Examine source code of Nevernore

{
  "theme": {
    "images": {
      "theme_frame": "Nevermorepersona.jpg"
    },
    "colors": {
      "frame": "#c21d1d",
      "tab_background_text": "#301414"
    }
  },
  "version": "2.0",
  "name": "Nevernore",
  "manifest_version": 2,
  "description": "Nevermore logo"
}