From: MrPounder@RationalThought.com   
      
   Using Firefox 52.01 es2 or something. It's the latest ediition.   
   XP SP3.   
      
      
   Youtube videos don't work, but work okay using SeaMonkey.   
   I'm on Virgin Media, 75 down. When I moaned the engineer came round and   
   fitted the Superhub 3, checked and corrected the downstream levels which   
   were high and said that all was   
   okay.   
   Youtube still hung up. He said that he did not know why and left.   
   I've asked in the Mozilla group, but nobody replied.   
      
   Error message is:   
   "Your browser does not currently recognize any of the video formats   
   available. Click here to visit FAQ about HTML5 video"   
   Either that or "Your browser does not support HTML5 videos"   
   I can watch videos from the BBC etc, but not youtube.   
      
   I deleted Firefox Profiles, the problem was still there.   
   I deleted Firefox using Revo Uninstaller, downloaded and installed Firefox.   
   It made no difference to youtube.   
      
   I've used Malwarebytes, AVG, Superantispyware, CCleaner, defraged etc.   
   Am I missing something?   
      
   Thanks.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)