Examine source code of www.heywetried.com

{
  "theme": {
    "images": {
      "theme_frame": "firefox_top.jpg"
    },
    "colors": {
      "frame": "#4ce1ff",
      "tab_background_text": "#2b2b2b"
    }
  },
  "version": "2.0",
  "name": "www.heywetried.com",
  "manifest_version": 2,
  "description": "Backdrop for \"hey ! ( we tried ) : productions\" website\n\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/b9b00f94b7420718ef69fbc0c858e572a3ff87c84187c1d2d72349230e1ab347/http%3A//www.heywetried.com/\">http://www.heywetried.com/</a>"
}