Example Chrome Extension - Extension environment details, tab and window dashboard
Example Chrome Extension - Modify extension toolbar icon button, context menu
Example Chrome Extension - Extension messaging demo
Example Chrome Extension - Devtools Traffic Monitor
Example Chrome Extension - Declarative net request

Example Chrome Extension

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Open source browser extension with dozens of browsable demos. Zero NPM packages, one click install, 100% HTML/JS/CSS.
Building Browser Extensions, 2nd edition by Matt Frisbie
Updated for 2025 with expanded coverage of brand-new APIs, frameworks, and best practices.

The ultimate
Chrome extension tutorial

Building Browser Extensions shows you how to build modern Chrome extensions with in-depth examples and detailed tutorials.
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