Examine source code of Polyglot

{
  "manifest_version": 2,
  "name": "Polyglot",
  "version": "1.0.0",
  "description": "Realtime translation in online chats.",
  "content_scripts": [
    {
      "matches": [
        "*://*.envs.net/*",
        "*://*.whatsapp.com/"
      ],
      "js": [
        "src/content.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "src/popup.html"
  },
  "permissions": [
    "storage",
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "https://api-free.deepl.com/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8f5f8857-5c6e-47a0-9782-d2d586da1902}"
    }
  }
}