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How do I stop imbedded videos from running automatically?

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I am running Firefox on Windows XP. When I click on a link that contains a video it will automatically begin playing. It does not happen with every such video. Typically the sites are news sites.

I am running Firefox on Windows XP. When I click on a link that contains a video it will automatically begin playing. It does not happen with every such video. Typically the sites are news sites.

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Flashblock works on most videos.

https://addons.mozilla.org/firefox/433/