Examine source code of UNCLE is watching

{
  "theme": {
    "images": {
      "theme_frame": "Peeking.jpg"
    },
    "colors": {
      "frame": "#5e7e7e",
      "tab_background_text": "#d8d8d8"
    }
  },
  "version": "2.0",
  "name": "UNCLE is watching",
  "manifest_version": 2,
  "description": "Napoleon Solo (Robert Vaughn) and Illya Kuryakin (David McCallum) are agents from U.N.C.L.E."
}