Pay.gov may be accessed from any computer capable of accessing the Internet using a web browser. Windows users may use Internet Explorer 6 or higher (all Pay.gov pages, forms, bills, and reports), Mozilla 1.4 and 1.75 (end-user pages, forms, and bills), or Firefox 1.5 or higher (end-user pages, forms, and bills). Mac OS X users may use Safari 1.2 or higher (end-user pages, forms, and bills). Other operating systems or browsers may be used to access Pay.gov, but such use is untested and unsupported at this time.