Mozilla is pushing ahead with its efforts to discourage the use of plug-in based content on the Web. The company gave developers until the end of March to apply for an exemption from the plug-ins planned for the Firefox browser. Plug-ins act as bridges between the browser and external applications that can render special types of content. Mozilla’s goal of ridding the Web of plugin-based content remains unchanged: “We strongly encourage site authors to phase out their use of plugins,” a Mozilla official says.”]