mpv can play youtube and many other videos from video hosting services through yt-dlp but it can’t play DRM content like Netflix or Spotify MPV also can play video from TTY so you don’t need graphical interface like xorg or wayland to play videos

I can but this shortcut is very convenient

Firefox is very customizable so I thought I can edit some settings in about:config to fix this

Does your keyboard have 13 number keys? How do you have 13 work spaces?