Hello, i run a PC with a WIN 10 Pro N version since 2 weeks. Bevore i had the WIN 7 64 N version and everythink was nice. The win version on the istall-usb stick ist downloadet fresh from microsoft and my hard drive is formatted. The version of Firefox is 89.0.2 (64-Bit). With Win 10 Pro N firefox couldn't play Videos on most platforms (vimeo, twitter, all player from bs.to...) youtube is the only page that works. The videos don't run in save mode. I have look for a lot of help-pages for this proplem, nothing works(e.g. download file xxx from mikrosoft, install program xxx, disable addons, reinstall firefox; change xxx in firefoxsettings...). I have ask some friends to look and they didn't found anything (because of EIFOK/ PEBKAC/ PICNIC [choose yourself] ^^). I have test same pages in Edge and there the videos work perfect. Vimeo says: "Fehler im Player Beim Player gibt es ein Problem. Wir werden versuchen, ihn so schnell wie möglich wieder betriebsfähig zu haben." Some other pages shows me: "The media playback was aborted due to a corruption problem or because the media used features your browser did not support."