Fix Chrome Extension Popup Bug

I already have the full source code for a simple Chrome extension, but something breaks the moment I click the toolbar icon. The popup either refuses to behave or throws an error I cannot trace. I only need a surgical-level tweak: locate the root cause, patch it, and supply the updated files...

(Budget: ₹1500 - ₹12500 INR, Jobs: CSS, Debugging, Frontend Development, Google Chrome, HTML, JavaScript, PHP, Web Development)