Examine source code of Google Color Red

{
  "theme": {
    "images": {
      "theme_frame": "Color_Google_red_header.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Google Color Red",
  "manifest_version": 2,
  "description": "Matches Google's \"Red\" homepage background - Select: \"Change background image\" located at the bottom left of the Google homepage. Choose \"Editor's Picks\" and scroll to the bottom."
}