Examine source code of Horses Galore by MaDonna

{
  "name": "Horses Galore by MaDonna",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "Horses1.jpg"
    },
    "colors": {
      "frame": "rgba(204, 196, 196, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(204, 196, 196, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(204, 196, 196, 0.05)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e39c5e50-c15d-478a-b75b-4afbd1c33c78}"
    }
  }
}