Examine source code of Cosmo-Witch

{
  "name": "Summer Evening Dress",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "download20220400114731.png"
    },
    "colors": {
      "frame": "rgba(5, 8, 79, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(16, 51, 87, 1)",
      "bookmark_text": "rgba(80, 90, 156, 1)",
      "toolbar_field": "rgba(22, 19, 97, 0.64)",
      "toolbar_field_text": "rgba(82, 96, 130, 1)",
      "tab_line": "rgba(86, 70, 138, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4c468e91-fd50-4711-af71-99bc92cb5d52}"
    }
  }
}