Examine source code of Writingmate

{
  "name": "Writingmate",
  "version": "2.7.1",
  "manifest_version": 2,
  "description": "Writingmate: GPT-4 for Docs, Sheets, Slides",
  "default_locale": "en",
  "permissions": [
    "storage",
    "identity",
    "activeTab",
    "<all_urls>"
  ],
  "browser_action": {
    "default_title": "Writingmate.ai",
    "default_icon": "icons/icon96.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "web_accessible_resources": [
    "images/*",
    "icons/*",
    "index.html",
    "chat.html"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+M"
      },
      "description": "Open Writingmate"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://mail.google.com/mail/*"
      ],
      "js": [
        "gmail.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle",
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon96.png",
    "48": "icons/icon96.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEApIgUg3aMt1X8a9wfKOnoAFMlujSaDRNksLx9v/Ltva/detO2uLzLCaVIkxHfNwlK1G/76IivMbbH7Q9rFNuj8GXu+i9ktXV9MaUYW9iB9gaWhrnKBCCLRUJX8nCi10NKjotVD8sHVbd2xOi6XvUIwC5rAkH37HUB31Mny2MmomdF1kdek/3onBtydacJn9hcngKKY4naYi22NqJcdF4nz8iQ4TLMGuSkBcGxg2Rd386MvRCNTUSj+/4KDIeZvhnhE+nmduYASAT1HW5C9KPOpa3Af4jBi1x3VtbwwJK5dK+ArXujgZN4YzweUH3KTpKw0EnVBqvd/svlpCi/fYXSCwIDAQAB",
  "oauth2": {
    "client_id": "414834096175-b69c2u4073crujk4mnme44a027rgpvse.apps.googleusercontent.com",
    "scopes": [
      "profile email",
      "https://www.googleapis.com/auth/drive.file"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cd6aca99-2a9f-40dd-b623-055293171012}"
    }
  }
}