Firefox Knowledge Base

Disable Video Autoplay

Go to Settings > Privacy & Security > Permissions > Autoplay > Settings.

Select Block Audio and Video and click on Save Changes.

Type about:config in the address bar.

Set the following preferences:

• media.autoplay.default = 5
• media.autoplay.blocking_policy = 2
• media.autoplay.allow-extension-background-pages = false
• media.autoplay.block-event.enabled = true
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