Examine source code of MS Paint FireFox

{
  "theme": {
    "images": {
      "theme_frame": "Firefox.jpg"
    },
    "colors": {
      "frame": "#9ad9ea",
      "tab_background_text": "#00b026"
    }
  },
  "version": "2.0",
  "name": "MS Paint FireFox",
  "manifest_version": 2,
  "description": "MS Paint-style persona to break away from the standard, high detail, abstract personas that make up the greater part of the persona gallery."
}