Examine source code of Ambient Sound Player

{
  "manifest_version": 2,
  "name": "Ambient Sound Player",
  "version": "1.0",
  "description": "Plays ambient sounds or white noise to help users concentrate.",
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Play Ambient Sounds"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ca118818-0c39-4873-8a3c-6debe23ea0ae}"
    }
  }
}