This is a demo Google Chrome extension built following the Chrome Development Basics guide.

• Go to chrome://extensions
• Toggle "Developer Mode"
• Click "Load Unpacked Extension"

Click the reload button on the extension on the page above.

See: https://developer.chrome.com/docs/extensions/mv3/getstarted/development-basics/#logs

TLDR:

Add the following script to the relevant HTML file:

<script src="popup.js"></script>

Create a popup.js file and add the following code:

console.log("This is a popup!")

Refresh the extension, open the popup, right-click on the popup and inspect it. You'll see the logs under the Console panel.

Any errors are displayed within the extensions page, on the extension (see the "Error" button).