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I am learning chrome extension by example. Here is the example I currently learning: http://www.chrome-extensions.net/extensions/mappy/
There are three JavaScript files in this sample project: background.js mappy_content_script.js popup.js.
"mappy_content_script.js" is shown in the Combo box of Scripts tab of Developer Tools.
"popup.js" can be found if I right click the extension icon and choose "Inspect popup".
The problem is I can't debug "background.js" or find it in the Developer Tools. I tried insert "debugger;" in this JavaScript file. I also tried use profiling tool to record the script execution. However, when I click the link of "background.js", a blank page shows up. 
Is this a bug of chrome or did I miss something? Thanks
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Navigate to the chrome extensions management page at chrome://extensions and ensure developer mode is on. Click the Load Unpacked button and select the broken extension directory. After the extension is loaded, it should have three buttons: Details, Remove and Errors in red letters.
Visual Studio Code's debugging architecture allows extension authors to easily integrate existing debuggers into VS Code, while having a common user interface with all of them.
Google Chrome's Debug console is a powerful tool that can help us identify the cause of the errors (displayed in red) and speed up finding the solution.
The Chrome Web Inspector and Debugger are conveniently built-in with Chrome. You can launch it by hitting F12 while in your browser or by right clicking on a web page and selecting the Inspect menu item. The images below show a few different views that you'll see in the Chrome DevTools browser.
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.
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,
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