I have recently switched from Chrome to Firefox and unfortunately I am now unable to cast videos straight to my Chromecast (Ultra). I have tried multiple websites but the casting icon just wont appear on any of the videos. I am on the same network and I am running the latest version of Firefox. As far as I can tell, I do not have Flash on my phone so that should not be the issue. I have checked the about:config and the casting option is enabled (true). I have no other idea on how to fix the issue and would appreciate any advice. Thank you in advance.