How to change Mozilla default video player? I would like to know how to replace the default video player of Mozilla Firefox with the default Android video player on my Note 4.

My phone is not rooted.

Thank you in advance.
If you're on Android use this https://addons.mozilla.org/en-GB/android/addon/external-video-player/
( go to the website find the video but dont tap play instead open the firefox menu and select "play video externally" Firefox should ask which player to use select one I've tried this with VLC &amp; MX Player both worked. ) I used Firefox 54.0.1 which is the latest Firefox atm
For desktop I saw this https://addons.mozilla.org/en-GB/firefox/addon/video-assistant/ which I'm not sure if it works but from the look of the reviews it does.
Reasons why you'd want to use a different video player. If the video buffers, if you're getting pop-ups when playing video. 

The above method by Firelord didn't work for me ( should work for older Firefox versions &amp; useful if the extensions aren't available for your Firefox version ) 
media.fragmented-mp4.exposed isn't on 54.0.1 but I found media.mp4.enabled &amp; media.mediasource.mp4.enabled. I disabled one didn't work so enabled and disabled the other still didn't work also tried disabling both didn't work. Time to binge watch all seasons of adventure time lol