Examine source code of Winter Walk

{
  "name": "Winter Walk",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "WinterWalkH4.jpg"
    },
    "colors": {
      "frame": "rgba(121, 146, 179, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(123, 146, 181, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(123, 146, 181, 0.07)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{73ea362d-bc79-48d8-8083-627a3b646c1d}"
    }
  }
}