Examine source code of HubSpot Sales

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "HubSpot Sales",
  "short_name": "HubSpot Sales",
  "description": "Email tracking, CRM for Gmail, and sales productivity tools in your inbox",
  "version": "3.1.1.41716",
  "permissions": [
    "tabs",
    "cookies",
    "storage",
    "background",
    "declarativeNetRequest",
    "alarms",
    "scripting",
    "sidePanel",
    "offscreen"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "optional_permissions": [
    "management"
  ],
  "icons": {
    "16": "img/hubspot-logo-16.png",
    "48": "img/hubspot-logo-48.png",
    "128": "img/logo-128-webstore.png"
  },
  "background": {
    "service_worker": "js/init/Background-sw.js",
    "type": "module"
  },
  "incognito": "not_allowed",
  "action": {
    "default_icon": "img/hubspot-logo-bg-48.png",
    "default_popup": "pages/popup.html"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "js/*.js.map",
        "img/*",
        "pages/*",
        "css/*",
        "js/xhrInterceptor.js",
        "js/calendarXhrInterceptor.js",
        "js/gmailSdk.js",
        "js/setSigExtWindowObject.ts"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "externally_connectable": {
    "matches": [
      "*://*.hubspot.com/*",
      "*://*.hubspotqa.com/*"
    ]
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self';",
    "sandbox": "sandbox allow-scripts allow-forms allow-popups allow-modals; script-src 'self' 'unsafe-inline' 'unsafe-eval'; child-src 'self';"
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "all_frames": false,
      "matches": [
        "*://*.hubspot.com/*",
        "*://*.hubspotqa.com/*"
      ],
      "exclude_matches": [
        "*://*/*.xml"
      ],
      "js": [
        "js/sig-ext.js"
      ]
    },
    {
      "run_at": "document_start",
      "all_frames": false,
      "matches": [
        "*://mail.google.com/mail/*"
      ],
      "js": [
        "js/gmail.js"
      ],
      "css": [
        "css/gmail.css"
      ]
    },
    {
      "run_at": "document_start",
      "all_frames": false,
      "matches": [
        "*://calendar.google.com/*"
      ],
      "js": [
        "js/calendar.js"
      ]
    }
  ]
}