This will maybe solve the "InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable" error in firefox.
@@ -2612,7 +2612,7 @@
// Start video playback
var currentVideo = currentBackground.querySelector( 'video' );
if( currentVideo ) {
- currentVideo.currentTime = 0;
+ if(currentVideo.currentTime > 0) currentVideo.currentTime = 0;
currentVideo.play();
}