How to mute Facebook auto-play videos
Tap More (the button with three horizontal lines - near the bottom-right) Tap Settings Tap Account Settings Tap on Sounds Disable ‘Videos in News Feed Start With Sound’
Tap More (the button with three horizontal lines - near the top-right) Tap App Settings Disable ‘Videos in News Feed Start With Sound’
If you’re on a desktop, you will need to mute your system, or you can use a Google Chrome extension such as AutoMute or Mute Tab.
