firebase

Cache-Control Headers: In Firebase Hosting, you can configure cache-control headers to specify how long browsers should cache your static assets. For images, a long cache duration is typically fine since they don't change often.

Modify firebase.json: This file in your project directory lets you configure how Firebase Hosting serves your files.

{
  "hosting": {
    "public": "public",
    "headers": [
      {
        "source": "/images/**",
        "headers": [
          {
            "key": "Cache-Control",
            "value": "public, max-age=31536000, immutable"
          }
        ]
      }
    ]
  }
}