Hugging Face released a Transformers.js demo browser extension powered by Gemma 4 E2B. Nico Martin's guide details running local AI in a Chrome extension under Manifest V3 constraints. The architecture uses a background service worker for model hosting and inference, a side panel for chat UI, and a content script for page actions. All inference runs locally, with Gemma 4 handling reasoning and MiniLM generating embeddings for semantic search.
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