How to keep signed on


I was using Dashlane and they have an option to stay logged on for 14 days. When I open firefox Bitdefender asks me to logon each time I open a new browser even if I check the box keep logged on. But with dashlane you only get asked every 14 days if you choose that option. Can this be duplicated in Password manager or is there a way to do this with the current version?