What do you mean by Guest Mode ?

Dear Mr FredMcD; Had I knowing that,I would NOT have had asked this question,in the First Place. I hope,you will agree !!

Hello! Excuse me. I don't know what "Guest Mode" is. Firefox has a "Private Window" though and that's all i know.

Hi Firefox doesn't have a specific guest mode that automatically creates a new profile and removes this profile when you are done. You can possibly use a separate profile and use "Clear history when Firefox closes" to clear all session data or use Private Browsing mode, but this isn't perfect and you would have to run a Windows script to remove all files in this profile in both AppData\Roaming and AppData\Local to cleanup any leftovers from using "Clear history when Firefox closes". See "Creating a profile": *https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles You can use a desktop shortcut that specifies the profile or use a Windows guest account if this is about your own device. *https://developer.mozilla.org/en-US/Command_Line_Options See also: *https://support.mozilla.org/en-US/kb/private-browsing-use-firefox-without-history *https://support.mozilla.org/en-US/kb/common-myths-about-private-browsing ---- Firefox uses two locations for the Firefox profile folder 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> Location used for the disk cache and other temporary files (Local Directory on about:profiles). *C:\Users\<user>\AppData\Local\Mozilla\Firefox\Profiles\<profile>