diff --git a/firefox.spec b/firefox.spec
index 301bc55f346627450593b35ccb61f95744e4f4ac..ba6977f875ac7e0fc52df9a44487ac41153191ac 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -26,6 +26,7 @@
 %global system_drm        0
 %global use_pipewire_camera 0
 %global use_gcc_ts        0
+%global use_bundled_cbindgen  1
 
 # TODO: Revert this after SM2 & SM3 issue is fixed
 %global system_nss        0
@@ -58,7 +59,7 @@
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
 Version:        140.4.0
-Release:        2
+Release:        3
 URL:            https://www.mozilla.org/firefox/
 License:        MPL-1.1 or GPL-2.0-or-later or LGPL-2.0-or-later
 Source0:        https://ftp.mozilla.org/pub/firefox/releases/%{version}esr/source/firefox-%{version}esr.source.tar.xz
@@ -189,6 +190,10 @@ BuildRequires:  mesa-libgbm-devel
 BuildRequires:  pipewire-devel
 %endif
 
+%if !0%{?use_bundled_cbindgen}
+BuildRequires:  rust-cbindgen
+%endif
+
 BuildRequires:  cargo
 BuildRequires:  %{llvm}-clang-devel >= %{llvm_version}
 BuildRequires:  %{llvm}-clang >= %{llvm_version}
@@ -612,6 +617,8 @@ which ld
 which nasm
 which node
 which python3
+
+%if 0%{?use_bundled_cbindgen}
 # Bundled cbindgen
 mkdir -p my_rust_vendor
 cd my_rust_vendor
@@ -632,6 +639,7 @@ export PATH=`pwd`/.cargo/bin:$PATH
 cd -
 
 # end of Bundled cbindgen
+%endif
 
 mkdir %{_buildrootdir}/bin || :
 chmod a+x %{SOURCE32}
@@ -655,11 +663,12 @@ MOZ_OPT_FLAGS=$(echo "$MOZ_OPT_FLAGS" | %{__sed} -e 's/-g/-g0/')
 export MOZ_DEBUG_FLAGS=" "
 %endif
 
+MOZ_LINK_FLAGS="%{?build_ldflags}"
 ### NOTE: these sections are not required anymore. Alson --no-keep-memory + -Wl,-z,pack-relative-relocs causes
 ### ld to go OOM (https://sourceware.org/bugzilla/show_bug.cgi?id=30756)
 # Limit RAM usage during link
 #%ifarch s390x aarch64 %{ix86}
-#MOZ_LINK_FLAGS="-Wl,--no-keep-memory -Wl,--reduce-memory-overheads"
+MOZ_LINK_FLAGS="$MOZ_LINK_FLAGS -Wl,--no-keep-memory -Wl,--reduce-memory-overheads"
 #%endif
 
 %if 0%{?flatpak}
@@ -1012,6 +1021,10 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 %endif
 
 %changelog
+* Wed Oct 22 2025 Funda Wang <fundawang@yeah.net> - 140.4.0-3
+- support building with system cbindgen
+- build with system ldflags
+
 * Tue Oct 21 2025 Peng Haitao <htpengc@isoftstone.com> - 140.4.0-2
 - Modify openEuler to %{vendor}