Opera Files Antitrust Complaint in Brazil Over Microsoft Edge’s Default Status and Barriers to Competition

Opera, a Norwegian browser developer and Brazil’s third-most popular PC browser, has filed an antitrust complaint against Microsoft with Brazilian regulator CADE. Opera alleges that Microsoft gives its Edge browser an unfair advantage by pre-installing it as the default on all Windows devices and preventing rival browsers from competing on fair terms. The complaint accuses Microsoft of locking other browsers like Opera out of crucial preinstallation deals with hardware makers and of making it difficult for users to download and switch to alternative browsers. Opera says Microsoft uses intrusive banners, notifications, and so-called ‘dark patterns’ that deter consumers from switching browsers, and even manipulates system settings so that some links, files, and in-app features open only in Edge regardless of user preference. Opera’s general counsel, Aaron McParlan, argues these tactics systematically frustrate real choice and stifle competition. The company is seeking remedies that would allow PC manufacturers to pre-install competing browsers, prevent exclusive Edge deals, and ban deceptive interfaces that steer users toward Edge. This action, focused on the Brazilian market where Opera enjoys a strong user base, is part of Opera’s global campaign to challenge Microsoft’s practices. The case may have broader implications for how dominant tech platforms treat software rivals and manage consumer choice.