Examine source code of Winter Sunshine

{
  "name": "Winter  Sunshine",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(186, 206, 219, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(186, 205, 219, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(186, 205, 219, 0.05)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(4, 21, 54, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bb353c52-0340-4afe-a5b5-ac7b0981ba9d}"
    }
  }
}