@Rohn123123 : try going to Menu -> Help and Report -> Troubleshoot Mode... and test YouTube and Facebook there.
If they work correctly, an extension (Menu -> Extensions and Themes) you use in the regular mode, such as AdBlock, Adblocker Ultimate, AdGuard, Dark Reader, Ghostery, Noscript, uBlock Origin, is likely the cause.
If you still have an issue even in Troubleshoot Mode... , it's likely the anti-virus or anti-malware product you use on your computer that is intercepting website traffic between Firefox and your router.
