Examine source code of Mika Noise

{
  "manifest_version": 3,
  "name": "Mika Noise",
  "version": "1.0",
  "icons": {
    "128": "assets/icon/icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "alarms",
    "offscreen"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "audio.mp3"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "mikanoise@helpme.com",
      "strict_min_version": "58.0"
    }
  }
}