Examine source code of Wikipedia IPA speech

{
  "manifest_version": 2,
  "name": "IPA speech",
  "version": "1.1",
  "description": "Uses meSpeak.js (GPL v3) to provide client-side IPA text-to-speech for Wikipedia IPA pronunciations",
  "permissions": [],
  "content_scripts": [
    {
      "matches": [
        "https://*.wikipedia.org/wiki/*"
      ],
      "js": [
        "content.js",
        "replacePronLinks.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@wiki-IPA-TY3",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "web_accessible_resources": [
    "mespeak.js",
    "en-us-custom.json",
    "mespeak_config.json"
  ]
}