Examine source code of Hand-Written

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#cccccc",
      "tab_background_text": "#f20c0c"
    }
  },
  "version": "2.0",
  "name": "Hand-Written",
  "manifest_version": 2,
  "description": "The word \"FIrefox\" is hand-drawn across the right. Made with GIMP."
}