Examine source code of Simply orange

{
  "theme": {
    "images": {
      "theme_frame": "fgh-firefox-skin2.jpg"
    },
    "colors": {
      "frame": "#fdad1a",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Simply orange",
  "manifest_version": 2,
  "description": "Light orange on medium orange persona. Bright, cheerful, and text is  easy to read."
}