Examine source code of Alfheim

{
  "name": "Alfheim",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "back.png"
    },
    "colors": {
      "frame": "rgba(23, 21, 41, 1)",
      "tab_background_text": "rgba(230, 244, 241, 1)",
      "toolbar": "rgba(23, 21, 41, 1)",
      "bookmark_text": "rgba(230, 244, 241, 1)",
      "toolbar_field": "rgba(34, 32, 52, 1)",
      "toolbar_field_text": "rgba(230, 244, 241, 1)",
      "tab_line": "rgba(139, 88, 197, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b25f6a10-67c1-4046-ad81-9b45e0e2290c}"
    }
  }
}