Examine source code of Green Loading Symbol

{
  "theme": {
    "images": {
      "theme_frame": "green.png"
    },
    "colors": {
      "frame": "#383838",
      "tab_background_text": "#54ff5f"
    }
  },
  "version": "2.0",
  "name": "Green Loading Symbol",
  "manifest_version": 2,
  "description": "an animated green symbol that is basically a loading symbol"
}