Examine source code of Snow Covered

{
  "name": "Snow Covered",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "SnowCoverH2.jpg"
    },
    "colors": {
      "frame": "rgba(176, 179, 196, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(179, 181, 199, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(179, 181, 199, 0.14)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{07461d24-0614-448a-bd0a-9dd94132e12e}"
    }
  }
}