I am using librewolf for browsing (its a firefox fork with enhanced privacy built in).
Librewolf got an update and it showed me this message.
Since I have a new profile I am not able to see my bookmarks. I can not import them since I do not have backed them up. They are just lying in the other profile unaccesable by me.
Any clues how to get it work? Maybe install a older version, backing up the bookmarks and than use the new one?
Ok I tried to find a solution and found one.
First look at the profiles you have on librewolf (URL: about:profiles).
You will see different profiles and one of those can not be opened.
BUT in the directory where the files are you will find two files that contain bookmarks + their favicons.
You will find them in:
.var > app > io.gitlab.librewolf > .librewolf > chose folder of old profile
Copy places.sqlite + favicons.sqlite and replace them in the directory of the new profile.
Restart & enjoy! 
Sources:
https://support.mozilla.org/en-US/questions/1097939
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