Examine source code of RWBY Weiss

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "RWBY Weiss",
  "manifest_version": 2,
  "description": "Based on KurukoKuro's Weiss.Schnee theme, but modified to be more complete and continuous. It also has a proper background added to it rather than a plain white color.\nKurukoKuro's Weiss.Schnee theme can be found here: <a rel=\"nofollow\" href=\"https://addons.mozilla.org/en-US/firefox/addon/weiss-schnee/\">https://addons.mozilla.org/en-US/firefox/addon/weiss-schnee/</a>"
}