About debugging chrome extension
Nowadays you have to install a Chrome extension to allow you to inspect the view of a page, specifically the Develop and Debug Chrome Apps & Extensions
background.js
is loaded in the background. To inspect it visit chrome://extensions
, find the loaded extension, and "inspect active views" for the background script.
Edit
Below is a screenshot of the chrome extensions page. A click on the link background page
opens the background page for this extension.
Additional information
EDIT 2020
Here is how you can see the content scripts and debug,