mozilla-nspr from home:TrackMen:MozillaFirefox:102.7esr project
Select Your Operating System
Add repository and install manually
For 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:TrackMen:MozillaFirefox:102.7esr/15.3/home:TrackMen:MozillaFirefox:102.7esr.repo zypper refresh zypper install mozilla-nspr