1. Create a manifest.json
In this manifest, I will declare a browser action, and the activeTab permission
Download a icon.png as an icon for this chrome extension
helloWorld.html will be rendered inside the popup window that's created in response to a user's click on the browser action.
3. Load the extension and test (remember to turn on developer mode)
1. Create a helloWorld.js
2. Import helloWorld.js into helloWorld.html
3. Reload the hello world extension and test