Suddenly Firefox-ESR and Iceweasel can not lookup DNS but /etc/hosts works fine. Other programs does also work fine: konqueror, wget and curl.I have gone through http://mzl.la/1xKrMnN Firefox can't load websites but other browsers can, no firewalls prevent Firefox from DNS, IPv6 disabled, no proxy and no DNS prefetching.$ egrep network.dns.dis|proxy ~/.mozilla/firefox/*.default/prefs.js user_pref(network.dns.disableIPv6, true);user_pref(network.dns.disablePrefetch, true);user_pref(network.proxy.type, 0);I have tried reboot, reinstall, purge & install. Login as a new defined user does not work either. Then:mkdir debug ; cd debugstrace -o f -ff firefox http://example.org/grep -rn example.org f*and to have something to compare withstrace -o k -ff konqueror http://example.org/grep -rn example.org k*I have gone through the files but have not found any smoking gun yet. Where to go from now? Reinstall the computer?
How to debug: Firefox can not lookup DNS
dns;firefox