Force mp4 videos to play in vlc web plugin.

I have, in about:preferences, set "Use VLC web plugin" as the default application for playing mp4 files, and have set media.play-stand-alone to false in about:config. However, when I open mp4 files, it plays in the firefox player, not the vlc player.
How do I remedy this situation.?

Your System Details shows;
Installed Plug-ins
Shockwave Flash 13.0 r0
VLC media player Web Plugin 2.1.5
VLC media player Web Plugin 2.1.3
Having more than one version of a program may cause issues.
Remove VLC totally, then re-install.
Update your Flash Player '''v16.0.0.257<br>https://www.adobe.com/products/flashplayer/distribution3.html'''
After, try again and let us know how it goes.

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