Examine source code of Winter Frost

{
  "name": "Winter Frost",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(240, 240, 240, 1)",
      "tab_background_text": "rgba(3, 12, 82, 1)",
      "toolbar": "rgba(240, 240, 240, 0)",
      "bookmark_text": "rgba(3, 27, 79, 1)",
      "toolbar_field": "rgba(240, 240, 240, 0.08)",
      "toolbar_field_text": "rgba(3, 14, 82, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5c02831b-04f9-4b9f-a3f3-3fef55608f60}"
    }
  }
}