Steam has new feature to share videos you record in game, but all other browser can open the link and play the video but fire fox cant. https://steamusercontent-a.akamaihd.net/ugc/2908503276065776/12BDB6E6A7688F3E6BD2CB7DAA73A4AE85859D88/ Could not be decoded, error: Error Code: NS_ERROR_DOM_MEDIA_NOT_SUPPORTED_ERR (0x806e0003) Details: Utility MF Media Engine CDM only support for media engine playback