Examine source code of Audio Freeze Frame

{
  "manifest_version": 2,
  "name": "Audio Freeze Frame",
  "version": "1.0.1",
  "description": "Freeze 0.5s of current tab audio and loop it (activated from popup).",
  "permissions": [
    "tabs",
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_title": "Freeze Audio",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "48": "icons/icon48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "audiofreezeframe-b86c789568e9@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}