Prevent Firefox DNS Leaks: Complete Setup Guide

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 .