Examine source code of Audio Voice Recorder

{
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Audio Voice Recorder"
  },
  "description": "Audio Voice Recorder is a free web app that lets you record your voice.",
  "homepage_url": "https://audiovoicerecorder.com",
  "icons": {
    "128": "icon.png"
  },
  "manifest_version": 2,
  "name": "Audio Voice Recorder",
  "version": "1.2",
  "permissions": [
    "tabs"
  ]
}