To manage cookies in Firefox:

1. Click the menu button (☰) → Settings → Privacy & Security.
2. Under Cookies and Site Data, choose:
   • Manage Data… to see which sites store cookies and remove them individually.
   • Clear Data… to delete all cookies and cached content.
3. Under Enhanced Tracking Protection, you can select:
   • Standard
   • Strict
   • Custom (for full control over cookies and trackers)