$ git clone -n https://src.fedoraproject.org/rpms/firefox.git /var/lib/mock/f33-build-199427-47945/root/chroot_tmpdir/scmroot/firefox
Cloning into '/var/lib/mock/f33-build-199427-47945/root/chroot_tmpdir/scmroot/firefox'...
$ git reset --hard c960c03a4857ee2765dbd4b622df7b3993824dc6
HEAD is now at c960c03 Disable ffvpx when va-api is enabled