Icon flashes once and then stays greyed out. So I uninstalled and then reinstalled, same thing. So I installed the beta version, same thing.
Enable Native Messaging for Firefox was checked for all scenarios.
Same thing is also happening with Edge.
1Password Version: 7.0.519
Extension Version: 184.108.40.206
OS Version: Win 10 v1709 b16299.192
Sync Type: 1Password for Families