-Pentadactyl v1.1 (upd-2014-03-26) -Firefox 28
supposedly qmark is persistent across browser sessions, but not in my case. I'll add a qmark e.g.
:qmark g mail.google.com
upon ff exit the qmark is no longer available.
I had this problem too. It was happening because the directory where quick marks are supposed to be saved didn't exist. To find out where this is on your system run this is pentadactyl command:
Just create this folder and quick marks should become persistent.
For example, on linux