Help installing Firefox 18 throughout enterprise

[jennjoe4]

Hello everyone i have been asked to install Firefox 18 on all the computers in our school district. Which consist of 4 buildings and about 1500+ computers. These computers are running OS X 10.7.5. To keep from visiting every computer in each building . I would like to find a way to push Firefox 18 out using either a Unix script or with Apple Remote Desktop as a custom PKG file.

I have tried pushing the Firefox PKG out through Apple remote desktop before, but when the teacher went to use Firefox on the computer. They were presented with a continue setup box "about importing settings from Safari". I would like to know any special switches to using with ARD or a Unix Script to avoid this post install box..

Thanks