Creating an extra button for kiosk mode

Hi, I am obviously new here.
I have a project involving kiosk mode.
Almost everything is finished.

The final touch would be adding an “INFO” button on the side of the screen that would launch a .bat file.

I have tried different angles but adding this button through an add-on would be the easiest, if possible.

Thank you for your patience reading this.

check this out https://addons.mozilla.org/en-US/firefox/addon/open-in-internet-explorer/ and https://github.com/andy-portmen/native-client