I am using Widows7 Home Premium with Yahoo Mail and Firefox, a combination that's worked for years. When starting an email and when you put the first letter in the 'To' line I used to get a box suggesting all the names in my contact list beginning with the same letter. With a simple click on the name you want, it appears on the 'To' line. This is not now happening and it's a pain having to dig out email addresses from elsewhere. I have not made any alterations anywhere on the computer, it just disappeared one day. How can I get this feature to reappear?