firefox real kiosk (r-kiosk) - customising

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http://askubuntu.com – I would like to use r-kiosk plugin for my firefox to launch in to full screen mode and preventing the users to meddle with the setup. But I would need to make some changes like described below. Allow URL Bar/address Bar so that users can change to another URL if needed apart from the home page. Allow java programs to be executed from a web-browser since I am using a jar to do some text printing. Would some one point to a write up on r-kiosk on how to customise it? I tried fire-fox 7.0 and 3.6.4. (HowTos)