Vine and other HTML5 videos won't play
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Some HTML5 videos (especially Vine videos) won't play on Windows. You can quickly work around this issue by changing a Windows Media setting.
In the Location bar, type about:config and press EnterReturn.
- The about:config "This might void your warranty!" warning page may appear. Click to continue to the about:config page.
- Search for: media.windows-media-foundation.enabled.
- Double-click the setting to change its value to false.
- Finally, reload the page with the video and it will work.
This workaround should cause the website to give you a Flash video. If you don't have Flash installed, see Install the Flash plugin to view videos, animations and games.