Examine source code of Nightmare Cadence

{
  "name": "Nightmare Cadence",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "d663a6207ff578c690a6c0cbbf53786f.png"
    },
    "colors": {
      "frame": "rgba(132, 37, 173, 1)",
      "tab_background_text": "rgba(255, 156, 237, 1)",
      "toolbar": "rgba(255, 243, 135, 1)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(255, 168, 168, 1)",
      "toolbar_field_text": "rgba(86, 41, 112, 1)",
      "tab_line": "rgba(242, 211, 8, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3522d8a5-a0fc-4571-8312-64dc35049d8f}"
    }
  }
}