There are numerous fake accounts and Facebook doesn't seem to do anything effective against them. The group "Kamuprofil Rendorseg" searches for fake accounts and reports them on their own page.
This plugin uses those reports and puts the fake accounts into a list. When you open a page, those accounts will be automatically marked with a red label saying "fake account".

https://www.facebook.com/Kamuprofil-Rendőrség-107971161836170

Install

• License: GNU General Public License v3.0 or later
• Weekly downloads: 0
• Average daily users: 1
• Rating: 0/5 of 0 ratings
• Created: 2022-03-20 21:58:39
• Last updated: 2022-03-21 08:31:57
• Homepage:
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/kamuprofil-rendorseg/
• API: {0d7cfec8-ba5b-436f-97b3-456a1279eca0}