diff --git a/firefox.spec b/firefox.spec
index 5bab9a5..08de7f3 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -97,8 +97,8 @@ end}
 
 %global dts_version       11
 %global llvm_version      7.0
-# CentOS Stream 10 already ships rebased NSS
-%if 0%{?centos} == 10
+# CentOS Stream 10 and 9 already ship rebased NSS
+%if 0%{?centos} == 10 || 0%{?centos} == 9
 %global nspr_version      4.36
 %global nspr_version_max  4.37
 %global nss_version       3.112
@@ -1231,7 +1231,7 @@ echo "--------------------------------------------"
 %endif
 %patch -P9 -p1 -b .rhbz-2131158-webrtc-nss-fix
 %patch -P10 -p1 -b .build-ffvpx
-%if 0%{?rhel} == 10
+%if 0%{?rhel} == 10 || 0%{?centos} == 9
 %patch -P12 -p1 -b .system-nss-replace-xyber-with-mlkem
 %endif
 %patch -P13 -p1 -b .kiosk-vsync