Such an issue can be caused by the Anti-Keylogger in ZoneAlarm, so you can disable this feature until ZoneAlarm has released an update. *https://www.zonealarm.com/forums/showthread.php/80667-Installation-of-ZA-13-0-208-000-and-now-have-problems-with-Google-Chrome ---- Do you have multiple keyboard layouts installed? It is possible that you have switched the keyboard layout by accident by using the key sequence to rotate the layout. * http://support.microsoft.com/kb/258824 - How to change your keyboard layout Windows remembers the keyboard layout setting per application and you may have changed the keyboard layout by accident via a keyboard shortcut. * http://windows.microsoft.com/en-US/windows7/The-Language-bar-overview The Language bar (overview) * Make sure that you have the Language bar visible on the Windows Taskbar * You can do that via the right-click context menu of the Taskbar: Toolbars > Language Bar * Check the keyboard language (keyboard layout) setting for the application that has focus via the icon on the Language bar * You need to do that while Firefox has focus because Windows remembers the keyboard layout setting per application