Examine source code of CESU Sync

{
  "manifest_version": 3,
  "name": "CESU Sync",
  "version": "1.8.6",
  "description": "Synchronise automatiquement les données CESU avec votre système de gestion",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "https://www.cesu.urssaf.fr/*",
    "https://cesu-manager.fr/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.cesu.urssaf.fr/decla/*"
      ],
      "js": [
        "polyfill.js",
        "content-urssaf.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://cesu-manager.fr/*",
        "https://www.cesu.urssaf.fr/*"
      ],
      "js": [
        "polyfill.js",
        "content-bubble.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "polyfill.js",
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "cesu-sync@cesu-manager.fr",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "113.0"
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icons/icon.png"
      ],
      "matches": [
        "https://cesu-manager.fr/*",
        "https://www.cesu.urssaf.fr/*"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'none'; connect-src 'self' https://cesu-manager.fr https://www.cesu.urssaf.fr http: https:;"
  }
}