Examine source code of Night cat

{
  "theme": {
    "images": {
      "theme_frame": "nightcat.jpg"
    },
    "colors": {
      "frame": "#c48be0",
      "tab_background_text": "#ca93ed"
    }
  },
  "version": "2.0",
  "name": "Night cat",
  "manifest_version": 2
}