Video works on some but not all browsers


I use a video file as the background for my index page and have also uploaded a fallback image. The video/image work on Chrome and Safari, but on Firefox the space where the video/image should be visible is black. Any ideas on what’s going on/how to fix this? The video is only 7.9MB so I know it’s not a size issue.

Here’s the app:

Thank you!

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