Examine source code of Christmas Blues

{
  "name": "Christmas  Blues",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "bluesxmasH.jpg"
    },
    "colors": {
      "frame": "rgba(212, 240, 252, 1)",
      "tab_background_text": "rgba(39, 45, 112, 1)",
      "toolbar": "rgba(214, 241, 255, 0)",
      "bookmark_text": "rgba(45, 51, 117, 1)",
      "toolbar_field": "rgba(214, 241, 255, 0.07)",
      "toolbar_field_text": "rgba(5, 20, 130, 1)",
      "tab_line": "rgba(5, 20, 130, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c6a2f077-39d4-4d07-b0b3-3f23270f26de}"
    }
  }
}