This Trick For Iphone User: (Download Firefox Click Here)
  • 1    Open Safari or Firefox and navigate to YouTube’s website.
  • 2.   Look up the video that you want played in the background.
  • 3.   Hit the play button, and then leave the app. Your video will stop playing at this              point, don’t worry.
  • 4.   Bring up Control Centre by swiping up from the bottom edge, and then swipe left to      the media pane.
  • 5.   Hit the play button, and it should resume from where it stopped.
This Trick For Android Phone Users: 
(Download Firefox Click Here)
  • 1  Open Firefox and navigate to YouTube’s website.
  • 2. look up the video or playlist that you want played in the background.
  • 3  Hit the play button, and then leave the app. Your video should continue playing.