# https://wiki.archlinux.org/title/HiDPI#Firefox
          # "layout.css.devPixelsPerPx" = "2.0";

          # https://wiki.archlinux.org/title/Firefox#Hardware_video_acceleration
          "media.ffmpeg.vaapi.enabled" = true;
          "media.ffvpx.enabled" = false;
          "media.rdd-vpx.enabled" = false;
          "media.navigator.mediadatadecoder_vpx_enabled" = true;
          "security.sandbox.content.level" = 0;