Diễn đàn hỗ trợ 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.

Mozilla repeatedly fails to connect to the server at https://hqpaperround.net/ which I need daily. It connects to any other website I request. I am using an old laptop after my shop desktop broke down. It has never connected to that site. Can you suggest why?

Non of the torproject.org site load on firefox they timeout. How do I access the torproject.org domains?

I have a 100% repro rate of Firefox redirecting linkedin.com to linkedin.cn. Unfortunately there's another problem beyond the unwanted redirection: linkedin.cn no longer exits, it has been dead for years, I literally cannot reach LinkedIn at all. It was working fine a week or two ago. How do I prevent Firefox from redirecting behind my back? I see the status message (is that what it's called) in the lower left corner "Performing TLS handshake to www.linkedin.cn" and of course it only times out. I just verified with "Web" (different browser), it connects just fine, which suggests that it's a Firefox issue, not a system wide one.