[Steps to reproduce]:
- Open the Firefox browser and reach about:preferences#privacy > Permissions section.
- Uncheck the "Block websites from automatically playing media with sound" option.
- Reach Facebook and login.
- Scroll until videos are in view.
The Videos should play without sound since the Block autoplay feature is turned off.
The Videos will not start until the user clicks them.
Note: This issue does not occur on Windows or Mac.
Please also note that on Ubuntu The Facebook settings for videos do not have the Option to turn Autoplay ON - OFF.