Using custom.css and custom.js
This feature is available since Firecheckout 3.0
Change firecheckout styles
To make a changes to firecheckout styles, you can create custom.css file at
skin/frontend/base/default/tm/firecheckout/css folder.
You can also place this file to the active_package/active_theme folder, if you
wish to change styles per theme.
The file will be automatically included at the firecheckout page.
Add custom javascript at firecheckout page
To add additional javascript logic at firecheckout page, you can create custom.js
file at skin/frontend/base/default/tm/firecheckout/js folder.
You can also place this file to the active_package/active_theme folder, if you
wish to add javascript for specific theme only.
The file will be automatically included at the firecheckout page.