Uses mostly a CSS file and a little bit of Javascript to inject CSS.

Can be tested on this page, without an account
https://myanimelist.net/forum/

Install

• License: Mozilla Public License 2.0
• Weekly downloads: 9
• Average daily users: 79
• Rating: 5/5 of 2 ratings
• Created: 2023-01-27 15:19:29
• Last updated: 2023-05-20 04:50:30
• Homepage:
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/myanimelist-dark-mode/
• API: maldarkmode@gmail.com