Hello Private Browsing - Use Firefox without saving history. https://support.mozilla.org/en-US/kb/private-browsing-use-firefox-without-history 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 You can use, SQLiteStudio, if you wish. By way of illustration https://support.mozilla.org/en-US/questions/1521409 Others indicators https://support.mozilla.org/en-US/questions/1535029, if you use private window, https://support.mozilla.org/en-US/questions/1550484