The problem may be with IPv6 ("Internet Protocol version 6"). To disable IPv6, change the preference network.dns.disableIPv6 from "false" to "true" . Here are the steps:
1. Type about:config in the address bar, press Enter.
2. Find network.dns.disableIPv6 in the list.
3. Right-click -> Toggle.
4. Restart Firefox/Mozilla Suite and try again.
If this doesn't work, re-enable IPv6 by resetting the preference to "false".
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