First you need to enable hidden folder view to locate AppData folder as shown in screenshot and from there just follow the marked areas in screenshots. Hope that helps. Regards.

What issue(s) do you have that you want to refresh Firefox ? *https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings See: *https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data *https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode Location used for the main profile that keeps your personal data (Root Directory on about:profiles). *C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles\<profile> See also: *https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile