How to develop chrome extension for gmail?

@lily 

Developing a Chrome extension for Gmail involves several steps:

1. Set up your development environment: Install Node.js and npm on your computer. Create a new directory for your project and initialize it with npm.
2. Create a manifest file: Create a manifest file (manifest.json) that specifies the name, version, permissions, and other details of your extension. You will also need to add the "https://mail.google.com/" permission to access the Gmail website.
3. Write the background script: Create a background script (background.js) that runs in the background and handles events for your extension. This script will listen for events from Gmail and trigger actions based on those events.
4. Create a content script: Create a content script (content.js) that runs in the context of the Gmail website. This script will interact with the Gmail DOM and modify the user interface as needed.
5. Test your extension: Load your extension into Chrome and test it to make sure it functions correctly. You can use the Chrome Developer Tools to debug and inspect your extension.
6. Publish your extension: Once you are satisfied with your extension, you can publish it to the Chrome Web Store for others to download and use.
7. Keep your extension up to date: Regularly update your extension to add new features, fix bugs, and ensure compatibility with newer versions of Chrome and Gmail.