Examine source code of swirled

{
  "theme": {
    "images": {
      "theme_frame": "swirl.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#e8e8e8"
    }
  },
  "version": "2.0",
  "name": "swirled",
  "manifest_version": 2,
  "description": "just want something for my own use, created by me, looking how i want it."
}