I think the problem is caused by an script on Google group site or Google blocked Iran IP and other proxy and VPN IPs for groups.google.com server.
Only Mozilla browser tell this warning and just open head of page. Other browsers show a white page with out anything.
Warning: Unresponsive script
A script on this page may be busy, or it may have stopped responding. You can stop the script now,
or you can continue to see if the script will complete.
Script: https:!fgroups.google.com!foruml#!:121
some sample sites like these.
https://groups.google.com/forum/#!
https://productforums.google.com/forum/#!topic/chrome/tsJ8xciJDws
https://support.google.com/groups/answer/70498?hl=en#survey=true
Excuse me, because of my English isn’t good.
Thanks for your notice.
