Examine source code of hellokitty rainbow.

{
  "theme": {
    "images": {
      "theme_frame": "hello.JPG"
    },
    "colors": {
      "frame": "#2030c4",
      "tab_background_text": "#2030c4"
    }
  },
  "version": "2.0",
  "name": "hellokitty rainbow.",
  "manifest_version": 2,
  "description": "The HelloKitty Rainbow\n\ncopyright melissaART"
}