Examine source code of Crimson Playground

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "#7a0000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Crimson Playground",
  "manifest_version": 2,
  "description": "Inspired by Wallpaper 59 (which has the same design). This design is less colorful that the other browser themes,\nfor the purpose of making it easier to navigate your web browser."
}