Examine source code of Speech Recognition Polyfill (Voice-to-Text)

{
  "manifest_version": 2,
  "default_locale": "en",
  "name": "__MSG_ext_name__",
  "version": "1.6.6",
  "description": "__MSG_ext_desc__",
  "permissions": [
    "<all_urls>",
    "storage",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@firefox-speech-polyfill",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_security_policy": "script-src 'unsafe-eval' 'self' blob: https://cdn.jsdelivr.net https://esm.run; connect-src 'self' data: blob: https://cdn.jsdelivr.net https://esm.run https://ccoreilly.github.io https://alphacephei.com https://api.assemblyai.com https://streaming.assemblyai.com wss://streaming.assemblyai.com https://huggingface.co https://cdn.huggingface.co https://*.hf.co https://*.s3.amazonaws.com https://*.googleapis.com https://embeddedassistant-frontend-clients6.youtube.com https://www.google.com https://addons.mozilla.org; object-src 'self'",
  "icons": {
    "16": "images/microphone.svg",
    "32": "images/microphone.svg",
    "48": "images/microphone.svg",
    "128": "images/microphone.svg"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": "images/microphone.svg",
    "default_popup": "popup.html",
    "default_title": "__MSG_browser_action_title__"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "polyfill.js",
    "asr-worker.js",
    "parakeet-config.js",
    "parakeet-worker.js",
    "parakeet-engine/parakeet-worker.js",
    "parakeet-engine/chunks/*",
    "parakeet-engine/assets/*",
    "parakeet-engine/wasm/*",
    "google/protobuf.js",
    "google/webchannel.js",
    "google/fullduplex.js",
    "google/bridge.js"
  ]
}