Examine source code of Astonx

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header_LABSxxx.jpg"
    },
    "colors": {
      "frame": "#858fff",
      "tab_background_text": "#0d1eba"
    }
  },
  "version": "2.0",
  "name": "Astonx",
  "manifest_version": 2
}