Directions for installing the FireFox extension are listed here.
Make sure your XForms files have the .xhtml extension.
This document describes how the FireFox extension adheres or differs from the formal W3C specification.
To use the FormFaces solution you will need to do two things. First add the following line to all your forms:
formsPlayer allows users to view XForms pages within Internet Explorer, on Windows. The processor was the first to fully implement the XForms 1.0 standard, and continues to lead the way by implementing the latest Working Draft of XForms 1.1. For details on how to install formsPlayer and set up a development environment, and then use this to follow a detailed Introduction to XForms tutorial, see Programming formsPlayer and XForms. The tutorial includes in depth discussion of two forms; one that saves bookmarks to del.icio.us, and another that searches Flickr.
X-Smiles is a browser that includes XForms support. See http://www.x-smiles.org/ for details. X-Smiles allows many of the programs in this book to run without modification. X-Smiles does not support some XHTML standards. For a full report of what features are working in X-Smiles see this link: http://www.x-smiles.org/features_xforms.html