Examine source code of Quiet-Scroll

{
  "manifest_version": 2,
  "name": "Quiet-Scroll",
  "version": "1.0",
  "description": "Reduce volume temporarily while scrolling (auto -10% to -20%).",
  "permissions": [
    "tabs",
    "activeTab",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "quietscroll-8d7f8789@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}