Follow the directions in the README.md of the following github to get it working.
https://github.com/CrabbleOrNiceTry/NetflixExtension

Install

• License: GNU General Public License v2.0 or later
• Weekly downloads: 1
• Average daily users: 7
• Rating: 5/5 of 1 ratings
• Created: 2021-10-25 02:15:56
• Last updated: 2021-10-25 06:11:37
• Homepage:
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/netflix-imdb/
• API: Netflix-IMDb-Rating@github.com