diff --git a/srcpkgs/firefox/patches/lto-thin.patch b/srcpkgs/firefox/patches/lto-thin.patch
deleted file mode 100644
index e85cbce3658..00000000000
--- a/srcpkgs/firefox/patches/lto-thin.patch
+++ /dev/null
@@ -1,19 +0,0 @@
-$OpenBSD: patch-config_makefiles_rust_mk,v 1.6 2021/01/26 15:52:58 landry Exp $
-
-use lto=thin to reduce memory pressure when building gkrust
-https://bugzilla.mozilla.org/show_bug.cgi?id=1644409
-https://bugzilla.mozilla.org/show_bug.cgi?id=1640982
-
-Index: config/makefiles/rust.mk
---- a/config/makefiles/rust.mk.orig
-+++ a/config/makefiles/rust.mk
-@@ -70,7 +70,8 @@ ifndef MOZ_DEBUG_RUST
- # gkrust_gtest. And not when doing cross-language LTO.
- ifndef MOZ_LTO_RUST_CROSS
- ifeq (,$(findstring gkrust_gtest,$(RUST_LIBRARY_FILE)))
--cargo_rustc_flags += -Clto
-+cargo_rustc_flags += -Clto=thin
-+export CARGO_PROFILE_RELEASE_LTO=thin
- endif
- # We need -Cembed-bitcode=yes for all crates when using -Clto.
- RUSTFLAGS += -Cembed-bitcode=yes
diff --git a/srcpkgs/firefox/patches/rust-lto-thin.patch b/srcpkgs/firefox/patches/rust-lto-thin.patch
new file mode 100644
index 00000000000..788fceab39f
--- /dev/null
+++ b/srcpkgs/firefox/patches/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/srcpkgs/firefox/template b/srcpkgs/firefox/template
index 3bf78b03741..083b409f27b 100644
--- a/srcpkgs/firefox/template
+++ b/srcpkgs/firefox/template
@@ -3,7 +3,7 @@
 # THIS PKG MUST BE SYNCHRONIZED WITH "srcpkgs/firefox-i18n".
 #
 pkgname=firefox
-version=114.0
+version=115.0
 revision=1
 build_helper="rust"
 short_desc="Mozilla Firefox web browser"
@@ -12,7 +12,7 @@ license="MPL-2.0, GPL-2.0-or-later, LGPL-2.1-or-later"
 homepage="https://www.mozilla.org/firefox/"
 # distfiles="${MOZILLA_SITE}/firefox/candidates/${version/beta/b}-candidates/build1/source/firefox-${version/beta/b}.source.tar.xz"
 distfiles="${MOZILLA_SITE}/firefox/releases/${version}/source/firefox-${version}.source.tar.xz"
-checksum=d23a0502742f52110ce496837ba82b47bf38d40585633787508ae5be9a5b4bc6
+checksum=7cdb23fe5ccb54334c8fe14c1e5dd89d5788f8e7b79a2bd9cc4eabdc7e54e898
 
 lib32disabled=yes