Examine source code of Dark Cerulean

{
  "name": "Dark Cerulean",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Screenshot 2022-07-01 152426.png"
    },
    "colors": {
      "frame": "rgba(5, 5, 5, 1)",
      "tab_background_text": "rgba(27, 154, 170, 1)",
      "toolbar": "rgba(27, 154, 170, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(221, 219, 203, 1)",
      "toolbar_field_text": "rgba(5, 5, 5, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bcb4c7a2-ccaa-4b44-83b1-f5c9ac2c75fc}"
    }
  }
}