I fixed it by installing a KDE desktop, logging into that once, logging into Gnome again, and rebooting.
Confirmed by rebooting 10 times, and extensions are now persistent.
Somebody with inside knowledge about GDM file permissions should probably be assigned this damn bug.
Edit: It's definitely GDM-related.
I fixed it by installing a KDE desktop, logging into that once, logging into Gnome again, and rebooting.
Confirmed by rebooting 10 times, and extensions are now persistent.
Somebody with inside knowledge about GDM file permissions should probably be assigned this damn bug.