Oversize screen on my monitor

Sometimes the Firefox window size is miscalculated. Normally if you maximize the window, it is fit to the screen, but this only helps if you have a way to maximize the window. On Windows, you can press Alt+Spacebar and then x to do it even if you can't see the title bar buttons. Not sure what options you might have on Linux. Otherwise, you might need to delete a settings file that stores the default window position, '''xulstore.json'''. That is in your currently active profile folder. [[Profiles - Where Firefox stores your bookmarks, passwords and other user data]]