example site of the problem so others can find a solution?

WestEnd said

example site of the problem so others can find a solution?

Any video that uses HTML5. Example? Any Youtube video. You'll notice when you open up a youtube video, it will begin buffering and autoplays the video.

The setting: media.autoplay.enabled will prevent videos from automatically playing, but the video still buffers. This means internet bandwidth is being consumed to load the video's content.

I ideally want to prevent any video, like Youtube, from loading until I actually ask it to play.

There isn't a built-in feature for this. Add-ons can block various kinds of content from loading in the first place, which probably is the most logical approach, but I don't know of a good one targeted to this specific issue.

The trouble is I couldn't find any addins which work with current versions of Firefox. Is there a "suggestions" page so I could ask for the feature to be implemented?

Edit: I imagine such a feature could prevent video ads from loading and playing on pages. This could provide some big speed improvements to other users. This feature would be great!