Examine source code of Rain Drop

{
  "name": "Rain Drop",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "RainDropHcopy.jpg"
    },
    "colors": {
      "frame": "rgba(86, 112, 51, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(85, 112, 51, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(87, 115, 53, 0.06)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4ae095e2-871b-4e82-8969-8e7c1d53d3fe}"
    }
  }
}