What video? Do we have to have a login to see video? Post a screenshot and a link showing the issue.

'''¡ Hey jack !''' Here are some possible solutions to your problem! '''Check volume control for Firefox in the Volume Mixer''' The Volume Mixer has a specific volume control for Firefox. Check the Volume Mixer and make sure the volume level for Mozilla Firefox is not low or muted. '''Reload the website''' Sometimes a change you make in the system settings, such as selecting another sound device in the Volume Mixer, may not be applied correctly in an already open tab. Try reloading the website to see if it solves the issue. '''Allow autoplay of media with sound''' Firefox may be blocking media with sound from playing automatically. To allow media autoplay, see Allow or [https://support.mozilla.org/en-US/kb/block-autoplay block media autoplay in Firefox]. '''HTML5 audio and video''' Firefox has built in support for open media formats usually associated with MP3, WebM, Ogg, and Wave containers. However, MP4 containers usually depend on platform decoders for AAC and H.264 audio and video streams. For more information, see [https://support.mozilla.org/en-US/kb/html5-audio-and-video-firefox HTML5 audio and video in Firefox]. '''You may need the latest Media Feature Pack for N versions of Windows''' Windows N versions are missing Windows Media Player and related software for media functions. You may need to install or update the Media Feature Pack from Microsoft. See Fix video and audio problems on Firefox for Windows N editions for details. Official mozilla contributor

Are you allowing audio and video ? *https://support.mozilla.org/en-US/kb/block-autoplay Do you see any relevant-looking media messages in the Web Console ? *https://developer.mozilla.org/en-US/docs/Tools/Web_Console