Examine source code of Simple Back to The Future

{
  "name": "Simple Back to The Future",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "back-to-the-future-car-art.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e4e03bd4-574f-4562-a13a-0acc9fedbf58}"
    }
  }
}