Examine source code of Snowy owl

{
  "theme": {
    "images": {
      "theme_frame": "snowyowl.png"
    },
    "colors": {
      "frame": "#02051f",
      "tab_background_text": "#06032b"
    }
  },
  "version": "2.0",
  "name": "Snowy owl",
  "manifest_version": 2,
  "description": "-"
}