Hi! This is an old question, but now over the time i can be more specific with this problem. What i know now in windows 10: - with firefox ESR sandboxie works fine all the time (now I use v 115.8.0); - with current firefox (v123) what happens is, after install current version, every time i open firefox, it works fine, but if i select "pause forcing programs", to change something in firefox, this means open firefox without sandboxie, now the first time i open firefox again sandboxie, it´s freeze, and can´t use for this moment now firefox sandboxie. Only works without sandboxie. Thanks in advance.