Examine source code of Make it louder!

{
  "manifest_version": 3,
  "name": "Make it louder!",
  "description": "Amplify per-tab audio up to 500%. Privacy-first, stateless, lightweight.",
  "version": "2.0.3",
  "icons": {
    "16": "icon.svg",
    "32": "icon.svg",
    "48": "icon.svg",
    "96": "icon.svg",
    "128": "icon.svg"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "make-it-louder@extension.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Make it louder!",
    "default_popup": "popup.html"
  },
  "content_scripts": [],
  "host_permissions": [
    "<all_urls>"
  ]
}