Examine source code of belle15

{
  "theme": {
    "images": {
      "theme_frame": "2.jpg"
    },
    "colors": {
      "frame": "#1c1616",
      "tab_background_text": "#0d0c0c"
    }
  },
  "version": "2.0",
  "name": "belle15",
  "manifest_version": 2,
  "description": "belles 15"
}