wordtube video doesn’t scale 100% height in firefox

Hi all, i’m very happy with this forum it really helps me !
here is my question.
In my blog https://www.naiveblog.com, i’m using wordtube to show some video, it’s working great execpt that in my home page my video scale is widht=100% height=100% that’s what i want, a full screen video, but FIREFOX does’nt support the height 100%.

Do anyone have an idea ? how can i bypass this bug ?

Thanks
Johann