diff --git a/.firefox.metadata b/.firefox.metadata
index 73a426a..4206d32 100644
--- a/.firefox.metadata
+++ b/.firefox.metadata
@@ -1,6 +1,6 @@
 b963b16f6879c5dbe6e33a3a3da058b494453922 SOURCES/cbindgen-vendor.tar.xz
-6a421b655b8310153e13f3ba323f091e1735feaf SOURCES/firefox-115.3.1esr.processed-source.tar.xz
-fea6ac1599da96cac5fcdd931c353feb8d6c14a0 SOURCES/firefox-langpacks-115.3.1esr-20230929.tar.xz
+c9051c7d9ac83384e3c049090861cbe449595e23 SOURCES/firefox-115.4.0esr.processed-source.tar.xz
+0a64220feb8757a00f38d37c6aba3180d2c265dd SOURCES/firefox-langpacks-115.4.0esr-20231017.tar.xz
 2dbf669fa4742e7065cc54cec19f96423032658b SOURCES/firefox-symbolic.svg
 2d8a6b2b30d5496735f49ffe8c8a7ede3a78a5ca SOURCES/mochitest-python.tar.gz
 d744f92e874688cc4b5376477dfdd639a97a6cd4 SOURCES/nspr-4.35.0-1.el8_1.src.rpm
diff --git a/.gitignore b/.gitignore
index 5f7d3a6..c802bdb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
 SOURCES/cbindgen-vendor.tar.xz
-SOURCES/firefox-115.3.1esr.processed-source.tar.xz
-SOURCES/firefox-langpacks-115.3.1esr-20230929.tar.xz
+SOURCES/firefox-115.4.0esr.processed-source.tar.xz
+SOURCES/firefox-langpacks-115.4.0esr-20231017.tar.xz
 SOURCES/firefox-symbolic.svg
 SOURCES/mochitest-python.tar.gz
 SOURCES/nspr-4.35.0-1.el8_1.src.rpm
diff --git a/README.debrand b/README.debrand
deleted file mode 100644
index 01c46d2..0000000
--- a/README.debrand
+++ /dev/null
@@ -1,2 +0,0 @@
-Warning: This package was configured for automatic debranding, but the changes
-failed to apply.
diff --git a/SOURCES/CVE-2023-44488-libvpx.patch b/SOURCES/CVE-2023-44488-libvpx.patch
new file mode 100644
index 0000000..79e5235
--- /dev/null
+++ b/SOURCES/CVE-2023-44488-libvpx.patch
@@ -0,0 +1,127 @@
+From 263682c9a29395055f3b3afe2d97be1828a6223f Mon Sep 17 00:00:00 2001
+From: Jerome Jiang <jianj@google.com>
+Date: Thu, 30 Jun 2022 13:48:56 -0400
+Subject: [PATCH] Fix bug with smaller width bigger size
+
+Fixed previous patch that clusterfuzz failed on.
+
+Bug: webm:1642
+Change-Id: If0e08e72abd2e042efe4dcfac21e4cc51afdfdb9
+---
+ test/resize_test.cc          | 11 +++--------
+ vp9/common/vp9_alloccommon.c | 13 ++++++-------
+ vp9/encoder/vp9_encoder.c    | 27 +++++++++++++++++++++++++--
+ 3 files changed, 34 insertions(+), 17 deletions(-)
+
+diff --git a/test/resize_test.cc b/test/resize_test.cc
+index fd1c2a92de6..20ad2229b46 100644
+--- a/test/resize_test.cc
++++ b/test/resize_test.cc
+@@ -102,11 +102,8 @@ void ScaleForFrameNumber(unsigned int frame, unsigned int initial_w,
+     if (frame < 30) {
+       return;
+     }
