Hello Private Browsing - Use Firefox without saving history https://support.mozilla.org/en-US/kb/private-browsing-use-firefox-without-history <blockquote>Important: When Firefox is set to Always use private browsing mode or to Never remember history, you won't see a purple mask at the top of each window, even though you are in Private Browsing mode. </blockquote For information, Firefox 151.0 https://www.firefox.com/en-US/firefox/151.0/releasenotes <blockquote>Private Browsing Mode now allows you to instantly clear all data from your current session without closing the entire window. When you select the End Private Session button (the fire icon) to the right of the URL bar, Firefox will ask you to confirm to clear your session. Once confirmed, it will wipe all of your private browsing data and open a fresh new Private Browsing Mode session for you. </blockquote> For information https://support.mozilla.org/en-US/questions/1582636 What information is stored in my profile https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data#w_what-information-is-stored-in-my-profile If you whish to try SQLiteStudio, to see (e.g) '''places.sqlite''' https://support.mozilla.org/en-US/questions/1521409 As for me, Firefox is set to, Always use private browsing mode