Debugger Example does not work

**Describe the bug**
The debugger example gives: Unchecked runtime.lastError: Cannot access a chrome-extension:// URL of different extension.

Im pretty sure ```await chrome.debugger.sendCommand({ tabId }, 'Fetch.enable', { patterns: [/*...*/]})``` Is exactly what causes this.
```tabId``` comes from ```chrome.devtools.inspectedWindow.tabId```

 
**To Reproduce**
Clone the repo.
Install the debugger example
Go to a website.
Click the extension
Make a network request.
Notice this prints "Unchecked runtime.lastError: Cannot access a chrome-extension:// URL of different extension"

**Expected behavior**
This should work

**Screenshots**


Anything additional here. 🌈
This does not happen with Microsoft Edge.

Install and run the debugger example, then reproduce the error by opening a website, clicking the extension, and making a network request. Start at the chrome.debugger.sendCommand call using chrome.devtools.inspectedWindow.tabId; done means the request completes without the cross-extension runtime error, matching the behavior reported in Microsoft Edge.

Written by the indexing model from the issue text.