mozilla-nss from home:Leen-Meyer:mozilla project
Sty agraw n unessmres nnek/m
Add repository and install manually
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Leen-Meyer:mozilla/15.5/home:Leen-Meyer:mozilla.repo zypper refresh zypper install mozilla-nss