How do I disable the Facebook Video autoplay?

For computers:

Go to your options drop-down menu in the top right.

Click "Settings"

Select the "Videos" link on the left.

Turn the "Auto-Play Videos" from "ON" to "OFF"


For Phones and tablet apps:

You can adjust your auto-play settings to On, Wi-Fi only or Off. If auto-play is On, the data used depends on the amount of time you spend watching a video. If you scroll past an auto-play video in News Feed, your phone will use less data than if you stop to watch it for a longer period of time. If auto-play is set to Wi-Fi only, no data will be used.

To adjust your auto-play settings:

Android

Open the Facebook app

Tap your phone's menu button

Tap Settings

Scroll down and tap Video Auto-play

Choose an option 

iPhone and iPad

Go to your phone or tablet's settings

Scroll down and tap Facebook

Tap Settings

Below Video tap Auto-play

Choose an option