How can I disable private browsing for the high school students on the school laptops?

Hello, I work for a school district and one of the schools in the district is a digital Academy, which means that students work completely with laptops. The grade level of the students ranged from grade 6 to grade 12. We must be able to install pulgins to block explicit content and then disable private browsing ability to subvert the. They are working on laptop computer provided by the school with a derivative of linux ubuntu running on them. the version of firefox is 5. I tried the solution of http://kb.mozillazine.org/User:Dickvl / Private_Browsing_disable
and it works with firefox 4 but not 5. Help, please! Any child is monitored you can not watch all the time, and both parents that teachers need to know what the kids are up to.

-Thank you

You have double-checked that the extension has been updated maybe because of you as it looks like the same date that you posted pbdisable - 1.4 - fx.xpi (updated July 2, 2011)

Tags: Firefox

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