A browser extension has turned malicious after five years, affecting 4.3 million users on Chrome and Edge. Security experts warn of potential risks from this widespread installation. Users are advised to check their extensions for safety.
The malicious browser extension has been installed by 4.3 million users on Google Chrome and Microsoft Edge browsers, according to a TechRadar report published on December 2, 2025. Initially benign, the extension became harmful after operating for five years, posing risks to user data and privacy.
The report highlights the importance of vigilance in browser add-ons, as such extensions can access sensitive browsing information. It provides guidance on how users can check for and remove suspicious extensions to mitigate threats.
This incident underscores ongoing challenges in browser security, where long-standing tools can evolve into vectors for malware. No specific details on the extension's name or exact impacts were detailed in the available information, but the scale of installations emphasizes the need for regular security audits.