The position of the Firefox window is not restored correctly after clicking maximize then unmaximize (aka restore). This is not a new problem. I think has always occurred on this machine (about a year old, Linux, Mint 19, Cinnamon). It only happens if the window is touching the top edge (or corner) of the desktop. The unmaximized window is shifted down and to the right of the original position. The window features (buttons, menus, etc) seem to return to their original positions, but the displayed window is shifted. For example, if I try to click the maximize button again, the mouse pointer needs to be above and left of the visible button. I have turned off Linux desktop features, including window tiling and snapping, edge resistance, and some others, but I see no change. I also tried the monitor resolution and different desktop themes. If this is not a bug, I am hoping I can disable something so that the window returns to its original position after it is unmaximized. For example, the height of the top border decreases when the window is maximized and increases when unmaximized, so if this is causing the issue, I am happy to disable it. In the attached images, the top right of the image is the top right of the desktop. The first image shows Firefox in the top right corner before maximizing the window, and the second image shows the shifted position after unmaximizing the window. The expected behavior is for the window to return to the original position as shown in the first image. Thanks for any help.