Examine source code of MaDonnas Black Gradient

{
  "theme": {
    "images": {
      "theme_frame": "BlackGradientH.jpg"
    },
    "colors": {
      "frame": "#4f4d4d",
      "tab_background_text": "#f7f2f2"
    }
  },
  "version": "2.0",
  "name": "MaDonnas Black Gradient",
  "manifest_version": 2,
  "description": "black, gray, easy read browser, gradient, faded\n\nDesigned by MaDonna"
}