Examine source code of Volume-Control-Level

{
  "manifest_version": 3,
  "name": "Volume Control",
  "version": "1.3.1",
  "description": "Boost and control the volume of any tab from 0% up to 200%.",
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "Volume Control",
    "default_icon": {
      "48": "icons/icon.svg",
      "96": "icons/icon.svg"
    }
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/volume-state.js",
        "src/volume-controller.js",
        "src/scroll-control.js",
        "src/content-script.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "volume-control@personal",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "src/background.js"
    ]
  }
}