Examine source code of Beautiful Halle

{
  "name": "Beautiful Halle",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "BeautifulHalleH.jpg"
    },
    "colors": {
      "frame": "rgba(230, 243, 250, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(232, 244, 252, 0.09)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(230, 243, 250, 0.05)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{15077987-b831-4d20-93b5-615b08ede06e}"
    }
  }
}