Examine source code of KnackLabs Sonic

{
  "manifest_version": 3,
  "name": "KnackLabs Sonic",
  "short_name": "Sonic",
  "description": "Modern per-tab Web Audio volume booster with limiter, bass boost, profiles, site overrides, and responsive controls.",
  "version": "4.0.5",
  "action": {
    "default_title": "KnackLabs Sonic",
    "default_popup": "popup/popup.html"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "sw/service_worker.js"
    ],
    "type": "module"
  },
  "permissions": [
    "storage",
    "tabs",
    "scripting",
    "activeTab"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "icons": {
    "16": "assets/icons/16.png",
    "32": "assets/icons/32.png",
    "48": "assets/icons/48.png",
    "96": "assets/icons/96.png",
    "128": "assets/icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "numex-volumeboost@kaloyan.dev",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}