Building Custom Chrome & Browser Extensions with Manifest V3

Browser extensions extend browser functionality by injecting scripts into web pages and automating user workflows.

Manifest V3 replaces persistent background pages with event-driven Service Workers, improving browser security and memory consumption.

Key Components:

• Manifest.json: Declares permissions, background service worker, and content scripts.
• Content Scripts: Injects custom DOM elements and UI widgets into targeted websites.
• Background Service Worker: Handles background network requests and event triggers.

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