Gemma Gem Browser AI Skill by ara.so — Daily 2026 Skills collection. Gemma Gem is a Chrome extension that runs Google's Gemma 4 model entirely on-device via WebGPU. It injects a chat overlay into every page and exposes a tool-calling agent loop that can read pages, click elements, fill forms, execute JavaScript, and take screenshots — all without sending data to any server. Architecture Overview - Offscreen document ( ): Loads the ONNX model via , runs the agent loop, streams tokens. - Service worker ( ): Routes messages, handles and . - Content script ( ): Injects shadow DOM chat UI, execute…