!!!!! ON FF64+ THE BOOTSTRAP.JS IS CACHED , so on upgrade you should delete the startupcache folder in the ff profile folder or restart twice ! !!!!!
simple session manager for waterfox and firefox quantum / xul /classic addon
you can store manually it also saves your crashes n backups
small editing functions build in
this addon is part of my "tab-trio" of addons which i need for a complete workflow !
i finally upgraded it for use in firefox 100 (actual) ...
please use this userchrome loader for legacy addon support in new firefox versions
https://github.com/xiaoxiaoflood/firefox-scripts
based on this userscript: https://github.com/Endor8/userChrome.js/blob/master/simplesessionmanager/SimpleSessionManager.uc.js or https://forum.mozilla-russia.org/viewtopic.php?id=57048 (i dont know the origin)