+-    if (frame < 100) {
+-      *w = initial_w * 7 / 10;
+-      *h = initial_h * 16 / 10;
+-      return;
+-    }
++    *w = initial_w * 7 / 10;
++    *h = initial_h * 16 / 10;
+     return;
+   }
+   if (frame < 10) {
+@@ -559,9 +556,7 @@ TEST_P(ResizeRealtimeTest, TestExternalResizeWorks) {
+   }
+ }
+ 
+-// TODO(https://crbug.com/webm/1642): This causes a segfault in
+-// init_encode_frame_mb_context().
+-TEST_P(ResizeRealtimeTest, DISABLED_TestExternalResizeSmallerWidthBiggerSize) {
++TEST_P(ResizeRealtimeTest, TestExternalResizeSmallerWidthBiggerSize) {
+   ResizingVideoSource video;
+   video.flag_codec_ = true;
+   video.smaller_width_larger_size_ = true;
+diff --git a/vp9/common/vp9_alloccommon.c b/vp9/common/vp9_alloccommon.c
+index e53883f621d..9e73e40ea09 100644
+--- a/vp9/common/vp9_alloccommon.c
++++ b/vp9/common/vp9_alloccommon.c
+@@ -135,13 +135,6 @@ int vp9_alloc_context_buffers(VP9_COMMON *cm, int width, int height) {
+     cm->free_mi(cm);
+     if (cm->alloc_mi(cm, new_mi_size)) goto fail;
+   }
+-
+-  if (cm->seg_map_alloc_size < cm->mi_rows * cm->mi_cols) {
+-    // Create the segmentation map structure and set to 0.
+-    free_seg_map(cm);
+-    if (alloc_seg_map(cm, cm->mi_rows * cm->mi_cols)) goto fail;
+-  }
+-
+   if (cm->above_context_alloc_cols < cm->mi_cols) {
+     vpx_free(cm->above_context);
+     cm->above_context = (ENTROPY_CONTEXT *)vpx_calloc(
+@@ -156,6 +149,12 @@ int vp9_alloc_context_buffers(VP9_COMMON *cm, int width, int height) {
+     cm->above_context_alloc_cols = cm->mi_cols;
+   }
+ 
++  if (cm->seg_map_alloc_size < cm->mi_rows * cm->mi_cols) {
++    // Create the segmentation map structure and set to 0.
++    free_seg_map(cm);
++    if (alloc_seg_map(cm, cm->mi_rows * cm->mi_cols)) goto fail;
++  }
++
+   if (vp9_alloc_loop_filter(cm)) goto fail;
+ 
+   return 0;
+diff --git a/vp9/encoder/vp9_encoder.c b/vp9/encoder/vp9_encoder.c
+index 69a4e3c314f..e3ba294c32f 100644
+--- a/vp9/encoder/vp9_encoder.c
++++ b/vp9/encoder/vp9_encoder.c
+@@ -2047,6 +2047,17 @@ static void alloc_copy_partition_data(VP9_COMP *cpi) {
+   }
+ }
+ 
++static void free_copy_partition_data(VP9_COMP *cpi) {
++  vpx_free(cpi->prev_partition);
++  cpi->prev_partition = NULL;
++  vpx_free(cpi->prev_segment_id);
++  cpi->prev_segment_id = NULL;
++  vpx_free(cpi->prev_variance_low);
++  cpi->prev_variance_low = NULL;
++  vpx_free(cpi->copied_frame_cnt);
++  cpi->copied_frame_cnt = NULL;
++}
++
+ void vp9_change_config(struct VP9_COMP *cpi, const VP9EncoderConfig *oxcf) {
+   VP9_COMMON *const cm = &cpi->common;
