Stick to a single string of text with five letters. Head to the Users folder in Windows Explorer. Find the folder with the old username and rename it to the same name as you did in the previous step.

User profile folders on Windows 10 or 11 are important directories that store personal files, app settings, and system ...

its folder would have “default” in the name. You can have multiple Firefox profiles, each containing a separate set of user information. Alternatively, you can find your profile by pressing ...