Examine source code of Background Noise Killer

{
  "manifest_version": 2,
  "name": "Background Noise Killer",
  "version": "1.0",
  "description": "Phát white noise khi phát hiện âm thanh nền không mong muốn.",
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_title": "Background Noise Killer",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{21425829-5ac5-4f51-9fdc-9bcc71a795a4}"
    }
  }
}