Researchers at Koi Security described a multi-stage operation called ShadyPanda . Over the course of seven years, attackers released seemingly useful extensions for Chrome and Edge, built up an audience with positive comments and reviews. They then released an update containing malicious code . Researchers estimate that the total number of installations reached a remarkable 4.3 million downloads . The scheme is simple and unpleasant: “legitimate” extensions accumulate ratings, reviews, and trust badges for years, only to receive an update that contains malware, extracts arbitrary JavaScript, and executes it with full access to the browser . The code is obfuscated and becomes