Hello, I've been using FF and Outlook.com email service for many years without any problems. However something strange happened recently - after some update, I guess. It is not possible to write one polish special character during composing an email - letter ż . To input such character polish users have keyboard settings which allow to press 'ALT + z'. And since a few weeks ALT+z acts like CTRL+z , which results deleting last letter (undo last action), instead of typing letter ż. Some investigations: - This problem occurs only in an email body textbox. In a subject field it is ok. - Tried to disable all add-ons - does not help. - Tested in other browsers - the problem does not exist in Chrome or IE. Is this some Firefox bug? If there are some polish users of FF and Microsoft's email service - could you please check if you face the same problem? Thanks in advance for help.