firebase.json

{
  "database": {
    "rules": "database.rules.json"
  },
  "hosting": {
    "public": ".",
    "ignore": [
      "firebase.json",
      "database.rules.json",
      "**/.*",
      "**/node_modules/**"
    ],
    "headers": [
      {
        "source": "**",
        "headers": [
          { "key": "X-Content-Type-Options", "value": "nosniff" },
          { "key": "X-Frame-Options", "value": "DENY" },
          { "key": "Referrer-Policy", "value": "strict-origin-when-cross-origin" },
          { "key": "Permissions-Policy", "value": "camera=(), microphone=(), geolocation=()" },
          { "key": "Content-Security-Policy", "value": "default-src 'none'; script-src 'self' https://www.gstatic.com https://*.firebaseio.com; style-src 'self' 'unsafe-inline'; img-src 'self' data:; media-src 'self'; connect-src https://*.firebaseio.com wss://*.firebaseio.com https://*.googleapis.com https://www.gstatic.com; font-src 'self'; frame-ancestors 'none'; base-uri 'self'; form-action 'self'" }
        ]
      },
      {
        "source": "**/*.html",
        "headers": [{ "key": "Cache-Control", "value": "no-store, must-revalidate" }]
      },
      {
        "source": "/",
        "headers": [{ "key": "Cache-Control", "value": "no-store, must-revalidate" }]
      },
      {
        "source": "/index.html",
        "headers": [{ "key": "Cache-Control", "value": "no-store, must-revalidate" }]
      },
      {
        "source": "**/*.js",
        "headers": [{ "key": "Cache-Control", "value": "no-store, must-revalidate" }]
      },
      {
        "source": "**/*.css",
        "headers": [{ "key": "Cache-Control", "value": "no-store, must-revalidate" }]
      },
      {
        "source": "**/*.{jpg,png,mp3}",
        "headers": [{ "key": "Cache-Control", "value": "public, max-age=604800" }]
      }
    ]
  }
}