Examine source code of Pitch Shifter lol

{
  "manifest_version": 2,
  "name": "Pitch Shifter lol",
  "version": "2.4",
  "description": "High-Quality pitch-shifting of any tab in real-time using signalsmith stretch. Use it on YouTube, Karaoke sites, whatever.",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "pitchshifter-lol@example.com",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "content_security_policy": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'",
  "web_accessible_resources": [
    "stretch.wasm",
    "processor.js",
    "stretch.js"
  ]
}