I'm using Firefox

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I don't stream videos as I don't have good internet connecting. So, I download all videos of a series I want to watch. But most of the time I come back to video page just to look into comments ( most of times I found good tips about the video in that page)
the problem is whenever I load a page it starts playing the video. I had to stop them manually every time. this is quite annoying.
Is there options to stop them auto-playing ?
thanks.
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