Twitter videos have an annoying tendency to stop when you scroll down or go to a different browser tab. Counter-intuitively, this behavior is controlled by the Video Autoplay setting. If you turn that setting off, videos will keep playing when you scroll or go to a different tab.
To disable Video Autoplay:
- Click on your picture in the upper right-hand corner of the screen.
- From the menu, click Settings and Privacy.
- The Account menu item on the left will automatically be selected
- In the Security Section uncheck Video autoplay