To play video formats %S, you need to install extra Microsoft software, see https://support.mozilla.org/kb/fix-video-audio-problems-firefox-windows
Akken ad turareḍ amasal n tvidyut %S, tesriḍ ad tesbeddeḍ aseɣẓan nniḍen Microsoft, wali https://support.mozilla.org/kb/fix-video-audio-problems-firefox-windows