For some reason their video at the top doesn't show properly on Firefox on Windows. They have two versions, one .mov and one .webm. The .mov doesn't work for me while the .webm does, but that's the second video source so I guess it's not selected correctly. Maybe the .mov works fine on macs.

https://aem.dropbox.com/cms/content/dam/dropbox/warp/en-us/c...

It's not literally a gif and it is broken on Firefox.

There is a webm which seems fine in itself, but a broken quicktime .mov shows right on top of it, hiding it.

Where? There’s just an empty green box on firefox

Turns out, it’s HEVC video in a Quicktime container... Who thought that’s a good idea?