Hello those wiser than me, When my Firefox 110 goes inactive by clicking elsewhere, the only change is that selected elements temporarily de-select and the scrollbar thumb turns color to one almost the same as the track, making it nearly invisible. Is there any way to keep it the same (much darker grey) when it is not the active window with the focus? There are a few themes that don't exhibit this behavior, but I could not find a dark one. My search on the subject yields only webpage design talk or obsolete pre v78 add-ons.

I'm on Linux Mint 20.3 Cinnamon with FF's built-in dark system theme. Thanks in advance.