Examine source code of Equals What

{
  "theme": {
    "images": {
      "theme_frame": "mozillapersona3.jpg"
    },
    "colors": {
      "frame": "#d90b0b",
      "tab_background_text": "#d90b0b"
    }
  },
  "version": "2.0",
  "name": "Equals What",
  "manifest_version": 2,
  "description": "A simple thing I just thought was cool"
}