Examine source code of A3B Voice

{
  "manifest_version": 2,
  "name": "A3B Voice",
  "version": "2.5.1",
  "description": "Traduce y narra subtítulos de Coursera y DataCamp al español en tiempo real.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "A3B Voice"
  },
  "permissions": [
    "activeTab",
    "storage",
    "alarms",
    "*://*.coursera.org/*",
    "*://*.datacamp.com/*",
    "https://translate.googleapis.com/*",
    "https://api.a3bhub.cloud/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.coursera.org/*",
        "*://*.datacamp.com/*"
      ],
      "js": [
        "compat.js",
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "a3b-voice@a3bcloud",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    },
    "gecko_android": {
      "strict_min_version": "140.0"
    }
  }
}