Vivaldi and others line up behind Opera to request a rethink The European Commission's decision not to designate Microsoft Edge as a core platform service is eliciting anger from rival browser makers and engineers.

The European Commission declined to designate Microsoft Edge a gatekeeper under the EU Digital Markets Act (DMA). That was a mistake.

Microsoft gives its Edge web browser an unfair advantage and EU antitrust regulators should subject it to tough EU tech rules, three rival browsers and a group of web developers said in a letter to the European Commission.

Microsoft Edge does not have a big share in the market but its rivals feel that it should be part of the EU tech rules.

Rival browsers, along with web developers, urge the EU to impose stricter regulations on Microsoft Edge browser, alleging unfair market practices.

Web browser developers Vivaldi, Waterfox, Wavebox, and the Open Web Advocacy group have called on the European Union to take action against Microsoft for allegedly promoting its Edge browser unfairly on Windows.