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For Firefox: About:Config setting media.autoplay.enabled to false. For Chrome: Chrome://flags set autoplay policy to "Document user activation is required". I

For Firefox: About:Config setting media.autoplay.enabled to false. For Chrome: Chrome://flags set autoplay policy to "Document user activation is required". I know that this breaks animated .gifs in Firefox, though you can get them to animate by viewing the image info (right-click menu). That's rarely a big loss anyway.

saagarjha 9y ago
Safari 11 has this behavior as the default.
f1nch3r 9y ago
The Chrome trick may work for some sites but not others, most notably CNN.