I just noticed that because of Java Applet policies on Chrome (https://java.com/en/download/faq/chrome.xml... and almost the same for Firefox), mobilefirst Mobile browser simulator not working very well on all applet dependant feature (pictures, ...)
Now I figured out how to make the browser agree applet but even forcing unsecure settings (chrome://plugins/) not solving this problem (a disclaimer always appears when load the page before java execution, makes the page behave without applet)
The last disclaimer is a self signed message and can't get rid of this...
Is there a magic settings makes me find back that tool ? Better, is there a non Applet version of that tool ?
Worked with a JRE 7.x on Firefox (Warning : Firefox stop NPAPI support end 2016)