![Each attempt to view a video on a particular site I get this message," Video format or mime not supported". How do I fix this? | Firefox Support Forum | Mozilla Support Each attempt to view a video on a particular site I get this message," Video format or mime not supported". How do I fix this? | Firefox Support Forum | Mozilla Support](https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/images/2017-01-21-20-42-34-a28e4a.png)
Each attempt to view a video on a particular site I get this message," Video format or mime not supported". How do I fix this? | Firefox Support Forum | Mozilla Support
![Youtube Videos Not Playing in Firefox Browser || Youtube Won't Play on Firefox [9 WORKING Methods] - YouTube Youtube Videos Not Playing in Firefox Browser || Youtube Won't Play on Firefox [9 WORKING Methods] - YouTube](https://i.ytimg.com/vi/4DtSAZCj_SI/sddefault.jpg)
Youtube Videos Not Playing in Firefox Browser || Youtube Won't Play on Firefox [9 WORKING Methods] - YouTube
![Youtube Videos Not Playing in Firefox Browser || Youtube Won't Play on Firefox [9 WORKING Methods] - YouTube Youtube Videos Not Playing in Firefox Browser || Youtube Won't Play on Firefox [9 WORKING Methods] - YouTube](https://i.ytimg.com/vi/U5GGJlORy98/hq720.jpg?sqp=-oaymwEhCK4FEIIDSFryq4qpAxMIARUAAAAAGAElAADIQj0AgKJD&rs=AOn4CLBgU7SvsfabxvOF-uPncQ_vjZd20Q)
Youtube Videos Not Playing in Firefox Browser || Youtube Won't Play on Firefox [9 WORKING Methods] - YouTube
![Can't watch my own videos on youtube. But I can watch them if i am not signed into my YT account : r/youtube Can't watch my own videos on youtube. But I can watch them if i am not signed into my YT account : r/youtube](https://preview.redd.it/j6h18t35t1171.jpg?auto=webp&s=92428b80de1f7e8d0dc70b1f345f6e7179b5bb98)