Go here: https://unop.uk/dev/how-to-watch-bbc-news-videos-on-a-desktop-without-flash/
basically create a new item in about:config called general.useragent.override and paste
Mozilla/5.0 (Linux; Android 4.4.4; en-us; Nexus 5 Build/JOP40D) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2307.2 Mobile Safari/537.36
into it.