Examine source code of rainnnnnbow

{
  "theme": {
    "images": {
      "theme_frame": "rainbow_waves-wallpaper-4096x3072lop.jpg"
    },
    "colors": {
      "frame": "#f7f308",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "rainnnnnbow",
  "manifest_version": 2
}