Examine source code of Radioactive

{
  "theme": {
    "images": {
      "theme_frame": "Untitled.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#008a02"
    }
  },
  "version": "2.0",
  "name": "Radioactive",
  "manifest_version": 2,
  "description": "The art was made by Teundenouden.\n\nRadioactive, nothing more to say..."
}