Firefox GTK-Theme Scrollbar no longer works with FF98

After updating from Firefox 97 to 98, i no longer can use my workaround in about:config:

widget.non-native-theme.enabled = false
widget.content.gtk-theme-override = Windows-7-2.1
widget.non-native-theme.scrollbar.size = 24

Windows-7-2.1 is my GTK Theme.

Looks like Mozilla trying to forced me to use the Breeze Scrollbar from KDE in Firefox :face_with_symbols_over_mouth:

Anyone know a solution? I really dislike the Breeze Scrollbar :face_exhaling: