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For most apps, the option to disable autoplay videos will be hidden somewhere in the settings. For example, with Facebook you’ll find the option to disable autoplay video under your account settings.
With the Facebook app, you’ll find it under Settings > Account settings > Videos and Photos Set it to “Never Autoplay Videos” to kill that off.
If you’re surfing from your laptop or desktop though, Chrome, Firefox and Opera will offer you the easiest options to block autoplay videos.
With Firefox, you’ll need to adjust the advanced settings of the browser itself. Do this by typing “about:config” in the URL bar, and click the “I’ll be careful, I promise button.” Search for “media. autoplay” and double-click it toggle its status to off.
With Chrome and Opera, just download the Disable HTML5 Autoplay extension from the respective webstores. This is a fairly effective extension that disables autoplay but allows you to click to view the video. Unfortunately, the author has stopped development in light of Google’s upcoming version, but it continues to be one of the best (and easiest) ways to avoid autoplay shock, so we’d use that for now.