Create a button to pop-up the youtube video

youtube.com.js

/*
 * Copy this in ~/.js/youtube.com.js
 * Tested with dotjs for Firefox: https://addons.mozilla.org/en-US/firefox/addon/dotjs/
 */

if(m = /v=(\w+)/.exec(location.href)) {
  $("<button>").
    text("Open").
    css("position", "fixed").
    css("top", "1em").
    css("left", "1em").
    css("padding", "0.5em").
    css("border-radius", "0.5em").
    css("border", "1px outset #333").
    css("font-size", "200%").
    css("background", "-moz-linear-gradient(top, #777, #ccc)").
    click(function() { window.open("http://www.youtube.com/embed/" + m[1], "_blank", "menubar=no"); }).
    appendTo(document.body);
}

zomg.png