Apple - How to Kiosk Mode a Web Page OSX - Chrome

Have you considered using Opera as a browser for the signup. It does provide a kiosk mode that is easy to enable:

/Applications/Opera.app/Contents/MacOS/Opera -kioskmode -noexit

The documentation has information about a 'Go To Home' timeout mode that will restore the kiosk after a set interval.

Chrome has a Kiosk mode for Mac OS. Sort of. You can pass it command line args to get the kiosk mode as follows:

/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --kiosk --app=192.168.168.53

=> This opens a chrome window without any window decorations, maximized to full-screen (like any other Mac App that is maximized.

For all the Chrome command line args check out: http://peter.sh/experiments/chromium-command-line-switches/#load-extension

There's a plugin called Saft which enables kiosk mode in Safari. (Saft has been discontinued as of late 2012; it doesn't work beyond Safari 5.0.5.) If the computer is being used in public, create a new guest user in the system preferences and use this one for the fair. Even if somebody breaks out of the kiosk mode, they can't see your private data or mess anything up.

If you want to stay with Chrome, there's an AppleScript on Superuser, to launch Chrome in kiosk mode.