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So I was looking at the diff for firefox-72beta1, as you do.
AFAICS this has not been released yet, but the release notes are at https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.48_release_notes
The NSS team has released Network Security Services (NSS) 3.48 on XX December 2019, which is a minor release.
There is also a link for the source tarball there, which 404s at the moment.