I am suddenly unable to log in to any websites requiring passwords etc. When I try and enter user names/email addresses/passwords or pin numbers in the required boxes typing produces no response in the boxes. This happens over multiple websites. I have tried the Firefox help advice re cookies, profile files etc. and also uninstalled and reinstalled Firefox. Have also run full Norton security scans and power eraser with no issues detected. None of these have helped and the issue continues. Would be grateful to know if anyone else has had similar issues and/or for any other suggestions to fix this.