I am experiencing an issue where Google.com (other google domains work fine) will not load in Firefox, resulting in an infinite loading loop. Other browsers on the same system (Brave) work fine. Here are the steps I have already tried: Reinstalled Firefox completely Removed Firefox via sudo apt remove --purge firefox -y Cleared all user profiles and caches: ~/.mozilla/firefox, ~/.cache/mozilla, ~/.config/Mozilla Reinstalled via Flatpak Tested network connectivity outside Firefox curl google.com works correctly DNS resolution works via getent hosts google.com in the host system Checked proxy settings Ensured “No proxy” is selected in Firefox → did not resolve the issue Tested in Safe Mode (disabling extensions) Problem persists, so not caused by extensions Tried disabling IPv6 inside Firefox network.dns.disableIPv6 set to true → no effect Cleared DNS cache inside Firefox about:networking#dns → clicked “Clear DNS Cache” → no effect Disabled DNS-over-HTTPS (Secure DNS) about:preferences#privacy → “Use secure DNS” → disabled → no effect Disabled HTTP/3 (QUIC) network.http.http3.enabled set to false → no effect Verified Flatpak network permissions flatpak info --show-permissions org.mozilla.firefox shows network access allowed Inside the Flatpak shell: flatpak run --command=sh org.mozilla.firefox getent hosts google.com → returns only IPv6 address: 2800:3f0:4001:839::200e google.com