In this paper, we describe a visual programming tool designed to make it easier for users with noJavaScript knowledge to be able to employ these features. Ourtool, tentatively named WIPER, adopts the Javascript DataflowArchitecture, which provides the means to package Javascript,HTML and Web service components as black box componentsthat can be composed to build rich Web mash ups. WIPER is builtas an extension to the FireFox Web browser. There are three mainadvantages to this approach. First, users can access the tool to editthe Web page they?re currently viewing without having to launchanother application. Second, it allows WIPER to directlymanipulate the target Web page in real time. Third, users canimmediately test the resulting Web page as viewed in the FireFoxWeb browser. The HTML generated from the modification isclean, readable, and void of any automatically generatedJavaScript. This makes it easy to further edit the HTML in a textor WYSIWYG editor.