The font-resize is not a module position, but a template parameter...
So if you want to change the font-resize to be a module position, you have to edit 2 files.
Let´s call the module "fontresize"
1) /templates/jf_vihrea/index.php
line 149
<?php if ($templateparams->get('fontresizer')) : ?>
<div id="fontsize"></div>
<?php endif; ?>
change to:
<?php if ($this->countModules( 'fontresize' )) : ?>
<div id="fontsize">
<jdoc:include type="modules" name="fontresize" />
</div>
<?php endif; ?>
You will have to customize your css also...!
2) /templates/jf_vihrea/templateDetails.xml
line 43
<positions>
<position>debug</position>
<position>mainmenu</position>
...
change to:
<positions>
<position>debug</position>
<position>mainmenu</position>
<position>fontresize</position>
....
bye