Describe the bug
In lesson 5-3, there are two lines of code that need to be changed. In the background.js file, line 3 and line 11 give errors, causing the extension's icon to not update colors correctly.

To Reproduce
Follow the guide for lesson 5-3 normally and then build and run the extension

Expected behavior
The extension icon should change colors automatically

Screenshots

Desktop:

• OS: Windows 11
• Browser Brave
• Version 1.76.82 Chromium: 134.0.6998.178 (Official Build) (64-bit)