$ git clone -n https://src.fedoraproject.org/rpms/firefox.git /var/lib/mock/f33-build-580350-66211/root/chroot_tmpdir/scmroot/firefox
Cloning into '/var/lib/mock/f33-build-580350-66211/root/chroot_tmpdir/scmroot/firefox'...
$ git reset --hard 18b80a26feae3b0febbba839e85c1bd66b22e146
HEAD is now at 18b80a2 Added fix for mozbz#1701089 (Widevine playback issues)