Gfycat - Jiffier gifs through HTML5 video conversion
If someone can create a simple Firefox/Chrome addon that takes imgur .gif links, and automatically converts the URL from this:    http://i0.kym-cdn.com/photos/images/original/000/666/838/7fb.gif

To this:    gfycat.com/fetch/http://i0.kym-cdn.com/photos/images/original/000/666/838/7fb.gif

I'm sure it would easily become a top 20 addons hands down.