I use 3 monitors and normally I can click on the screen with the Firefox window I want to use, since updating to 148.0 I have to point to the panel and select the mini preview of the window I want to use. I can't seem to minimize firefox windows with the normal minimize button unless I select the window first in the panel/commandbar. I'm not yet sure if this is specific to Youtube windows or all Firefox windows. Anyone else have this problem?
