Examine source code of Colors Universe

{
  "name": "Colors Universe",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "8971-kawaii Firefox.jpg"
    },
    "colors": {
      "frame": "rgba(29, 93, 222, 0)",
      "tab_background_text": "rgba(249, 255, 125, 1)",
      "toolbar": "rgba(237, 55, 55, 0)",
      "bookmark_text": "rgba(249, 255, 130, 1)",
      "toolbar_field": "rgba(222, 56, 56, 0)",
      "toolbar_field_text": "rgba(245, 255, 138, 1)"
    }
  }
}