Examine source code of Joyful Christmas

{
  "name": "Joyful Christmas",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Joyful Christmas.png"
    },
    "colors": {
      "frame": "rgba(2, 99, 11, 1)",
      "tab_background_text": "rgba(242, 25, 24, 1)",
      "toolbar": "rgba(242, 25, 24, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(242, 25, 24, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ed58c0f6-3721-47d2-bc1c-927ac79bab1d}"
    }
  }
}