To play video formats %S, you need to install extra Microsoft software, see https://support.mozilla.org/kb/fix-video-audio-problems-firefox-windows
Richin yetzij kib'anikil silowachib'äl %S, k'atzinel niyak rutz'aqat kema' Microsoft, tatz'eta' https://support.mozilla.org/kb/fix-video-audio-problems-firefox-windows