Opening icecat from commandline I notice the below, it does not effect icecat that I can tell. Also, the default user agent string uses i686 rather PPC. I am using the binary provided via gnu located at osuosl version 6.0. And the default search is google rather then duckduckgo or scroogle... not really important that last bit :)
:~/Desktop$ icecat WARNING: Application calling GLX 1.3 function "glXCreatePixmap" when GLX 1.3 is not supported! This is an application bug! failed to create drawable -- http://www.fastmail.fm - Choose from over 50 domains or use your own -- http://gnuzilla.gnu.org
