This extension is a fork of github.com/MagicJinn/MrBeastify-Youtube. I would highly recommend checking out their extension, as it provided the source code to make this possible. This essentially adds Ceres Fauna from Hololive English to every YouTube thumbnail. This extension is not finished yet, more testing will be done and many more images added. I hope you enjoy!
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Install

• License: GNU General Public License v3.0 or later
• Weekly downloads: 1
• Average daily users: 1
• Rating: 0/5 of 0 ratings
• Created: 2023-07-17 01:24:05
• Last updated: 2023-08-02 00:55:33
• Homepage: https://github.com/Zeppelins-Forever/CeresFaunafy-Youtube
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/youtube-ceresfaunafy/
• API: {bfa467a4-9a09-4a6c-9984-c689d823a91e}