Great for parents! Rated 5 out of 5 stars

Updated review:
This is a great add-on for parents who would like to monitor their kids' internet activities. Highly recommended!
Previous review: (All issues have been addressed)
First, I want to thank RichieB2B for creating the two add-ons which disable private browsing. However, for the latest version of Firefox (16.0.1), each version has a critical flaw. "Disable Private Browsing 1.7.1" still allows one to delete browsing history through the Firefox menu by choosing "History" and deleting individual entries or entire days. "Disable Private Browsing Plus 1.7" does prevent one form deleting browser history but it can easily be disabled or deleted by accessing the add-ons Manager and clicking "disable" or "delete" and restarting Firefox. In other words, one does not need to restart in Safe Mode to disable the Plus version. If RichieB2B comes up with a version which can only be disabled in safe mode and disables not only private browsing but also deleting web history, I would be grateful and highly recommend it to all parents.

This review is for a previous version of the add-on (1.7.1-signed.1-signed). 

Thanks for reporting the issue with "Disable Private Browsing Plus 1.7" I have just submitted version 1.7.1 of the Plus version that can only be disabled or removed in Safe Mode.