It's not the first time now that e.g. after a Windows update and a restart of the system, Firefox Portable has automatically opened after reboot. I have checked with Sysinternals Autoruns but could not find any reason for that.
I'm using v.72.0.1 on Win10x64, but it happened with versions before that too.
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Firefox autostarts after reboot
January 15, 2020 - 12:49am
#1
Firefox autostarts after reboot