Either you go the firefox account way (librewolf has it turned off by default but you can turn it back up)
Or you go the manual way. Go to your about:profiles
, open both directory for your profile data, and the folders in the corresponding librewolf folder (that you can check by going in about:profiles
on librewolf).
It’s mostly that Librewolf is a bit like incognito mode by default and it may be confusing for new users.
If you really want to go power mode you can create multiple profiles with different cookie policies. Great to organise yourself and keep cookies where they belong