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Show HN: Gemma Gem – AI model embedded in a browser – no API keys, no cloud
Gemma Gem is a Chrome extension that loads Google's Gemma 4 (2B) through WebGPU in an offscreen document and gives it tools to interact with any webpage: read content, take screenshots, click elements, type text, scroll, and run JavaScript.<p>You get a small chat overlay on every page. Ask it about the page and it (usually) figures out which tools to call. It has a thinking mode that shows chain-of-thought reasoning as it works.<p>It's a 2B model in a browser. It works for simple page questions and running JavaScript, but multi-step tool chains are unreliable and it sometimes ignores its tools entirely. The agent loop has zero external dependencies and can be extracted as a standalone library if anyone wants to experiment with it.
Gemma Gem is a compelling technical proof-of-concept for local, privacy-focused browser agents using WebGPU, but it currently lacks a defensive moat and faces extreme platform risk from Google's native Gemini Nano integration. While the technical execution is impressive for an early-stage project, the admitted unreliability of the agent loop and lack of traction signals make it a high-risk investment at this stage.