|User since||October 13, 2008|
|Number of add-ons developed||0 add-ons|
|Average rating of developer's add-ons||Not yet rated|
Seems to be working Rated 4 out of 5 stars
But it must be used with "public fox" extension to prevent uninstalling it. Public fox asks for a password to enter settings, to delete history and to enter the extension panel.
However, a smart user can stil run firefox with creating a new profile (extensions are per profile, so there will be none in a new profile) and keep surfing in private mode.
Therefore the best method to disable private bowsing is to phisycally remove the file nsPrivateBrowsingService.js from Program Files / Firefox folder and taking away the administrative rights, so the user will not be able to reinstall firefox.
external program Rated 3 out of 5 stars
a solution is to install some program like "winmail.dat opener" or similar. then, in the tools menu tell thunderbird to open the .dat files with this (external) program.
there are a few programs like winmail.dat opener and you can find them in google.