diff --git a/build-debuginfo-fix.patch b/build-debuginfo-fix.patch
new file mode 100644
index 0000000..03fc300
--- /dev/null
+++ b/build-debuginfo-fix.patch
@@ -0,0 +1,24 @@
+diff -up firefox-91.0.1/third_party/libwebrtc/webrtc/modules/audio_processing/utility/ooura_fft.cc.debuginfo-fix firefox-91.0.1/third_party/libwebrtc/webrtc/modules/audio_processing/utility/ooura_fft.cc
+--- firefox-91.0.1/third_party/libwebrtc/webrtc/modules/audio_processing/utility/ooura_fft.cc.debuginfo-fix	2021-09-01 11:11:46.738285751 +0200
++++ firefox-91.0.1/third_party/libwebrtc/webrtc/modules/audio_processing/utility/ooura_fft.cc	2021-09-01 11:11:56.127319530 +0200
+@@ -21,7 +21,7 @@
+  *  be found in the AUTHORS file in the root of the source tree.
+  */
+ 
+-#include "modules/audio_processing//utility/ooura_fft.h"
++#include "modules/audio_processing/utility/ooura_fft.h"
+ 
+ #include <math.h>
+ 
+diff -up firefox-91.0.1/third_party/libwebrtc/webrtc/modules/audio_processing/utility/ooura_fft_sse2.cc.debuginfo-fix firefox-91.0.1/third_party/libwebrtc/webrtc/modules/audio_processing/utility/ooura_fft_sse2.cc
+--- firefox-91.0.1/third_party/libwebrtc/webrtc/modules/audio_processing/utility/ooura_fft_sse2.cc.debuginfo-fix	2021-09-01 11:12:26.513428847 +0200
++++ firefox-91.0.1/third_party/libwebrtc/webrtc/modules/audio_processing/utility/ooura_fft_sse2.cc	2021-09-01 11:12:32.117449009 +0200
+@@ -8,7 +8,7 @@
+  *  be found in the AUTHORS file in the root of the source tree.
+  */
+ 
+-#include "modules/audio_processing//utility/ooura_fft.h"
++#include "modules/audio_processing/utility/ooura_fft.h"
+ 
+ #include <emmintrin.h>
+ 
diff --git a/build-rhel7-nasm-dwarf.patch b/build-rhel7-nasm-dwarf.patch
new file mode 100644
index 0000000..5e2ba4a
--- /dev/null
+++ b/build-rhel7-nasm-dwarf.patch
@@ -0,0 +1,12 @@
+diff -up firefox-91.0.1/python/mozbuild/mozbuild/frontend/context.py.rhel7-nasm firefox-91.0.1/python/mozbuild/mozbuild/frontend/context.py
+--- firefox-91.0.1/python/mozbuild/mozbuild/frontend/context.py.rhel7-nasm	2021-08-31 08:02:10.814740774 +0200
++++ firefox-91.0.1/python/mozbuild/mozbuild/frontend/context.py	2021-08-31 08:04:03.967146994 +0200
+@@ -420,7 +420,7 @@ class AsmFlags(BaseCompileFlags):
+                 if self._context.config.substs.get("OS_ARCH") == "WINNT":
+                     debug_flags += ["-F", "cv8"]
+                 elif self._context.config.substs.get("OS_ARCH") != "Darwin":
+-                    debug_flags += ["-F", "dwarf"]
++                    debug_flags += ["-f", "elf32"]
+             elif (
+                 self._context.config.substs.get("OS_ARCH") == "WINNT"
+                 and self._context.config.substs.get("CPU_ARCH") == "aarch64"
diff --git a/firefox-centos-default-prefs.js b/firefox-centos-default-prefs.js
new file mode 100644
index 0000000..9ead3a2
--- /dev/null
+++ b/firefox-centos-default-prefs.js
@@ -0,0 +1,35 @@
+pref("app.update.auto",                     false);
+pref("app.update.enabled",                  false);
+pref("app.update.autoInstallEnabled",       false);
+pref("general.smoothScroll",                true);
+pref("intl.locale.matchOS",                 true);
+pref("toolkit.storage.synchronous",         0);
+pref("toolkit.networkmanager.disable",      false);
+pref("offline.autoDetect",                  true);
+pref("browser.backspace_action",            2);
+pref("browser.display.use_system_colors",   true);
+pref("browser.download.folderList",         1);
+pref("browser.link.open_external",          3);
+pref("browser.shell.checkDefaultBrowser",   false);
+pref("network.manage-offline-status",       true);
+pref("extensions.shownSelectionUI",         true);
+pref("ui.SpellCheckerUnderlineStyle",       1);
+pref("startup.homepage_override_url",       "http://www.redhat.com");
+pref("startup.homepage_welcome_url",        "http://www.redhat.com");
+pref("browser.startup.homepage",            "data:text/plain,browser.startup.homepage=file:///%PREFIX%/share/doc/HTML/index.html");
+pref("geo.wifi.uri", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
+pref("media.gmp-gmpopenh264.provider.enabled",false);
+pref("media.gmp-gmpopenh264.autoupdate",false);
+pref("media.gmp-gmpopenh264.enabled",false);
+pref("media.gmp-gmpopenh264.enabled",false);
+pref("plugins.notifyMissingFlash", false);
+/* See https://bugzilla.redhat.com/show_bug.cgi?id=1226489 */
+pref("browser.display.use_system_colors", false);
+pref("layers.use-image-offscreen-surfaces", false);
+/* Allow sending credetials to all https:// sites */
+pref("network.negotiate-auth.trusted-uris", "https://");
+pref("security.use_sqldb", false);
+/* Use OS settings for UI language */
+pref("intl.locale.requested", "");
+/* See https://bugzilla.redhat.com/show_bug.cgi?id=1672424 */
+pref("storage.nfs_filesystem", true);
\ No newline at end of file
diff --git a/firefox.spec b/firefox.spec
index ca75363..2cb16c5 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -1249,6 +1249,8 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 %changelog
 * Mon Oct 04 2021 Jan Horak <jhorak@redhat.com> - 91.2.0-4
 - Disable webrender on the s390x due to wrong colors: rhbz#2009503
+- Update to 91.2: rhbz#2009145
+- Modern algorithms in PKCS#12: rhbz#1764205
 
 * Wed Sep 29 2021 Jan Horak <jhorak@redhat.com> - 91.2.0-3
 - Update to 91.2.0 build1