Fórum da Comunidade de Firefox

youtube has failed to open fr 2 weeks now, it was working well before but on opening it of recent, it displayed this message below till now yet other tabs open well and my internet connection is stable

Unable to connect

Firefox can’t establish a connection to the server at www.youtube.com.

   The site could be temporarily unavailable or too busy. Try again in a few moments.
   If you are unable to load any pages, check your computer’s network connection.
   If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the web.

FF147.0.1 64bit Linux

I have about:config > toolkit.legacy ... stylesheets set to true, but how can I determine if FF actually 'loaded' the file <profile>/chrome/userChrome.css ?

Alternatively, is there a css tweak that is known to still be working in FF147?