UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0

Example URL:
https://www.cnn.com/style/article/banksy-painting-questions-intl/index.html

Steps to reproduce the problem:
1. Open any page with video content or ads with videos (the URL I provided was just one example)
2. Observe that the video autoplays regardless of any settings
3. 

What is the expected behavior?
I expect to be able to disable autoplay globally. The setting should affect all video content from all sources (this includes ads)

What went wrong?
I am unable to disable video autoplay. 

Did this work before? No 

Is it a problem with Flash or HTML5? HTML5

Does this work in other browsers? N/A

Chrome version: <Copy from: 'about:version'>  Channel: n/a
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Shockwave Flash 31.0 r0

Contents of chrome://gpu: 

I tried setting the chrome://flags/#autoplay-policy to "Document user activation required" with no change in behavior.