Examine source code of Decorating Spring

{
  "name": "Decorating Spring",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "SpringDecorationsH.jpg"
    },
    "colors": {
      "frame": "rgba(162, 204, 84, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(161, 204, 82, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(161, 204, 82, 0.05)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{58403902-1f19-4219-ae61-d4fce79facb0}"
    }
  }
}