Examine source code of Hello World

{
  "name": "Hello World",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Hello World.png"
    },
    "colors": {
      "frame": "rgba(14, 99, 55, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(0, 0, 0, 1)",
      "bookmark_text": "rgba(67, 163, 75, 1)",
      "toolbar_field": "rgba(42, 235, 184, 0.43)",
      "toolbar_field_text": "rgba(147, 184, 163, 1)"
    }
  }
}