diff --git a/www/firefox/Makefile b/www/firefox/Makefile
index eb96b4484e28..3d3147a9ff2c 100644
--- a/www/firefox/Makefile
+++ b/www/firefox/Makefile
@@ -1,64 +1,65 @@
 PORTNAME=	firefox
 DISTVERSION=	151.0
+PORTREVISION=	1
 PORTEPOCH=	2
 CATEGORIES=	www wayland
 MASTER_SITES=	MOZILLA/${PORTNAME}/releases/${DISTVERSION}${DISTVERSIONSUFFIX}/source \
 		MOZILLA/${PORTNAME}/candidates/${DISTVERSION}${DISTVERSIONSUFFIX}-candidates/build1/source
 DISTFILES=	${DISTNAME}.source${EXTRACT_SUFX}
 
 MAINTAINER=	gecko@FreeBSD.org
 COMMENT=	Web browser based on the browser portion of Mozilla
 WWW=		https://www.firefox.com/
 
 BUILD_DEPENDS=	nspr>=4.32:devel/nspr \
 		nss>=3.123.1:security/nss \
 		libevent>=2.1.8:devel/libevent \
 		harfbuzz>=10.1.0:print/harfbuzz \
 		graphite2>=1.3.14:graphics/graphite2 \
 		png>=1.6.45:graphics/png \
 		dav1d>=1.0.0:multimedia/dav1d \
 		libvpx>=1.15.0:multimedia/libvpx \
 		${PYTHON_PKGNAMEPREFIX}sqlite3>0:databases/py-sqlite3@${PY_FLAVOR} \
 		v4l_compat>0:multimedia/v4l_compat \
 		nasm:devel/nasm \
 		yasm:devel/yasm \
 		zip:archivers/zip \
 		${LOCALBASE}/share/wasi-sysroot/lib/wasm32-wasip1/libc++abi.a:devel/wasi-libcxx${LLVM_VERSION} \
 		${LOCALBASE}/share/wasi-sysroot/lib/wasm32-wasip1/libc.a:devel/wasi-libc@${LLVM_VERSION} \
 		wasi-compiler-rt${LLVM_VERSION}>0:devel/wasi-compiler-rt${LLVM_VERSION}
 
 USE_GECKO=	gecko
 CONFLICTS_INSTALL=	firefox-esr
 USE_MOZILLA=	-sqlite
 # work around bindgen not finding ICU, e.g.
 # dist/include/mozilla/intl/ICU4CGlue.h:8:10: fatal error: 'unicode/uenum.h' file not found, err: true
 CONFIGURE_ENV+=	BINDGEN_CFLAGS="-I${LOCALBASE}/include"
 
 USES=		tar:xz
 # helpful when testing beta
 WRKSRC=		${WRKDIR}/${PORTNAME}-${DISTVERSION}
 
 FIREFOX_ICON=		${MOZILLA}.png
 FIREFOX_ICON_SRC=	${PREFIX}/lib/${MOZILLA}/browser/chrome/icons/default/default48.png
 MOZ_OPTIONS=	--enable-application=browser \
 		--enable-official-branding \
 		--with-wasi-sysroot=${LOCALBASE}/share/wasi-sysroot
 
 .include "${.CURDIR}/../../www/firefox/Makefile.options"
 
 post-extract:
 	@${SED} -e 's|@FIREFOX_ICON@|${FIREFOX_ICON:R}|;s|@MOZILLA@|${MOZILLA}|' \
 		<${FILESDIR}/firefox.desktop.in >${WRKDIR}/${MOZILLA_EXEC_NAME}.desktop
 
 post-patch:
 	@${REINPLACE_CMD} -e 's|%%LOCALBASE%%|${LOCALBASE}|g' \
 		${WRKSRC}/browser/app/nsBrowserApp.cpp
 	@${REINPLACE_CMD} -e 's|wasm32-wasi|&p1|' \
 		${WRKSRC}/build/moz.configure/toolchain.configure
 
 post-install:
 	${INSTALL_DATA} ${WRKDIR}/${MOZILLA_EXEC_NAME}.desktop ${STAGEDIR}${PREFIX}/share/applications
 	${MKDIR} ${STAGEDIR}${PREFIX}/share/pixmaps
 	${LN} -sf ${FIREFOX_ICON_SRC} ${STAGEDIR}${PREFIX}/share/pixmaps/${FIREFOX_ICON}
 
 .include <bsd.port.mk>
diff --git a/www/firefox/files/patch-bug2040125 b/www/firefox/files/patch-bug2040125
new file mode 100644
index 000000000000..22f1854608b2
--- /dev/null
+++ b/www/firefox/files/patch-bug2040125
@@ -0,0 +1,38 @@
+commit 40a17bafb1d1c647b2548c53cf948f900a43fae0
+Author: Christoph Moench-Tegeder <cmt@burggraben.net>
+
+    Bug 2040125 - add GetSystemProxyDirect() to libproxy path r=kershaw,valentin,#necko-reviewers
+    
+    In bmo #2028356 a "fast-path to skip proxy resolution[...]" was added,
+    but the required method GetSystemProxyDirect() was not added for
+    libproxy-enabled builds (all other cases - general Unix without
+    libproxy, OSX, Windows - got that function).
+    
+    This makes a "--enable-libproxy" build (MOZ_ENABLE_LIBPROXY) fail at
+    startup, as the symbol for nsUnixSystemProxySettings::GetSystemProxyDirect()
+    does not resolve.
+    
+    This adds GetSystemProxyDirect() to the MOZ_ENABLE_LIBPROXY case - it's
+    trivial, as we cannot know what libproxy will return for a specific URL,
+    thus the fast-path does not apply and we can just return "false".
+    
+    Differential Revision: https://phabricator.services.mozilla.com/D300937
+
+diff --git a/toolkit/system/unixproxy/nsLibProxySettings.cpp b/toolkit/system/unixproxy/nsLibProxySettings.cpp
+index 3de1b7ce9b8f..8b063d446c1e 100644
+--- a/toolkit/system/unixproxy/nsLibProxySettings.cpp
++++ b/toolkit/system/unixproxy/nsLibProxySettings.cpp
+@@ -111,6 +111,13 @@ nsUnixSystemProxySettings::GetSystemWPADSetting(bool* aSystemWPADSetting) {
+   return NS_OK;
+ }
+ 
++// we do not know if libproxy would return DIRECT or PROXY
++NS_IMETHODIMP
++nsUnixSystemProxySettings::GetSystemProxyDirect(bool* aResult) {
++  *aResult = false;
++  return NS_OK;
++}
++
+ NS_IMPL_COMPONENT_FACTORY(nsUnixSystemProxySettings) {
+   return do_AddRef(new nsUnixSystemProxySettings()).downcast<nsISupports>();
+ }