Examine source code of Heartstopper

{
  "name": "Sin título-1",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Captura de pantalla 2022-10-18 171338.png"
    },
    "colors": {
      "frame": "rgba(104, 109, 120, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(64, 64, 64, 1)",
      "toolbar_field": "rgba(252, 252, 252, 0.51)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{12f0f05a-e03b-41bf-aafb-8fb0a62deb7c}"
    }
  }
}