You will also need a more recent version of NSPR. You can get v4.4.1 from ftp://ftp.mozilla.org/pub/mozilla.org/nspr/releases/v4.4.1/
I wouldn't recommend replacing the versions in /usr/lib with what you download. The versions in /usr/lib are used by mozilla/firefox and while NSS and NSPR have excellent backwards compatibility I don't want to hose up your browser.
What you can do is untar it in /usr/local and then add /usr/local/nss-3.10/lib (and the NSPR directory) to your LD_LIBRARY_PATH before starting Apache.
rob
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