My FHD screen is just a touch too small to be comfortable at native resolution, while 1.5x makes things too big. Also, I find Firefox's built-in scaling to be

My FHD screen is just a touch too small to be comfortable at native resolution, while 1.5x makes things too big. Also, I find Firefox's built-in scaling to be much better quality than scaling using Gnome. It could be better exposed; the `layout.css.devPixelsPerPx` property in about:config is what you need to tweak. So I keep Gnome at 1.0x, and Firefox at 1.25x, which as an extra bonus means that "80%" scaling takes Firefox back to native scale again.