Examine source code of concac

{
  "theme": {
    "images": {
      "theme_frame": "Devkit_By_Bartelme_2560X1600.jpg"
    },
    "colors": {
      "frame": "#453a3a",
      "tab_background_text": "#cf5555"
    }
  },
  "version": "2.0",
  "name": "concac",
  "manifest_version": 2,
  "description": "demo"
}