Examine source code of Arcturus

{
  "theme": {
    "images": {
      "theme_frame": "Arcturus_Header.jpg"
    },
    "colors": {
      "frame": "#757575",
      "tab_background_text": "#e87510"
    }
  },
  "version": "2.0",
  "name": "Arcturus",
  "manifest_version": 2,
  "description": "A persona I made in tribute to my favorite band Arcturus."
}