06-17-2024 11:47 PM
Sidebar closed after every restart of Firefox 127.0, Windows11.
I have tried a fresh reinstall of firefox without any extension and the problem still exist.
06-21-2024 03:34 AM
06-24-2024 04:27 AM
I have the same issue and I think it's because of a recent update. On my system I've isolated it to a privacy setting, "Never remember history". If I reset to defaults the sidebar open/close state is retained.
Settings > Privacy & Security > History > "Never remember history".