Examine source code of Calm Cafe Sounds

{
  "manifest_version": 2,
  "name": "Calm Cafe Sounds",
  "author": "Tsu-Hao Liu",
  "homepage_url": "https://github.com/Tsu-HaoLiu/Calm-Cafe",
  "version": "2023.7.2",
  "description": "Listen to ambient background sounds while studying or doing focus work.",
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Calm Café Sounds",
    "default_icon": {
      "192": "assets/icon192.svg",
      "256": "assets/icon256.svg"
    }
  },
  "background": {
    "scripts": [
      "./background.js"
    ]
  },
  "permissions": [
    "storage"
  ],
  "icons": {
    "192": "assets/icon192.svg",
    "256": "assets/icon256.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0e3f4a63-6d04-43cf-84ba-ad56ecef28a4}"
    }
  }
}