Browser that does not support JavaScript

As per Infocenter the client side theme will use Server Side aggregation mode if the browser does not support JavaScript. I did some debugging to find out what it really means

• The head_extras.jspf has browser check like this
  

  
  >c:set var="isSSA" scope="request" value="${ renderMode eq 'force_ssa' or isSafari or (browser eq 'Moz' and (browserName ne 'Firefox' and browserName ne 'Opera') )}"/<
  

  
  It checks that if browser is Safari or Mozilla but not firefox or Opera then use Server side aggregatioin.
  


• If you disable javascript in your IE or Firefox then it wont force SSA, instead your page will stop rendering.


• I also tried changing the supported client configuration and change profile of Firefox to remove HTML_JAVASCRIPT. That means to say that Firefox does not have JavaScript capabilities but that does not work either