URL: http://www.zdnet.com/video/australian-defence-looking-for-multiple-unmanned-war-vehicles-controlled-by-single-person/

Browser / Version: Firefox 58.0
Operating System: Windows 10
Tested Another Browser: Yes

Problem type: Video or audio doesn't play
Description: Video or audio doesn't play
Steps to Reproduce:
I tried it on Chrome, it worked
layout.css.servo.enabled: true

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