Examine source code of Volume Booster 0-600

{
  "manifest_version": 3,
  "name": "Volume Booster",
  "version": "1.0.0",
  "description": "Boost the volume of any tab past 100% with a simple slider. Works on video and audio on any site.",
  "author": "90.Sr",
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "action": {
    "default_title": "Volume Booster",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{cf95a68e-91f8-4ac3-ad5f-84b7a89798c2}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}