Nice, comfortable Noté 4 sur 5 étoiles

But I don't know how to save tab configuration. I spent a good piece of time to configure it, but after closing it only one tab in each pane left...

Cette critique est pour une version précédente du module (0.3.3). 

Can not reproduce...

The tab configuration is automatically stored into Firefox's preferences. If you open about:config and search for "firecommander.state", does this value contain your tabs and their state/paths?

What FF version and OS do you use?