firebase.json

{
  "firestore": {
    "rules": "firestore.rules"
  },
  "hosting": {
    "public": "dist",
    "ignore": ["firebase.json", "**/.*", "**/node_modules/**"],
    "headers": [
      {
        "source": "**",
        "headers": [
          { "key": "X-Frame-Options", "value": "DENY" },
          { "key": "X-Content-Type-Options", "value": "nosniff" },
          { "key": "Referrer-Policy", "value": "strict-origin-when-cross-origin" },
          {
            "key": "Content-Security-Policy",
            "value": "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; connect-src 'self' https://*.googleapis.com https://*.firebaseio.com https://identitytoolkit.googleapis.com; img-src 'self' data:; font-src 'self'"
          }
        ]
      }
    ],
    "rewrites": [{ "source": "**", "destination": "/index.html" }]
  }
}