privsec.dev/firebase.json

{
  "hosting": {
    "public": "public",
    "headers": [ 
      {
        "source": "*",
        "headers": [
          {
            "key": "Content-Security-Policy",
            "value": "upgrade-insecure-requests; block-all-mixed-content; form-action 'none'; frame-ancestors 'self'"
          },
          {
            "key": "X-Content-Type-Options",
            "value": "nosniff"
          },    
          {
            "key": "Referrer-Policy",
            "value": "no-referrer"
          },   
          {
            "key": "Cross-Origin-Opener-Policy",
            "value": "same-origin"
          },   
          {
            "key": "Cross-Origin-Embedder-Policy",
            "value": "require-corp"
          },   
          {
            "key": "X-Frame-Options",
            "value": "DENY"
          },  
          {
            "key": "X-XSS-Protection",
            "value": "0"
          },  
          {
            "key": "Permissions-Policy",
            "value": "accelerometer=(), ambient-light-sensor=(), autoplay=(), battery=(), camera=(), clipboard-read=(), clipboard-write=(), display-capture=(), document-domain=(), encrypted-media=(), fullscreen=(), geolocation=(), gyroscope=(), hid=(), idle-detection=(), interest-cohort=(), magnetometer=(), microphone=(), midi=(), payment=(), picture-in-picture=(), publickey-credentials-get=(), screen-wake-lock=(), serial=(), sync-xhr=(), usb=(), xr-spatial-tracking=()"
          },  
          {
            "key": "Cross-Origin-Resource-Policy",
            "value": "same-origin"
          },
          {
            "key": "Expect-CT",
            "value": "enforce, max-age=63072000"
          }
        ]
      }    
     ],
    "ignore": [
      "firebase.json",
      "**/.*",
      "**/node_modules/**"
    ]
  }
}