Works well with a shortkey to copy and paste a login, but does not have an integration into firefox. therefore it is less convenient, but probably more secure than keepass2 = keefox:

This is a c# mono implementation. a firefox plugin exists and once it is setup, the integration works very well.

Follow this guide and use the additional repositories for an easy setup. otherwise expect version conflicts between keepass2 and the KeePassRPC.plgx plugin:

https://github.com/kee-org/KeeFox/wiki/en-%7C-Installation-%7C-Linux#install-additional-plugin-dependencies-ubuntu-1604-only