Examine source code of aperturelaboratories-

{
  "theme": {
    "images": {
      "theme_frame": "aperture.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "aperturelaboratories-",
  "manifest_version": 2,
  "description": "\"Aperture Science\" persona for the popular video-game Portal. Aperture Science and Companion Cube is owned by Valve. Made in GIMP 2.6."
}