Best way to "hide" firefox?

I always go on the computers at school and they only give us limited accounts.

Thankfully firefox lets you install to the my videos and such folders.

I had a shortcut in favorites, renamed to IE and changed the icon, but they still deleted everything I had in my videos folder.

What is a good place to hide the firefox folder?

"The computers are to only be used for educational purposes"

But it makes sense if you don't want viruses and such.

I found "application data" to work well.

They aren't good enough to look in there IMO just type in "application data" after the folder and violla.

Well there is only "student" and admin, all of our user stuff is in the program's server