Examine source code of CMDK - Hotkeys & Snooze in Gmail

{
  "description": "Supercharge Gmail with 25+ hotkeys, natural language snooze, split inbox, read receipts, snippets & toggles to hide Gemini AI.",
  "version": "70.0.3",
  "manifest_version": 3,
  "name": "CMDK - Read Receipts & Hotkeys for Gmail",
  "permissions": [
    "storage",
    "identity",
    "contextMenus",
    "declarativeNetRequestWithHostAccess"
  ],
  "optional_permissions": [
    "notifications"
  ],
  "host_permissions": [
    "*://mail.google.com/*"
  ],
  "optional_host_permissions": [
    "https://*.chromiumapp.org/*",
    "*://*.googleusercontent.com/*"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; frame-src https://affonso.io; connect-src 'self' https://*.firebaseio.com https://*.firebase.googleapis.com https://firestore.googleapis.com https://apis.google.com https://identitytoolkit.googleapis.com https://securetoken.googleapis.com https://www.googleapis.com https://*.cloudfunctions.net https://oauth2.googleapis.com https://api.mixpanel.com https://api-js.mixpanel.com https://decide.mixpanel.com https://accounts.google.com/o/oauth2/revoke"
  },
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "./assets/img/icon-34.png"
  },
  "icons": {
    "128": "assets/img/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://mail.google.com/*"
      ],
      "js": [
        "xhrInterceptor.bundle.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    },
    {
      "matches": [
        "*://mail.google.com/*"
      ],
      "js": [
        "appearanceEarly.bundle.js"
      ],
      "css": [
        "appearance.styles.css"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://mail.google.com/*"
      ],
      "js": [
        "contentScript.bundle.js"
      ],
      "css": [
        "content.styles.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://cmdk.email/installed*",
        "https://cmdk.email/oauth-callback*"
      ],
      "js": [
        "webBridge.bundle.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "assets/img/*",
        "locales/*.json",
        "*.chunk.js"
      ],
      "matches": [
        "*://mail.google.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "hello@cmdk.email",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "personalCommunications",
          "personallyIdentifyingInfo"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  }
}