Bookmarklet to convert a gif URL or the first gif image in a DOM to gfy: http://hastebin.com/raw/quzumamebe / compressed with: http://jscompress.com/

gfybookmarklet

javascript:(function(){
  // if URL is gif
  if (checkGifURL(document.URL)) {
    window.location.replace("http://gfycat.com/fetch/" + document.URL);
  }
  // first gif in DOM
  else {
    var imgs = document.getElementsByTagName("img");
    for (var i = 0; i < imgs.length; i++) {
      if (checkGifURL(imgs[i].src)) {
        window.location.replace("http://gfycat.com/fetch/" + imgs[i].src);
      }
    }
  }
  function checkGifURL(url) {
    return(url.match(/\.(gif)$/) != null);
  }
})();