Firefox may need a fix for certain items in the Ilom webinterface to show
See as example:
http://aszeszo.blogspot.co.uk/2011/10/sun-ilom-fix-for-modern-firefox.html
Or also:
Create a file called userContent.css in ~/.mozilla/firefox/<PROFILE_ID>.default/chrome
Put this in the userContent.css file
@namespace url(http://www.w3.org/1999/xhtml);
#mainpage { visibility: visible !important; }