Examine source code of Dollar bills

{
  "name": "Dollar bills",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "dollars-2.png"
    },
    "colors": {
      "frame": "rgba(41, 133, 44, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(77, 92, 41, 0.68)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(161, 145, 2, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{73eb7b30-8631-4fb7-81a9-3a3b8841f42f}"
    }
  }
}