Prism Prism is a web browser developed by Mozilla Foundation. This browser renders web pages using the Gecko engine. Prism supported platforms:Windows XPPrism supported devices:Windows DesktopPrism architectures:32-bitLatest user agents:Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2pre) Gecko/20100115 Prism/1.0b3