One Extension Could Hijack AI Assistants Across Chrome, Comet, Edge, Opera Neon and Claude

One Extension Could Hijack AI Assistants Across Chrome, Comet, Edge, Opera Neon and Claude Swati KhandelwalSep 16, 2026Vulnerability / Browser Security Security researchers at Forever Security have shown that one ordinary browser extension could take control of the AI assistants built into five Chromium-based products: Gemini Live in Chrome, Perplexity Comet, Microsoft Edge, Opera Neon and the Claude in Chrome extension. Once the extension was installed, it could access each product's built-in AI with a single click. On Comet, Edge, Opera Neon, and Claude in Chrome, it could drive the AI agent to act on behalf of the attacker; on Chrome and Comet, it could read files from the user's computer, and on Chrome, it could also switch on the…