How to embed WebM

I need some help troubleshooting why embedded WebM works on some systems, but not others.

Does this embedded webM clip work for you without opening the link in a new page? What OS and browser are you using?

I’m embedding by just pasting the raw url in the message body:

Clickable link:

Here are my observations:

OS Browser Result
Ubuntu 20.04 Firefox 76 Fail
Ubuntu 20.04 Chrome 81 Fail
OSX 10.13.6 Chrome 81 Fail
Andorid 7 DuckDuckGo Works

I believe this used to work on Ubuntu 19.10, but I’m not going to downgrade to double-check.

Here’s what shows-up for me in Firefox: