How do you stop HTML5 video from autoplaying?

I don't want video to play automatically. Flashblock achieves this for flash videos, but there doesn't seem to be a way to do the same thing for html5 video (on vine, for example).
None of the about:config settings appear to have any effect, and html5 isn't handled by a plugin so click to activate doesn't do anything either.

I confirm `flash-control`stops autoplay for html5 and old Flash videos (attached screen), plus it has a comprehensive little FAQ right on the extension page :)
Unlike `about:config` and other extensions I tried in vain.
Thanks @FredMcD @fledermaus for mentionning the former.
https://addons.mozilla.org/en-US/firefox/addon/flash-control/

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    Hi. I wanted to get a couple of points of view (if you're willing to look ) on how others would do this because Im not sure where to even start.
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              public var videoX:Number;
              public var videoY:Number;
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              public var projectOneTotal:Number;
              public var projectOneXML:XML;
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              public var pauseBtn:VideoPauseBtn;
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                   player.skinBackgroundColor = 0x47ABCB;
                   player.skinBackgroundAlpha = .85;
                   player.x = 40.3;
                   player.y = 220;
                   player.width = 1200;
                   player.height = 594.2;
                   videoContainer.addChild(player);
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                   trace("addButtons initiated");
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                   playBtn.x = 625.6;
                   playBtn.y = 930;
                   pauseBtn = new VideoPauseBtn();
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                   pauseBtn.x = 625.6;
                   pauseBtn.y = 930;
                   pauseBtn.visible = false;
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                   videoContainer.x = 0;
                   videoContainer.y = 0;
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                        pauseBtn.visible = ! player.paused;
                   } else if (player.stopped) {
                        player.play();
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                        pauseBtn.visible = true;
                   } else {
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    thanks for any input you can give!!! 
    Note: All of this code works as it is and I am getting no errors.

    Ok, how about this:
    After reviewing my code again, this is what I find.
    I process the xml and then never use it when playing the video. To play the video I had just put the path straight to the video and not even used the xml. In the xml.
    So I guess my question is how to I refer to the xml to load the video and then when dealing with the buttons lead to the right video from the xml.
    kglad: Now I think I see why you were saying define a method of the ProjectOneVideos class that accepts a path/name string to the load target.
    I think the code I need to change is:
         if (player.playing || player.paused) {
                        if (player.paused) {
                             player.play();
                        } else {
                             player.pause();
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                        pauseBtn.visible = ! player.paused;
                   } else if (player.stopped) {
                        player.play();
                        playBtn.visible = false;
                        pauseBtn.visible = true;
                   } else {
               //this is the part that needs to be changed to recognize from the xml
                        player.play("videos/projectOneVideos/videoOne.f4v", 0, false);
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                        playBtn.visible = false;
    But then I have to be able to pull the right video when I hit the button.
    So, what tools should I be using?

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