What it does
It adds a browser action. The browser action has a popup that lets the user choose one of three browsers: Firefox 41, Chrome 41, and IE 11. When the user chooses a browser, the extension then rewrites the User Agent header so the real browser identifies itself as the chosen browser on the site https://httpbin.org/.
What it shows
- how to intercept and modify HTTP requests
- how to write a browser action with a popup
- how to give the popup style and behavior using CSS and JS
- how to send a message from a popup script to a background script