Hello, If you check to Firefox always start in Private Browsing you won't see difference in the Appearance of Firefox. See here how to start a private browsing: *[https://support.mozilla.org/en-US/kb/private-browsing-browse-web-without-saving-info Private Browsing] If you want to start a private tab: *[https://addons.mozilla.org/pt-BR/firefox/addon/private-tab/?src=search Private Tab] If you want always start in private browsing go to '''Tools'''>> '''Options''' >> '''Privacy''' >> '''Firefox will:''' change to '''Never remember history''' *[https://support.mozilla.org/en-US/kb/settings-privacy-browsing-history-do-not-track#w_never-remember-history Never remember history]

See also: *https://developer.mozilla.org/Command_Line_Options