Examine source code of model2

{
  "name": "model2",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "trasparente.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(242, 242, 242, 1)",
      "toolbar": "rgba(26, 22, 22, 1)",
      "bookmark_text": "rgba(232, 238, 240, 1)",
      "toolbar_field": "rgba(59, 40, 50, 1)",
      "toolbar_field_text": "rgba(13, 184, 175, 1)",
      "tab_line": "rgba(42, 92, 191, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{79ce7d1d-3807-4aee-a6d2-c8d00508a189}"
    }
  }
}