Salaam,
Make sure that you have not a proxy set either on your Firefox or
network adapter. It's also possible that a firewall is preventing Zekr
access local content through 127.0.0.1.
What it the value of server.http.address in ~/.zekr/config/zekr.proeprties?
Can you please re-check the scenario with: server.http.address = localhost
Regards,
Mohsen.