I have two monitors: Monitor 1 is Asus PG248QP(Run in 1920 x 1080 360hz landscape 100% scale) Monitor 2 is G272U Pro(Run in 4320 x 2160 60hz landscape 150% scale). I arrange them veritcally, monitor 2 on top and monitor 1 at the bottom. When I minimize the non-fullscreen firefox window on the monitor 1, black/transparent border shows on the left, right, and bottom of the firefox window. When I arrange two monitor horizontally, everything normal. I place monitor 1 at the left of monitor 2. When I do this on the monitor 2, everything normal. I have to use two monitors vertically, since I don't have much space. I also tried different versions of firefox. for now, 129.0 to 136 has these problems. I have install chrome, brave, edge. None of them has this problem. windows 11 23h2 (22631.5039) cpu: 13900k gpu: 4090 with 572.60 ram: 32gb x 2 Firefox 137.0 already tried refresh firefox profile.