Is there a setting for a masterpassword for the passwordmanager

When using the passwordmanager to save logins everybody can just access any saved sites or is it possible to set something like a masterpassword for the passwordmanager so that people can use the computer but not login to websites?

The setting here is a workstation where several people work (the station is connected to different machines like printers and lasers) but only specific people should be able to access websites with login; right now the passwordmanager asks for the windows password, which is no help here of course.