Examine source code of Not Just a Pretty Face

{
  "name": "Not Just a Pretty Face",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "H.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  }
}