Examine source code of Ambient Tab Sounds

{
  "manifest_version": 2,
  "name": "Ambient Tab Sounds",
  "version": "1.0",
  "description": "Plays ambient sounds like rain or stream in empty or idle tabs to help focus.",
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icons/icon48.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/icon48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bcfecb9b-ae04-47c0-a399-3080bb2ed19d}"
    }
  }
}