diff --git a/network/web/firefox/files/riscv64-no-lto.patch b/network/web/firefox/files/riscv64-no-lto.patch
new file mode 100644
index 0000000000..90c9b5def1
--- /dev/null
+++ b/network/web/firefox/files/riscv64-no-lto.patch
@@ -0,0 +1,16 @@
+--- a/config/makefiles/rust.mk
++++ b/config/makefiles/rust.mk
+@@ -91,11 +91,13 @@
+ ifndef rustflags_sancov
+ # Never enable when coverage is enabled to work around https://github.com/rust-lang/rust/issues/90045.
+ ifndef MOZ_CODE_COVERAGE
++ifeq (,$(findstring riscv64,$(RUST_TARGET)))
+ ifeq (,$(findstring gkrust_gtest,$(RUST_LIBRARY_FILE)))
+ cargo_rustc_flags += -Clto=thin
+ endif
+ # We need -Cembed-bitcode=yes for all crates when using -Clto.
+ RUSTFLAGS += -Cembed-bitcode=yes
++endif
+ endif
+ endif
+ endif
diff --git a/network/web/firefox/files/rust-lto-thin.patch b/network/web/firefox/files/rust-lto-thin.patch
new file mode 100644
index 0000000000..788fceab39
--- /dev/null
+++ b/network/web/firefox/files/rust-lto-thin.patch
@@ -0,0 +1,12 @@
+set rust crate lto to thin to not use fatlto for gkrust which fails sometimes
+--- a/config/makefiles/rust.mk
++++ b/config/makefiles/rust.mk
+@@ -92,7 +92,7 @@
+ # Never enable when coverage is enabled to work around https://github.com/rust-lang/rust/issues/90045.
+ ifndef MOZ_CODE_COVERAGE
+ ifeq (,$(findstring gkrust_gtest,$(RUST_LIBRARY_FILE)))
+-cargo_rustc_flags += -Clto$(if $(filter full,$(MOZ_LTO_RUST_CROSS)),=fat)
++cargo_rustc_flags += -Clto=thin
+ endif
+ # We need -Cembed-bitcode=yes for all crates when using -Clto.
+ RUSTFLAGS += -Cembed-bitcode=yes
diff --git a/network/web/firefox/pspec.xml b/network/web/firefox/pspec.xml
index b484464ea9..b319b65708 100644
--- a/network/web/firefox/pspec.xml
+++ b/network/web/firefox/pspec.xml
@@ -77,6 +77,8 @@
             <Dependency>jack-audio-connection-kit-devel</Dependency>
         </BuildDependencies>
         <Patches>
+            <Patch level="1">rust-lto-thin.patch</Patch>
+            <Patch level="1">riscv64-no-lto.patch</Patch>
 <!--             <Patch level="1">0002-Bug-1804973-Wayland-Check-size-for-valid-EGLWindows-.patch</Patch> -->
 <!--             <Patch level="1">zstandard-0.18.0.diff</Patch> -->
         </Patches>