Examine source code of Christmas Kittens

{
  "name": "Christmas Kittens",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "ChristmasCatsh.jpg"
    },
    "colors": {
      "frame": "rgba(199, 213, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(202, 215, 235, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(226, 233, 245, 0.09)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(252, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8266a496-3129-419d-bb40-864775572439}"
    }
  }
}