Awesome Add-On

[stvnmrks]

Great add-on, exactly what I needed to get my tabs organized for better use.
One question...somehow when I Close Firefox and ReOpen, or Restart and Open Firefox, my Tabs are disappearing and my extensive setup of Tab Groups is gone completely.
I can restore the Tab Groups via File but would rather maintain the groups without doing that each time.
Is there something common that I am overlooking that is possibly causing this?

Thanks,
stvnmrks

[cipri-tom]

did you check the session setting in Firefox ? Preferences > General (tab) > Startup (section) > When Firefox starts (option): "Show your windows and tabs from last time"