How to Use Transformers.js in a Chrome Extension
AI Summary
This guide explains how to build a local AI browser assistant in a Chrome extension using Transformers.js under Manifest V3 (MV3) constraints, featuring Gemma 4 for text generation and MiniLM for embeddings.
Key Takeaways
- The background service worker acts as the control plane for model execution, state management, and tool coordination to prevent duplicate model loads.
- Typed messaging enums handle communication securely between the side panel, background script, and content scripts.
- The agent execution loop separates internal model prompts and transcripts from user-facing chat messages to support deterministic tool calls.
Why it matters
Running local AI models directly inside a Chrome extension preserves user privacy and eliminates cloud API costs, but requires careful orchestration across MV3 background service workers, side panels, and content scripts.
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