If you ever tested mashup rendering on mobile phones, you probably experienced that the mashup was not sizing to fit your mobile display.
This "MobileHeader" extension enables to auto adapt the mashup to mobile displays.
It adds the following parameters to the HTML header:
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
In the composer just drop the "MobileHeader" extension into a section of the mashup.
This extension was tested until version 7.4.