It doesn't do anything - videos from Web sites still load and play. The keyboard shortcuts don't stop the loading and displaying either.

stupid add-on. It just stops displaying flash or videos, though they still keep on getting downloaded consuming huge bandwidth. Seems the add-on developer hasn't even understood the meaning of blocking something - that is, something should not even download. uninstalled it.

Maybe I haven't understood something. I thought this add-on would allow me to block certain videos on YouTube. Instead, it blocks all videos on YouTube. Every time I try to add the link to a certain video it changes that link to m.youtube.com and I can't watch any video at all.

very bad design

Just as others have said, this doesn't block videos from loading or playing. It only blocks you from being able to see the videos that are playing. The videos still take up memory and the audio still plays. I'm looking for an app that functions as well as disabling media.autoplay.enabled, but on a play-to-click basis. Autoloaded videos I have no interest in while scrolling webpages are a waste of everyone's bandwidth.

How effing stupid this is. It blocks the video, but leaves on the audio? What's the point? Hello, videos usually come with audio.

It says "requires newer version of Firefox (at least version 48.0)" but the latest version that I can find is 47.0.2.

Blocking of Canvas Elements don't work.

A quick test of a simple web site caused no change when configured. The page loaded totally normally and displayed all visual content in spite of the addon's advertised behavior.

I tried this specifically to block videos that play automatically on Yahoo! because they severely degrade browser performance. Unfortunately, it does not work with Yahoo!, which is the only site I have tested this with.