Source: firefox-esr Version: 52.2.0esr-1 Severity: serious https://buildd.debian.org/status/package.php?p=firefox-esr&suite=sid
... checking for valloc in malloc.h... yes checking for valloc in unistd.h... no checking NSPR selection... system checking for nspr-config... no checking for NSPR - version >= 4.13.1... no configure: error: you do not have NSPR installed or your version is older than 4.13.1. ...
