After opening a webpage or new tab, the Firefox window cannot be moved or resized. It also cannot be minimized, maximized, or closed using the window controls. These actions work when on the homepage after starting a new Firefox window, but stop working after navigating away from the homepage in any way. Switching or adding tabs still works at all times. The problem persisted after each of the following: disabling all addons, running Firefox in safe mode, restoring Firefox to default settings, and reinstalling Firefox. The problem first appeared shortly after updating Firefox to the new version, but solved itself shortly afterwards. It has now reappeared.