Examine source code of fox and rainbow

{
  "theme": {
    "images": {
      "theme_frame": "foxrainbowanimation.PNG"
    },
    "colors": {
      "frame": "#e4fad7",
      "tab_background_text": "#292929"
    }
  },
  "version": "2.0",
  "name": "fox and rainbow",
  "manifest_version": 2,
  "description": "without background "
}