A fully updated, just built last month, CentOS 7 workstation. The system has 16G of ram, and the real work is done on servers.

I’m seeing a ton of complaints in the logs. Feb 10 18:06:00 gnome-session: (gnome-shell:3248):
mutter-CRITICAL **: meta_window_raise: assertion
‘!window->override_redirect’ failed

I found a bug report from last summer, but as I said, all updates are done.

Also, is there a bug in the firefox package?
Feb 10 17:07:51 : IcedTea-Web java error manual log:
Feb 10 17:07:51 : Application title was not found in manifest. Check with application vendor

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