Examine source code of hello world

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manifest.json

{
  "name": " hello world",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "helloworld.png"
    },
    "colors": {
      "toolbar": "rgba(31, 32, 41, 1)",
      "toolbar_field": "rgba(67, 69, 92, 1)",
      "toolbar_field_text": "rgba(153, 155, 176, 1)",
      "frame": "rgba(44, 46, 63, 1)",
      "tab_background_text": "rgba(153, 155, 176, 1)",
      "bookmark_text": "rgba(153, 155, 176, 1)"
    }
  }
}

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