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Declined
preview tabs change/lose their order on their own from my dragging into order
I drag my tabs into the order I choose. I pop up the tab menu by hovering over the FF taskbar icon. I find them often lately all scrambled again.
I use MySessions as a FF Add-on. Perhaps this the guilty party?
Customer support service by UserEcho
The order of taskbar thumbnails, if that's what you mean, is not remembered by the tweaker. While 7+ Taskbar Tweaker allows to reorder the thumbnails, it cannot restore that order when Firefox restarts, since the thumbnails are not identifiable in any way. That's something that needs to be handled by Firefox itself in order to work properly and be persistent between different launches of the program.