Sorry, the Mozilla developers didn't include a switch to turn Private Browsing off. Any hack that I have seen posted would affect the main security file and possibly cause a security risk (advice provided by a Mozilla developer). There is a Bug filed to disable Firefox's Private Browsing mode when Windows Vista and Win 7 Parental Controls are enabled. I made a comment in that Bug in Oct 2009 and provided a list of threads (in Dec 2009) from this support forum that discussed the requests from parents for either a switch to turn the feature off or compatibility with Windows Parental Control, The final result of that effort was a comment about the (small - "two per week") number of threads where this topic was discussed. There haven't been any comments or any progress made since last April toward fixing that Bug. ''Please note that not every Bug is a fault with Firefox, a good number of Bugs are requests for enhancement of existing features or for adding new features.'' <br /> https://bugzilla.mozilla.org/show_bug.cgi?id=471658 <br /> https://bugzilla.mozilla.org/show_bug.cgi?id=471658#c36 IMO, don't let the kids use Firefox due to this Bug. Or install a good external Parental Control program that records browsing history, as the one that comes with Windows doesn't do as much in Firefox as it does in IE, because of this Bug <br /> https://support.mozilla.com/en-US/kb/Parental+controls.