As we all know the fullscreen mode does exactly what you'd expect, it makes Firefox cover the entire screen, including the taskbar. That's great. However sometimes I'm running more than one window of Firefox and if only one of the windows is in fullscreen it will cover the taskbar even when I alt-tab to any of the windows that aren't in the fullscreen. I'll provide a screenshot to show my case. And as you'll be able to see if I mouse-over links in the taskbar they're clickable, so the fullscreen window is still active through the area where taskbar should be once you're running a window that isn't in fullscreen. That's quite annoying and gets in the way so I'm wondering is that an oversight or a bug (I hope it's not an intended feature) and is there a way to fix that in config or will I have to wait for the developers to fix this in a patch eventually, if they would even want to.