+   RATE_CONTROL *const rc = &cpi->rc;
+@@ -2126,6 +2137,8 @@ void vp9_change_config(struct VP9_COMP *cpi, const VP9EncoderConfig *oxcf) {
+     new_mi_size = cm->mi_stride * calc_mi_size(cm->mi_rows);
+     if (cm->mi_alloc_size < new_mi_size) {
+       vp9_free_context_buffers(cm);
++      vp9_free_pc_tree(&cpi->td);
++      vpx_free(cpi->mbmi_ext_base);
+       alloc_compressor_data(cpi);
+       realloc_segmentation_maps(cpi);
+       cpi->initial_width = cpi->initial_height = 0;
+@@ -2144,8 +2157,18 @@ void vp9_change_config(struct VP9_COMP *cpi, const VP9EncoderConfig *oxcf) {
+     update_frame_size(cpi);
+ 
+   if (last_w != cpi->oxcf.width || last_h != cpi->oxcf.height) {
+-    memset(cpi->consec_zero_mv, 0,
+-           cm->mi_rows * cm->mi_cols * sizeof(*cpi->consec_zero_mv));
++    vpx_free(cpi->consec_zero_mv);
++    CHECK_MEM_ERROR(
++        &cm->error, cpi->consec_zero_mv,
++        vpx_calloc(cm->mi_rows * cm->mi_cols, sizeof(*cpi->consec_zero_mv)));
++
++    vpx_free(cpi->skin_map);
++    CHECK_MEM_ERROR(
++        &cm->error, cpi->skin_map,
++        vpx_calloc(cm->mi_rows * cm->mi_cols, sizeof(cpi->skin_map[0])));
++
++    free_copy_partition_data(cpi);
++    alloc_copy_partition_data(cpi);
+     if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ)
+       vp9_cyclic_refresh_reset_resize(cpi);
+     rc->rc_1_frame = 0;
diff --git a/SOURCES/firefox-redhat-default-prefs.js b/SOURCES/firefox-redhat-default-prefs.js
index f130247..cdb98dd 100644
--- a/SOURCES/firefox-redhat-default-prefs.js
+++ b/SOURCES/firefox-redhat-default-prefs.js
@@ -14,8 +14,8 @@ pref("browser.shell.checkDefaultBrowser",   false);
 pref("network.manage-offline-status",       true);
 pref("extensions.shownSelectionUI",         true);
 pref("ui.SpellCheckerUnderlineStyle",       1);
-pref("startup.homepage_override_url",       "https://www.redhat.com");
-pref("startup.homepage_welcome_url",        "https://www.redhat.com");
+pref("startup.homepage_override_url",       "%HOMEPAGE%");
+pref("startup.homepage_welcome_url",        "%HOMEPAGE%");
 pref("browser.startup.homepage",            "data:text/plain,browser.startup.homepage=file:///%PREFIX%/share/doc/HTML/index.html");
 pref("media.gmp-gmpopenh264.autoupdate",true);
 pref("media.gmp-gmpopenh264.enabled",false);
diff --git a/SPECS/firefox.spec b/SPECS/firefox.spec
index 4c89165..6fd54ac 100644
--- a/SPECS/firefox.spec
+++ b/SPECS/firefox.spec
@@ -1,3 +1,4 @@
+%define homepage %(grep '^HOME_URL\s*=' /etc/os-release | sed 's/^HOME_URL\s*=//;s/^\s*"//;s/"\s*$//')
 %global disable_toolsets  0
 
