Examine source code of On The Plains by MaDonna

{
  "name": "On The Plains by MaDonna",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "ThePlainsH.jpg"
    },
    "colors": {
      "frame": "rgba(82, 50, 10, 1)",
      "tab_background_text": "rgba(250, 248, 225, 1)",
      "toolbar": "rgba(84, 53, 10, 0)",
      "bookmark_text": "rgba(250, 248, 225, 1)",
      "toolbar_field": "rgba(84, 53, 10, 0.08)",
      "toolbar_field_text": "rgba(250, 248, 225, 1)",
      "tab_line": "rgba(250, 248, 225, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7b16516d-a0d2-4d92-9720-acfcb9a9c8c4}"
    }
  }
}