diff --git a/mail/thunderbird/Makefile b/mail/thunderbird/Makefile
index 5de5800ccb7f..cf2692dcc6f8 100644
--- a/mail/thunderbird/Makefile
+++ b/mail/thunderbird/Makefile
@@ -1,78 +1,78 @@
 PORTNAME=	thunderbird
-DISTVERSION=	115.11.2
+DISTVERSION=	115.12.0
 CATEGORIES=	mail news net-im wayland
 MASTER_SITES=	MOZILLA/${PORTNAME}/releases/${DISTVERSION}/source \
 		MOZILLA/${PORTNAME}/candidates/${DISTVERSION}-candidates/build1/source
 DISTFILES=	${DISTNAME}.source${EXTRACT_SUFX}
 
 MAINTAINER=	gecko@FreeBSD.org
 COMMENT=	Mozilla Thunderbird is standalone mail and news that stands above
 WWW=		https://www.mozilla.com/thunderbird/
 
 BUILD_DEPENDS=	nspr>=4.32:devel/nspr \
 		nss>=3.90:security/nss \
 		libevent>=2.1.8:devel/libevent \
 		harfbuzz>=7.3.0:print/harfbuzz \
 		graphite2>=1.3.14:graphics/graphite2 \
 		png>=1.6.39:graphics/png \
 		dav1d>=1.0.0:multimedia/dav1d \
 		libvpx>=1.13.0:multimedia/libvpx \
 		${PYTHON_PKGNAMEPREFIX}sqlite3>0:databases/py-sqlite3@${PY_FLAVOR} \
 		v4l_compat>0:multimedia/v4l_compat \
 		autoconf2.13:devel/autoconf2.13 \
 		nasm:devel/nasm \
 		yasm:devel/yasm \
 		zip:archivers/zip
 LIB_DEPENDS=	libjson-c.so:devel/json-c \
 		libbotan-2.so:security/botan2
 
 SSP_UNSAFE=	yes
 USE_GECKO=	gecko
 # cannot use system icu: calendar is completely broken by
 # https://unicode-org.atlassian.net/browse/ICU-22132 (fix not in 74.1)
 USE_MOZILLA=	-icu -sqlite
 CFLAGS_powerpc64le=	-DSQLITE_BYTEORDER=1234
 
 USES=		tar:xz
 
 MOZ_OPTIONS=	--enable-application=comm/mail --enable-official-branding
 MOZ_OPTIONS+=	--with-system-bz2 --with-system-jsonc --with-system-botan
 MOZ_MK_OPTIONS=	MOZ_THUNDERBIRD=1 MAIL_PKG_SHARED=1
 MOZ_EXPORT=		MOZ_THUNDERBIRD=1 MAIL_PKG_SHARED=1
 
 PORTNAME_ICON=	${MOZILLA}.png
 PORTNAME_ICON_SRC=	${PREFIX}/lib/${MOZILLA}/chrome/icons/default/default48.png
 
 SYSTEM_PREFS=	${FAKEDIR}/lib/${PORTNAME}/defaults/pref/${PORTNAME}.js
 
 OPTIONS_DEFAULT=CANBERRA
 
 .include "${.CURDIR}/../../www/firefox/Makefile.options"
 
 .include <bsd.port.options.mk>
 
 .if ${ARCH} == powerpc64
 MOZ_OPTIONS+=	--without-wasm-sandboxed-libraries
 .else
 BUILD_DEPENDS+=	${LOCALBASE}/share/wasi-sysroot/lib/wasm32-wasi/libc++abi.a:devel/wasi-libcxx${LLVM_VERSION} \
 		${LOCALBASE}/share/wasi-sysroot/lib/wasm32-wasi/libc.a:devel/wasi-libc \
 		wasi-compiler-rt${LLVM_VERSION}>0:devel/wasi-compiler-rt${LLVM_VERSION}
 MOZ_OPTIONS+=	--with-wasi-sysroot=${LOCALBASE}/share/wasi-sysroot
 .endif
 
 post-extract:
 	@${SED} -e 's|@PORTNAME_ICON@|${PORTNAME_ICON:R}|;s|@MOZILLA@|${MOZILLA}|' \
 		<${FILESDIR}/thunderbird.desktop.in >${WRKDIR}/${MOZILLA_EXEC_NAME}.desktop
 
 post-patch:
 	@${REINPLACE_CMD} -e 's|%%LOCALBASE%%|${LOCALBASE}|g' \
 		${WRKSRC}/comm/mail/app/nsMailApp.cpp
 
 port-pre-install:
 	${MKDIR} ${STAGEDIR}${PREFIX}/lib/${PORTNAME}/defaults
 
 post-install:
 	${INSTALL_DATA} ${WRKDIR}/${MOZILLA_EXEC_NAME}.desktop ${STAGEDIR}${PREFIX}/share/applications
 	${LN} -sf ${PORTNAME_ICON_SRC} ${STAGEDIR}${PREFIX}/share/pixmaps/${PORTNAME_ICON}
 
 .include <bsd.port.mk>
diff --git a/mail/thunderbird/distinfo b/mail/thunderbird/distinfo
index a75e2544d70b..71b3f31157fb 100644
--- a/mail/thunderbird/distinfo
+++ b/mail/thunderbird/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1717189136
-SHA256 (thunderbird-115.11.2.source.tar.xz) = 6ccbea9a2f5daa7e64269fbfcc035d99a472c1704a9b7803c8444e5907f9b3ab
-SIZE (thunderbird-115.11.2.source.tar.xz) = 537376512
+TIMESTAMP = 1717781997
+SHA256 (thunderbird-115.12.0.source.tar.xz) = ed105c8d9298bcaee7c02e9325abd6a0d19926605bac34460de649628fdc67fb
+SIZE (thunderbird-115.12.0.source.tar.xz) = 536000896
diff --git a/mail/thunderbird/files/patch-rust-1.78.0-arm b/mail/thunderbird/files/patch-rust-1.78.0-arm
deleted file mode 100644
index 7db8038cfaeb..000000000000
--- a/mail/thunderbird/files/patch-rust-1.78.0-arm
+++ /dev/null
@@ -1,64 +0,0 @@
-Relevant bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=1882291
-
-
-diff --git a/Cargo.lock b/Cargo.lock
---- Cargo.lock
-+++ Cargo.lock
-@@ -4274,10 +4274,11 @@
- [[package]]
- name = "qcms"
- version = "0.2.0"
- dependencies = [
-  "libc",
-+ "version_check",
- ]
- 
- [[package]]
- name = "qlog"
- version = "0.4.0"
-diff --git a/gfx/qcms/Cargo.toml b/gfx/qcms/Cargo.toml
---- gfx/qcms/Cargo.toml
-+++ gfx/qcms/Cargo.toml
-@@ -18,5 +18,8 @@
- 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
-+++ 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
---- gfx/qcms/src/lib.rs
-+++ gfx/qcms/src/lib.rs
-@@ -5,13 +5,15 @@
- #![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
-