How to Use Transformers.js in a Chrome Extension

A guide details how to build a Chrome extension using Transformers.js under Manifest V3 constraints. The architecture places AI models in a background service worker, with a side panel for the user interface and a content script for interacting with web pages. It utilizes a Gemma model for text generation and a MiniLM model for embeddings, running all inference in the background to ensure a responsive UI and a shared model cache. The system relies on a clear messaging contract between the different extension components and implements an agent-based tool execution loop for functionality.