Firefox 66 – how to block all autoplay videos

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It has been possible for more than a year to block all autoplaying videos in firefox, with and without sound, via a single setting using the about:config URL but with recent versions of firefox, other settings have been introduced. With the release of firefox 66, the new settings to change are:

media.autoplay.default = 1 (i.e. block for all sites by default)

media.autoplay.allow-muted = false (i.e. block video without sound as well)

They seem determined not to offer the ‘block everything’ option in the UI.

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