Either navigate away from the tab before the video starts playing or navigate to another tab while the video is playing (action bar needs to be visible). Tab with video can also be closed.
Expected Behavior: Video is not present in current tab
Actual Behavior: Video displays over current tab and does not stop playing when tab is closed.
URL: http://www.sportsnet.ca/hockey/world-cup-of-hockey/world-cup-of-hockey-power-rankings-team-canada-usa-russia-north-america-sweden-europe-finland-czech-2016/
Browser / Version: Firefox Mobile 51.0
Operating System: Android 6.0.1
Problem type: Something else - I'll add details below
Steps to Reproduce
Expected Behavior: Video is not present in current tab
Actual Behavior: Video displays over current tab and does not stop playing when tab is closed.
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