Since months I use your TST, but there is a problem:
When opening a lost session via Tab Session Manager the tab order ist lost.
Does nobody have this same problem ?
Perhaps its only an adjustment.

I did tests now by saving and reopen of a (one) window:
Reopening works fine when active tab is the most right one.
Atherwise only the tabs left to the active one are correct after reopening. The tabs to the right of the active one are reopened in wrong order.
What I think also, saving is not the problem, it's the reopening !
Whould be nice to hear if you found that as i do and more nice if you would correct this issue.

*** an older rating:
It's a must have for me, BUT there is a bug when FF 68.9.0esr crashes:
I had a structure with about 50 tabs. I closed this window, left an other open. The closed window was automatically saved in "Tab Session Manager". Shortly later my Browser crashed. I thought no problem I have saved my important window and structure.
. But NO, after FF restart there are no chronicles within FF and after restore from "Tab Session Manager" the structure was lost.
-> This loss never happens when I closed and restarted FF.

My questions:
-How do I get back my structure ? or
-What must I do that in this situation my structure is automatically restored ?

Hopefully you are able to help !?! (running OS is Windows 8)

NOW I found a solution for me. Perhaps you will correct this once:
I found out that a restore from "TabSessionManager" is mirroring the tab-order.
So when Firefox is crashing and I really have to use a restore from "TabSessionManager", I save again the restored tabs and restore it again.
-> A double-mirroring will bring it in correct order and "TrueStyleTab" brings back my lost style.

Conclusion: I think the fault is in "TabSessionManager" not in "TrueStyleTab"