Kee doesn't work, just showing "OFF" logo

Kee doesn’t work, just showing “OFF” logo and message “You are not logged in to your password database”, but I am logged. KeePass enabled, connection between keepass and kee established.
Windows 10
KeePass: 2.37
Firefox: 57.0 (64 bit)

2 posts were merged into an existing topic: Kee (pass) is showing big red OFF logo and I cannot open it