Examine source code of Ibex Twilight

{
  "theme": {
    "images": {
      "theme_frame": "ibexpersona.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#053960"
    }
  },
  "version": "2.0",
  "name": "Ibex Twilight",
  "manifest_version": 2,
  "description": "Ibex silhouettes. I do not claim ownership of any of these images."
}