How do I check for JS errors in my PC browser?

You can check for JS errors from the console screen of your browser. The official documentation site of each browser has instructions on how to access the console.

Accessing the browser console screen

Google Chrome

See Chrome Developers Documentation: Open Chrome DevTools.

Mozilla Firefox

See "Opening the Web Console" in Firefox Source Docs: Web Console.

Microsoft Edge

See "Open the Console" in Microsoft Documentation: Console features reference.