Show HN: Gemma Gem – AI model embedded in a browser – no API keys, no cloud (github.com) AI

Gemma Gem is a Chrome extension that runs Google’s Gemma 4 model entirely on-device in the browser using WebGPU. It avoids API keys or cloud calls and can use a simple agent loop to read page content, click and fill forms, run page JavaScript, and answer questions about the site you’re viewing.