Cannot login Horizon 7 Administrator Console in Firefox

Since Firefox 60.0 version has been changed default flash execution policy so after upgrade you may be not able to loginĀ  Administrator Console.

The login stucks on login button.

Resolution:

1. Open page about:config

2. find setting dom.ipc.plugins.sandbox-level.flash

3. Set it to 2

Profit! Now you can login into Console.