Examine source code of Flags by M♥Donna

{
  "name": "Flags by M♥Donna",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Flags (Custom).jpg"
    },
    "colors": {
      "frame": "rgba(5, 27, 79, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(5, 25, 82, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(5, 25, 82, 0.1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3ae3b689-de62-40a2-b240-1e16b6ab6b19}"
    }
  }
}