I think its a really common case to want a applet to fill the whole browser window. This is hard to achieve today using the current packager and templates. I would even go to say that this should be the default for all applets we generate from Netbeans/packager.

Attached is the HTML template that works in Firefox 6, Chrome and IE 8 & 9. It should hopefully work on most other browsers to. You will also need to set the applet size for fx:deploy to 100x100 and include the workaround for now to change "100" to "100%";
 
        <fx:deploy width="100" height="100"
                  outdir="${basedir}/${dist.dir}" embedJNLP="true"
                  outfile="${application.title}">
            <fx:application refId="ensemble"/>
            <template file="${basedir}/web/index_template.html"
                    tofile="${dist.dir}/index.html"/>
            <fx:resources>
                <fx:fileset dir="${basedir}/${dist.dir}"
                            includes="Ensemble.jar"/>
            </fx:resources>
            <info title="Sample app: ${application.title}"
                  vendor="${application.vendor}"/>
        </fx:deploy>
        
        <!-- Workaround for bug with 100% size in templates -->
        <replace dir="${basedir}/${dist.dir}">
            <include name="index.html"/>
            <replacetoken><![CDATA[: 100,]]></replacetoken>
            <replacevalue><![CDATA[: '100%',]]></replacevalue>
        </replace>