1. In the Location bar, type about:config and press EnterReturn.
         * The about:config "This might void your warranty!" warning page may appear. Click I'll be careful, I promise!, to continue to the about:config page. 
  2. In the FilterSearch field, type browser.urlbar.autofill.
  3. Double-click the browser.urlbar.autofill preference to set its value to true. 

I followed these instructions for autofill in the address bar: "Filling in automatically while typing a web address If you don't want to select a result in the autocomplete list while you are typing a web address, you can set Firefox to fill in it automatically: 1. In the Location bar, type about:config and press EnterReturn. * The about:config "This might void your warranty!" warning page may appear. Click I'll be careful, I promise!, to continue to the about:config page. 2. In the FilterSearch field, type browser.urlbar.autofill. 3. Double-click the browser.urlbar.autofill preference to set its value to true. Type the first few letters of a web address, it will suggest one web address that matches. Type additional letters until it shows the web address you want and press EnterReturn." It will not autocomplete the web pages I have visited before. What am I missing? Running Mozilla 3.6.3 in Windows 7.