Examine source code of ReplyDrafter

{
  "manifest_version": 3,
  "name": "ReplyDrafter",
  "version": "1.0",
  "description": "Draft replies instantly using your custom knowledge base.",
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "https://mail.google.com/*",
    "https://api.replydrafter.com/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "128": "icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*"
      ],
      "js": [
        "purify.min.js",
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "support@replydrafter.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "personallyIdentifyingInfo"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "128": "icon128.png"
  }
}