SOLVED ! here' how :

Files Restored from Time Machine :

~/Library/Group/Containers/U928YCMMNK.com.sweetpproductions.SessionRestore
~/Library/Containers/com.sweetpproductions.SessionRestore
~/Library/Containers/com.sweetpproductions.SessionRestore.extension

(maybe "U928YCMMNK" have to be replaced by your own file's name)

These 3 at the same time, reboot and ...sessions have been restored !
Hope it helps..

Thanks and congrats for your software Russel
Pierre

MacOS 10.14.6

Thanks for your reply, but it didn't work (although i'm sure about restauration date)

Hello,

Thinking to delete tabs with backspace key, this has deleted complete session ! but CMD+Z does nothing ! such a shame ...

is there a way to restore them with TimeMachine (is there a folder or a file somewhere in the system that i could restore) ?

Thanks for your help
Pierre