Examine source code of Tor Browser

{
  "name": "Tor Browser",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "wp8514633-tor-browser-wallpapers.png"
    },
    "colors": {
      "frame": "rgba(113, 29, 173, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(59, 59, 59, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(94, 94, 94, 1)",
      "toolbar_field_text": "rgba(214, 214, 214, 1)",
      "tab_line": "rgba(124, 45, 163, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{94a5fe88-5088-44ea-9d91-f3b715b27640}"
    }
  }
}