Revolution Slider Fullscreen HTML5 Video Firefox autoplay problem

I cannot get the intro video to autoplay on firefox.
this is the div tag I am using:
<div class="tp-fade fadeout rs-background-video-layer"
data-forcerewind="on"
data-volume="mute"
data-start="900"
data-videowidth="1920"
data-videoheight="1080"
data-videomp4="/assets/videos/ms-extended-promo-3.mp4"
data-videopreload="none"
data-videoloop="none"
data-responsive_offset="on"
data-forceCover="1"
data-aspectratio="1920:969"
data-autoplay="true"
data-videostartat="0:00"
data-nextslideatend="true">
</div>

I have also uploaded the video in youtube (id: W7_Ia6TDYhQ) and vimeo (id:492485073) but I can also not make it autoplay
purchase code: 8d10e288-b5fb-47e3-86d5-5ce5dcdcd0e5

I made the ticket private since, I added the purchase code.
Does it make a difference on the process time for you?
I don't have a problem opening another one public with less data

Thanks for the reply guys!
I added a small js script to force auto play on ff so now it is working.
You should probably consider it solved and if you want I can also post the script to help someone else maybe.

Great work by the way. Congrats it's an amazing template