stdavid

I got that far... yesterday I spent the whole day frustrated... omg. Actually the coders should know the answer. because it happened after closing firefox with ccleaner. I assumed that maybe some service or whatever was terminated... I have plugins and the codecs like in your screenshot. videos only work in edge and chrome. Firefox, Opera and Waterfox probably have the same building blocks and even refuses to watch movies from the desktop that I can easily watch with VLC. I'll post the solution later if I find out.

already done this. it must be something else

i tried to disable plugins with ccleaner and... I would have to close the firefox application for that... After that I can't see videos ANYWHERE... only on YouTube. There is an html5 error or “hls fatal error”. but everything works in chrome!!!... And that's definitely not due to adblockers or other security stuff! I've tried everything possible. also new install. version without cookies/old files in the private window etc. the same problem with opera, vivaldi or waterfox... so what the hell did ccleaner disabled there????