This is an introduction to developing Chrome Extension for beginners. <br>This includes a fully working sample of the Chrome Extension. <br>Let's make your own Chrome Extension! <br>This book is compatible with Manifest V3 implemented in Chrome 88 released on January 19, 2021. <br>The Manifest V2 is likely to be deprecated in the future, so if you're starting now, we recommend Manifest V3. <br> <br>Index <br>Chapter 1. Very simple chrome extension. <br>Chapter 2. How to use localStorage. <br>Chapter 3. How to Debug. <br>Chapter 4. Browser Action and Page Action. <br>Chapter 5. How to use executeScript. <br>Chapter 6. How to use contextMenus. <br>Chapter 7. Control chrome tabs. <br>Chapter 8. How to use sendMessage. <br>Chapter 9. How to use Alarm. <br>Chapter 10. How to use content scripts. <br>Chapter 11. Open file and Sava to file.