These are out since end of Nov. Actually these versions are now in the mozilla_1_8_branch for the official firefox-2.0.0.1-bin versesion I simply bumped them from nspr-4.6.3-r1 and nss-3.11.3-r1. The fbsd-patch for nspr is now contained in the source. In the nss-ebuild the NSPR_VER should be adjuseted .
Just forgot to mention that I successfully upgraded to mozilla-firefox-2.0.0.1 with these nss/nspr versions
Added, thanks!