Extension Not Working: "Can't read and change data on this site" Error

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I'm experiencing an issue with the "Udemy - Improved Course Library by Tad Wohlrapp" extension on Firefox. The extension icon is dimmed, and when I hover over it, it says "Can't read and change data on this site." I've ensured the extension is allowed to "Run on sites with restrictions" in the settings.

Steps to Reproduce:

• Install "Udemy - Improved Course Library by Tad Wohlrapp" extension on Firefox.
• Navigate to the Udemy website.
• Attempt to click on the extension icon.

Troubleshooting Steps Taken:

• Allowed the extension to "Run on sites with restrictions" in the extension settings.

Browser and Extension Information:

• Browser: Firefox
• Extension Version: latest
• Operating System: arch linux

Screenshots: