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May be you have seen that whenever a video appear on your facebook news feed, the media will automatically start with the audio enabled. It can happen both desktop and mobile. However, there is an extension that block this autoplay videos on facebook and also on other sites that are accessed from desktop browser. The Disable HTML5 Autoplay plugin is available for chrome and opera browser.
Extension for disable html5 autoplay videos
After activated, then extension prevent any videos, audios and also ads to start automatically. The user also can know how many videos were blocked by the extension icon, which is located in the upper right corner of the window.

The plugin also has an area for configuration, which can be used to include site exception. That means, the user can list the sites where the plugin should not act.

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