Examine source code of Slowverb

{
  "manifest_version": 3,
  "name": "Slowverb",
  "version": "1.1.0",
  "description": "Slowed & Reverb audio effects for browser media",
  "browser_specific_settings": {
    "gecko": {
      "id": "{4c7a71cb-4f77-4535-987c-fa468dd3941f}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/content/content-firefox.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "src/background/background-firefox.js"
    ],
    "type": "module"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "src/worklets/pitch-shifter-processor.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "action": {
    "default_popup": "src/popup/popup.html",
    "default_icon": {
      "16": "assets/icons/icon16.png",
      "48": "assets/icons/icon48.png",
      "128": "assets/icons/icon128.png"
    },
    "default_title": "Slowverb"
  },
  "icons": {
    "16": "assets/icons/icon16.png",
    "48": "assets/icons/icon48.png",
    "128": "assets/icons/icon128.png"
  }
}