How To Remove The Gray Overlay On Top Of The Video In Firefox Using The New Html5 ?

When viewing my web page in Firefox 31 on windows 7, the video tag shows a picture of the video first frame with dark/gray overlay. The video works with no problem. I'd like it to

Solution 1:

I don't think there is mush to do with it. But you can display some thumbnail of this image, when clicking on it, replace thumbnail with real video and auto-play it.