 # Produce debug (non-optimized) package build. Suitable for debugging only
@@ -89,11 +90,11 @@ end}
 %endif
 
 %if 0%{?rhel} == 7
-  %global use_dts         1
+  %global use_dts          1
   %global use_llvm_ts      1
   %global use_nodejs_scl   1
   %global nodejs_build_req rh-nodejs10-nodejs
-  %global llvm_version    11.0
+  %global llvm_version     11.0
   %global use_python3_scl  1
 %endif
 
@@ -113,8 +114,8 @@ end}
 %endif
 
 
-%global mozappdir     %{_libdir}/firefox
-%global langpackdir   %{mozappdir}/browser/extensions
+%global mozappdir            %{_libdir}/firefox
+%global langpackdir          %{mozappdir}/browser/extensions
 %define bundled_install_path %{mozappdir}/bundled
 %global pre_version          esr
 # Workaround the dreaded "upstream source file changed content" rpminspect failure.
@@ -131,7 +132,7 @@ end}
 
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
-Version:        115.3.1
+Version:        115.4.0
 Release:        1%{?dist}
 URL:            https://www.mozilla.org/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
@@ -157,7 +158,7 @@ ExcludeArch:    aarch64 s390 ppc
 # Link to original tarball: https://archive.mozilla.org/pub/firefox/releases/%%{version}%%{?pre_version}/source/firefox-%%{version}%%{?pre_version}.source.tar.xz
 Source0:        firefox-%{version}%{?pre_version}%{?buildnum}.processed-source.tar.xz
 %if %{with langpacks}
-Source1:        firefox-langpacks-%{version}%{?pre_version}-20230929.tar.xz
+Source1:        firefox-langpacks-%{version}%{?pre_version}-20231017.tar.xz
 %endif
 Source2:        cbindgen-vendor.tar.xz
 Source3:        process-official-tarball
@@ -229,6 +230,9 @@ Patch155:       rhbz-1354671.patch
 # GENDIFF_DIFF_ARGS=-U0 gendiff firefox-xxxx .firefox-tests-reftest
 Patch201:       firefox-tests-xpcshell-freeze.patch
 
+# ---- Security patches ----
+Patch301:       CVE-2023-44488-libvpx.patch
+
 # BUILD REQURES/REQUIRES
 %if %{?system_nss} && !0%{?bundle_nss}
 BuildRequires:  pkgconfig(nspr) >= %{nspr_version}
@@ -973,15 +977,15 @@ to run Firefox explicitly on X11.
 %prep
 echo "Build environment"
 echo "--------------------------------------------"
-echo "dist                  %{?dist}"
-echo "RHEL 8 minor version: %{?rhel_minor_version}"
-echo "bundle_nss            %{?bundle_nss}"
-echo "system_nss            %{?system_nss}"
-echo "use_rust_ts           %{?use_rust_ts}"
-echo "use_dts               %{?use_dts}"
-echo "use_nodejs_scl        %{?use_nodejs_scl}"
-echo "use_llvm_ts           %{?use_llvm_ts}"
-echo "use_python3_scl       %{?use_python3_scl}"
+echo "dist                %{?dist}"
+echo "RHEL minor version: %{?rhel_minor_version}"
+echo "bundle_nss          %{?bundle_nss}"
+echo "system_nss          %{?system_nss}"
+echo "use_rust_ts         %{?use_rust_ts}"
+echo "use_dts             %{?use_dts}"
+echo "use_nodejs_scl      %{?use_nodejs_scl}"
+echo "use_llvm_ts         %{?use_llvm_ts}"
+echo "use_python3_scl     %{?use_python3_scl}"
 echo "--------------------------------------------"
 %setup -q -n %{name}-%{version}
 
@@ -1034,6 +1038,11 @@ echo "--------------------------------------------"
 # ---- Test patches ----
 %patch -P201 -p1 -b .firefox-tests-xpcshell-freeze
 
+# ---- Security patches ----
+cd media/libvpx/libvpx
+%patch -P301 -p1 -b .CVE-2023-44488-libvpx
+cd -
+
 %{__rm} -f .mozconfig
 %{__cp} %{SOURCE10} .mozconfig
 %{__cp} %{SOURCE24} mozilla-api-key
@@ -1544,6 +1553,7 @@ ln -s %{mozappdir}/defaults/preferences $RPM_BUILD_ROOT/%{mozappdir}/browser/def
 # Default preferences
 %{__cp} %{SOURCE12} %{buildroot}%{mozappdir}/defaults/preferences/all-redhat.js
 sed -i -e 's|%PREFIX%|%{_prefix}|' %{buildroot}%{mozappdir}/defaults/preferences/all-redhat.js
+sed -i -e 's|%HOMEPAGE%|%{homepage}|' %{buildroot}%{mozappdir}/defaults/preferences/all-redhat.js
 # Enable modern crypto for the key export on the RHEL9 only (rhbz#1764205)
 %if 0%{?rhel} == 9
   echo 'pref("security.pki.use_modern_crypto_with_pkcs12", true);' >> %{buildroot}%{mozappdir}/defaults/preferences/all-redhat.js
@@ -1717,6 +1727,11 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
+* Tue Oct 17 2023 Eike Rathke <erack@redhat.com> - 115.4.0-1
+- Update to 115.4.0 build1
+- Add fix for CVE-2023-44488
+- Set homepage from os-release HOME_URL
+
 * Fri Sep 29 2023 Eike Rathke <erack@redhat.com> - 115.3.1-1
 - Update to 115.3.1