Examine source code of BasementHackerOS

{
  "name": "BasementHackerOS",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "black.jpg"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(34, 255, 0, 1)",
      "toolbar": "rgba(0, 0, 0, 1)",
      "bookmark_text": "rgba(255, 0, 0, 1)",
      "toolbar_field": "rgba(9, 36, 4, 1)",
      "toolbar_field_text": "rgba(34, 255, 0, 1)",
      "tab_line": "rgba(255, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d47a746b-e6b5-4a75-8c95-1544cd61a4f9}"
    }
  }
}