diff --git a/firefox.spec b/firefox.spec
index c600f73846c0fae9fce85ec3da4925385ce7220c..cfa7404f8a68bd865c951ec4c79f1dcd47fbabb0 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -45,7 +45,7 @@
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
 Version:        115.9.0
-Release:        1
+Release:        2
 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
@@ -79,6 +79,7 @@ Source37:       mochitest-python.tar.gz
 # Build patches
 Patch01:        disable-glean-sdk,psutil,zstandard.patch
 Patch02:        firefox-gcc-build.patch
+Patch03:        fix-rust-1.78-unknown-feature-stdsimd-error.patch
 
 
 # -- Upstreamed patches --
@@ -396,6 +397,7 @@ rm -vf ./*/layout/inspector/tests/chrome/test_fontVariationsAPI.css
 # Build patches
 %patch -P1 -p1
 %patch -P2 -p1 -b .firefox-gcc-build
+%patch -P3 -p1
 
 # -- Upstreamed patches --
 %patch -P51 -p1 -b .mozilla-bmo1170092
@@ -955,6 +957,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 %endif
 
 %changelog
+* Fri May 10 2024 wangkai <13474090681@163.com> - 115.9.0-2
+- fix rust-1.78 unknown feature stdsimd error
+
 * Wed Mar 20 2024 wangkai <13474090681@163.com> - 115.9.0-1
 - Update to 115.9.0
 - Fix CVE-2024-2616 CVE-2024-2608 CVE-2024-2610 CVE-2024-2612 CVE-2024-2614 CVE-2023-5388 CVE-2024-2607 CVE-2024-2611
diff --git a/fix-rust-1.78-unknown-feature-stdsimd-error.patch b/fix-rust-1.78-unknown-feature-stdsimd-error.patch
new file mode 100644
index 0000000000000000000000000000000000000000..9d31d3d0aefdd1e72f9b41d905399f63834db3d7
--- /dev/null
+++ b/fix-rust-1.78-unknown-feature-stdsimd-error.patch
@@ -0,0 +1,92 @@
+Origin: https://hg.mozilla.org/integration/autoland/rev/e9b01ce8e2fe
+
+# HG changeset patch
+# User Jeff Muizelaar <jmuizelaar@mozilla.com>
+# Date 1709608348 0
+# Node ID e9b01ce8e2fe053ffef77505f05cf18ed0b9fcd2
+# Parent  171664703051d94e1be995b74ad97a9dff5beea5
+Bug 1882291. Switch to stdarch_arm_neon_intrinsics feature on rust >=1.78. r=glandium
+
+We only need this on ARM32 because the ARM64 intrinsics are stable.
+
+stdarch_arm_neon_intrinsics was split out from stdsimd here:
+https://github.com/rust-lang/stdarch/pull/1486
+
+Differential Revision: https://phabricator.services.mozilla.com/D203039
+
+diff --git a/Cargo.lock b/Cargo.lock
+--- a/Cargo.lock
++++ b/Cargo.lock
+@@ -4579,16 +4579,17 @@ dependencies = [
+  "libc",
+ ]
+ 
+ [[package]]
+ name = "qcms"
+ version = "0.2.0"
+ dependencies = [
+  "libc",
++ "version_check",
+ ]
+ 
+ [[package]]
+ name = "qlog"
+ version = "0.4.0"
+ source = "registry+https://github.com/rust-lang/crates.io-index"
+ checksum = "8777d5490145d6907198d48b3a907447689ce80e071b3d8a16a9d9fb3df02bc1"
+ dependencies = [
+diff --git a/gfx/qcms/Cargo.toml b/gfx/qcms/Cargo.toml
+--- a/gfx/qcms/Cargo.toml
++++ b/gfx/qcms/Cargo.toml
+@@ -15,8 +15,11 @@ categories = ["graphics"]
+ default = ["iccv4-enabled", "cmyk"]
+ c_bindings = ["libc"]
+ neon = []
+ iccv4-enabled = []
+ cmyk = []
+ 
+ [dependencies]
+ libc = {version = "0.2", optional = true }
++
++[build-dependencies]
++version_check = "0.9"
+diff --git a/gfx/qcms/build.rs b/gfx/qcms/build.rs
+new file mode 100644
+--- /dev/null
++++ b/gfx/qcms/build.rs
+@@ -0,0 +1,7 @@
++extern crate version_check as rustc;
++
++fn main() {
++    if rustc::is_min_version("1.78.0").unwrap_or(false) {
++        println!("cargo:rustc-cfg=stdsimd_split");
++    }
++}
+diff --git a/gfx/qcms/src/lib.rs b/gfx/qcms/src/lib.rs
+--- a/gfx/qcms/src/lib.rs
++++ b/gfx/qcms/src/lib.rs
+@@ -2,19 +2,21 @@
+ */
+ 
+ #![allow(dead_code)]
+ #![allow(non_camel_case_types)]
+ #![allow(non_snake_case)]
+ #![allow(non_upper_case_globals)]
+ // These are needed for the neon SIMD code and can be removed once the MSRV supports the
+ // instrinsics we use
+-#![cfg_attr(feature = "neon", feature(stdsimd))]
++#![cfg_attr(all(stdsimd_split, target_arch = "arm", feature = "neon"), feature(stdarch_arm_neon_intrinsics))]
++#![cfg_attr(all(stdsimd_split, target_arch = "arm", feature = "neon"), feature(stdarch_arm_feature_detection))]
++#![cfg_attr(all(not(stdsimd_split), target_arch = "arm", feature = "neon"), feature(stdsimd))]
+ #![cfg_attr(
+-    feature = "neon",
++    all(target_arch = "arm", feature = "neon"),
+     feature(arm_target_feature, raw_ref_op)
+ 
+ )]
+ 
+ /// These values match the Rendering Intent values from the ICC spec
+ #[repr(C)]
+ #[derive(Clone, Copy, Debug)]
+ pub enum Intent {
+