tabs are not saved when chronic/bibliothek is open

I just lost a handfull of open tabs, because i closed firefox, while I
had the chronic open (or library... I do not know the name, I use the
german package, where its called bibliothek). I would have expected it
to ask me weather i wanna save all open tabs, in the same way it does
when the downloads window is open.
i dont know if the same problem exists with the add-on window and
other stuff, or if it is a feature, should it be posted in bugs maybe?