Examine source code of Caged Hell

{
  "theme": {
    "images": {
      "theme_frame": "CagedHell.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#050202"
    }
  },
  "version": "2.0",
  "name": "Caged Hell",
  "manifest_version": 2,
  "description": "Pentagram and the Number of the Beast are Caged Up or is it we in the cage looking out at the freedom we wish we had."
}