A report commissioned by Mozilla has accused Microsoft of deploying 'dark patterns' within Windows to nudge users away from rival browsers and towards its own Edge product. The study, which analysed user interfaces across multiple regions, found that Microsoft employs confusing pop-ups, misleading buttons, and hard-to-dismiss prompts that make switching browsers unnecessarily difficult.
The research highlights stark regional differences: users in the European Economic Area (EEA) encounter fewer and less aggressive tactics, likely due to the stricter enforcement of the EU's Digital Markets Act (DMA). Outside the EEA, including in the United Kingdom, the report found that Microsoft continues to use full-screen prompts, pre-selected defaults, and language that implies Edge is the 'recommended' or 'safer' choice — even when users have clearly opted for alternatives like Firefox or Chrome.
Dark patterns are design elements that trick or coerce users into making choices they did not intend. Common examples include confusing wording on dialogue boxes, hiding the option to decline, or making the 'accept' button more prominent than 'reject'. The UK's Information Commissioner's Office (ICO) has previously warned against such practices, issuing guidance in 2023 that banned 'harmful' design patterns under data protection law. However, enforcement remains patchy.
Dr. Elena Marchetti, a digital ethics researcher at the University of Cambridge, said: 'The regional disparity is telling. When regulators act, companies change their behaviour. The UK, post-Brexit, has chosen not to align fully with the EU's DMA, leaving consumers vulnerable. This is not just about browser choice — it sets a precedent for how tech giants can treat UK users.'
For UK businesses, the implications are twofold. First, firms relying on web-based tools may find their employees’ productivity hampered by default browser settings that are not optimised for their workflows. Second, the report adds weight to calls for the UK's Digital Markets, Competition and Consumers Act (DMCC), which received Royal Assent in 2024, to be enforced more aggressively. The act gives the Competition and Markets Authority (CMA) powers to designate firms with 'strategic market status' and impose conduct requirements, though no browser-related actions have been taken to date.
Microsoft has not yet responded to the report's findings. Mozilla, which funds Firefox development, said the study was intended to 'shine a light on practices that undermine user autonomy'. The report recommends that regulators in the UK and elsewhere treat browser choice as a fundamental aspect of digital rights, and that companies be required to offer clear, neutral choices during system setup.