The ECF system was designed to work with Internet Explorer . Internet Explorer is available to most users since it is part of the Microsoft operating system. Internet Explorer for Macs is no longer supported or available for download, refer to Apple Safari for more information. Since some users occasionally have difficulty when using Internet Explorer, we recommend you have another Internet browser available to you for electronic filing. There are many Internet browsers available. Netscape Navigator and Mozilla Firefox are two that may be downloaded for free.