Tabs ungrouped and got loose everywhere, when Firefox restart. I guess it'll never work if it does not have Session Manager intergrated. I thought I found better replacement for Tree Style Tabs, but no, just the same.
I'm sorry to hear that. I need some info to dig what happened and fix the problem. First I need a list of your installed and enabled extensions, second will be, steps to reproduce the mess... best regards and thanks.
