---
title: "Prevent Firefox DNS Leaks: Complete Setup Guide"
url: "https://astraguardvpn.com/blog/prevent-firefox-dns-leaks-complete-setup"
description: "Complete Firefox setup to prevent DNS leaks with a VPN, including DoH, containers, and tests."
updated: "2026-07-28T00:42:22.512Z"
---

# Prevent Firefox DNS Leaks: Complete Setup Guide

End-to-end Firefox configuration for VPN users who want zero ISP DNS visibility.

End-to-end Firefox configuration for VPN users who want zero ISP DNS visibility. Baseline Update Firefox, disable unused extensions, connect VPN before opening sensitive tabs. DNS settings Settings → Privacy & Security → Enable DNS over HTTPS → Off (strict VPN DNS). Confirm with a leak test. Containers & sync Firefox Multi-Account Containers help separate identities but do not fix network leaks. Firefox Sync can re-link identity across IPs — use deliberately. Verification Run DNS, IP, WebRTC, IPv6 tests. Save screenshots for your own records after major version bumps. Stack with AstraGuard VPN tunnel + Firefox hygiene + kill switch = strong everyday privacy. View plans . Protect yourself with AstraGuard VPN AstraGuard VPN helps keep DNS inside the tunnel with strong encryption, kill switch options, and simple setup on desktop and mobile. Create an account , pick a plan on packages , then verify on privacy tools .

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