully recording their every move. In the most benign cases, this information is used only for statistical and advertising purposes. As a rule, a number of third-party tracking scripts hang out on popular websites, and they hitch a ride with users as they pass through domains. Ten or more trackers that amass personal data were found on 21.3 percent of the sites(unique domains) analyzed in the study.

[...]

The study also identified the most widely used trackers online. Google and Facebook stood out in particular, here. Google ranks in the top ten of the most widely used trackers based on page loads with five services. Facebook has three. Google Analytics was found on nearly half of all loaded pages (46.4 percent). Facebook Connect was on more than a fifth (21.9 percent).

Cliqz ne rachète pas la totalité de Ghostery, mais simplement son extension et les actifs associés. Le reste des activités sera poursuivi sous le nom original de l’entreprise, Evidon. La vente résout un conflit d’intérêt pour cette dernière qui, d’un côté, fournissait le plug-in anti-tracking, et de l’autre, vendait aux entreprises des données sur les outils de tracking bloqués par les utilisateurs.

Millions of people use the tool Ghostery to block online tracking technology—some may not realize that it feeds data to the ad industry.