Hello Private Browsing - Use Firefox without saving history. https://support.mozilla.org/en-US/kb/private-browsing-use-firefox-without-history To see, a trick to find out if you're use private window. Type, '''about:cache''', in the address bar. Click on List Cache Entries, you'll find information privateBrowsingId. Other indicator, to see, if you use private window. 1 - Go to Configuration Editor for Firefox https://support.mozilla.org/en-US/kb/about-config-editor-firefox 2 - Enter a search term '''browser.privatebrowsing.resetPBM.enabled''', value false (by defaut), you can try''' true'''.