BRUSSELS, BELGIUM - MAY 22: (----EDITORIAL USE ONLY MANDATORY CREDIT - "EUROPEAN PARLIAMENT / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Facebook co-founder, Chairman and CEO Mark Zuckerberg testifies to the European Parliament in Brussels, Belgium on May 22, 2018. (Photo by European Parliament / Handout/Anadolu Agency/Getty Images)

It’s not just activist groups complaining that Facebook’s browser add-on policies are hurting political ad transparency. Mozilla has sent a letter to the European Commission contending that Facebook’s approach is creating a “lack of transparency.

” The browser developer wants to launch a Firefox Election package for the EU’s upcoming parliamentary elections, but Facebook’s recent changes will prevent an add-on in that package from identifying ads and showing how they’re targeting users. Mozilla further noted that Facebook’s political ad archive toolkit is still private and limited to a “small number of privileged researchers.”

While Facebook did reveal plans to release a political ad transparency toolahead of the EU elections, Mozilla was concerned this would be the same as the ad archive site Facebook delivered to the US in 2018, complete with “simple keyword searches.” This wouldn’t live up to the EU’s Code of Practice on Disinformation, Mozilla argued, and would prevent more advanced research.

The company said it had talked to Facebook about its views, but that it was “unable to identify a path” toward useful political ad data disclosures. It hoped that the Commission would bring up the issue with Facebook — in other words, that it might pressure the social network into making changes.

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