Examine source code of Simple Atom

{
  "theme": {
    "images": {
      "theme_frame": "simpleatompersona.jpg"
    },
    "colors": {
      "frame": "#0ccc2c",
      "tab_background_text": "#de1414"
    }
  },
  "version": "2.0",
  "name": "Simple Atom",
  "manifest_version": 2,
  "description": "A Simple Atom for Firefox"
}