Thunderbird on my wife's windows 10 pc opens but hangs trying to communicate with ATT/Yahoo server. When none of the obvious troubleshooting steps helped, I thought the Profile might be corrupted. I recovered only the 2 day-old Profile folder from my Retrospect backup set, renamed the current Profile folder, and pasted the older Profile in its place. Thunderbird then started, logged into the server, and downloaded emails. However, nothing about Firefox looked familiar - no the local options/folders, etc. were there. How do I get the original Thunderbird look and feel back for her (very important)?