Examine source code of Starlight Journey

{
  "name": "Starlight Journey",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "StarlightJourney (1).png"
    },
    "colors": {
      "frame": "rgba(10, 19, 43, 1)",
      "tab_background_text": "rgba(230, 240, 255, 1)",
      "toolbar": "rgba(30, 58, 138, 1)",
      "bookmark_text": "rgba(207, 227, 255, 1)",
      "toolbar_field": "rgba(15, 42, 86, 1)",
      "toolbar_field_text": "rgba(248, 250, 252, 1)",
      "tab_line": "rgba(255, 209, 102, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{421e171c-e6a6-4ba9-942c-58dd16d170ce}"
    }
  }
}