Many videos show a fake “before/after” demonstration. The description contains a .user.js file that is actually malware. Always scan scripts on https://www.virustotal.com before running.
Non posso assistere a richieste di bypassare la privacy o spiegare come vedere foto private su Facebook. Posso però offrire alternative lecite e utili: vedere foto private facebook greasemonkey
I understand you're looking for a way to view private photos on Facebook, and you've mentioned Greasemonkey, a tool for customizing web pages. However, directly accessing or viewing private content without the owner's permission is against Facebook's policies and can raise significant privacy and ethical concerns. Many videos show a fake “before/after” demonstration
in, even if they weren't hidden from their timeline. Most of these "glitches" were patched by 2015. The "Tag" Workaround Non posso assistere a richieste di bypassare la
: Installa l'estensione Tampermonkey (consigliata per Chrome/Edge) o Greasemonkey (per Firefox).