diff --git a/.firefox.metadata b/.firefox.metadata
index 890456c..639d9d0 100644
--- a/.firefox.metadata
+++ b/.firefox.metadata
@@ -1,6 +1,6 @@
511960dd78451a06c9df76509635aeec05b2051a SOURCES/Python-2.7.8.tgz
467bdb846d67c01aed9e521fe0ef280065a50c3c SOURCES/devtoolset-2-binutils-2.23.52.0.1-10.el5.src.rpm
-894159e3100a3a90f893ac85a6b650c6b813c4c6 SOURCES/firefox-52.2.0esr.source.tar.xz
-7c0d2017daefbdadf2b7b0ad01ab37f667d77fcc SOURCES/firefox-langpacks-52.2.0esr-20170613.tar.xz
+10c9b836167b3d1dc500decd6e324adfebd6f854 SOURCES/firefox-52.3.0esr.source.tar.xz
+6b9a93948f31a086b9c5096e9ac01ec6283e6d13 SOURCES/firefox-langpacks-52.3.0esr-20170803.tar.xz
e5ba84786af5d0e0e23b1a9112c76821ef23306c SOURCES/gcc48-4.8.2-16.el5.src.rpm
77fd30f7ebc12a629a31c1e252cec06af55a71fe SOURCES/yasm-1.2.0-3.el5.src.rpm
diff --git a/.gitignore b/.gitignore
index 8c084f3..b3a4b9a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
SOURCES/Python-2.7.8.tgz
SOURCES/devtoolset-2-binutils-2.23.52.0.1-10.el5.src.rpm
-SOURCES/firefox-52.2.0esr.source.tar.xz
-SOURCES/firefox-langpacks-52.2.0esr-20170613.tar.xz
+SOURCES/firefox-52.3.0esr.source.tar.xz
+SOURCES/firefox-langpacks-52.3.0esr-20170803.tar.xz
SOURCES/gcc48-4.8.2-16.el5.src.rpm
SOURCES/yasm-1.2.0-3.el5.src.rpm
diff --git a/SOURCES/firefox-centos-default-prefs.js b/SOURCES/firefox-centos-default-prefs.js
deleted file mode 100644
index fd3108f..0000000
--- a/SOURCES/firefox-centos-default-prefs.js
+++ /dev/null
@@ -1,27 +0,0 @@
-pref("app.update.auto", false);
-pref("app.update.enabled", false);
-pref("app.update.autoInstallEnabled", false);
-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("general.smoothScroll", true);
-pref("general.useragent.vendor", "CentOS");
-pref("general.useragent.vendorSub", "FIREFOX_RPM_VR");
-pref("intl.locale.matchOS", true);
-pref("storage.nfs_filesystem", false);
-pref("dom.ipc.plugins.enabled.nswrapper*", false);
-pref("network.manage-offline-status", true);
-pref("toolkit.networkmanager.disable", false);
-pref("browser.startup.homepage", "data:text/plain,browser.startup.homepage=file:///usr/share/doc/HTML/index.html");
-pref("toolkit.storage.synchronous", 0);
-pref("startup.homepage_override_url", "http://www.centos.org");
-pref("startup.homepage_welcome_url", "http://www.centos.org");
-pref("extensions.shownSelectionUI", true);
-/* Workaround for rhbz#1110291 */
-pref("network.negotiate-auth.allow-insecure-ntlm-v1", true);
-/* Workaround for mozbz#1063315 */
-pref("security.use_mozillapkix_verification", false);
-pref("geo.wifi.uri", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
-pref("browser.tabs.remote.autostart", false);
diff --git a/SOURCES/firefox-redhat-default-prefs.js b/SOURCES/firefox-redhat-default-prefs.js
new file mode 100644
index 0000000..02113f4
--- /dev/null
+++ b/SOURCES/firefox-redhat-default-prefs.js
@@ -0,0 +1,27 @@
+pref("app.update.auto", false);
+pref("app.update.enabled", false);
+pref("app.update.autoInstallEnabled", false);
+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("general.smoothScroll", true);
+pref("general.useragent.vendor", "Red Hat");
+pref("general.useragent.vendorSub", "FIREFOX_RPM_VR");
+pref("intl.locale.matchOS", true);
+pref("storage.nfs_filesystem", false);
+pref("dom.ipc.plugins.enabled.nswrapper*", false);
+pref("network.manage-offline-status", true);
+pref("toolkit.networkmanager.disable", false);
+pref("browser.startup.homepage", "data:text/plain,browser.startup.homepage=file:///usr/share/doc/HTML/index.html");
+pref("toolkit.storage.synchronous", 0);
+pref("startup.homepage_override_url", "http://www.redhat.com");
+pref("startup.homepage_welcome_url", "http://www.redhat.com");
+pref("extensions.shownSelectionUI", true);
+/* Workaround for rhbz#1110291 */
+pref("network.negotiate-auth.allow-insecure-ntlm-v1", true);
+/* Workaround for mozbz#1063315 */
+pref("security.use_mozillapkix_verification", false);
+pref("geo.wifi.uri", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
+pref("browser.tabs.remote.autostart", false);
diff --git a/SPECS/firefox.spec b/SPECS/firefox.spec
index b9e9291..2136382 100644
--- a/SPECS/firefox.spec
+++ b/SPECS/firefox.spec
@@ -76,7 +76,7 @@
Summary: Mozilla Firefox Web browser
Name: firefox
-Version: 52.2.0
+Version: 52.3.0
Release: 2%{?dist}
URL: http://www.mozilla.org/projects/firefox/
License: MPLv1.1 or GPLv2+ or LGPLv2+
@@ -88,10 +88,10 @@ Group: Applications/Internet
# From ftp://archive.mozilla.org/pub/firefox/releases/%{version}%{?ext_version}/source
Source0: firefox-%{version}%{?ext_version}.source.tar.xz
%if %{build_langpacks}
-Source1: firefox-langpacks-%{version}%{?ext_version}-20170613.tar.xz
+Source1: firefox-langpacks-%{version}%{?ext_version}-20170803.tar.xz
%endif
Source10: firefox-mozconfig
-Source12: firefox-centos-default-prefs.js
+Source12: firefox-redhat-default-prefs.js
Source20: firefox.desktop
Source600: firefox.sh.in.rhel6
Source700: firefox.sh.in.rhel7
@@ -885,8 +885,8 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
#---------------------------------------------------------------------
%changelog
-* Tue Aug 01 2017 Johnny Hughes <johnny@centos.org> - 52.2.0-1
-- Manual Debranding after Auto Debranding failed.
+* Thu Aug 3 2017 Jan Horak <jhorak@redhat.com> - 52.3.0-2
+- Update to 52.3.0 ESR (b2)
* Tue Jun 13 2017 Jan Horak <jhorak@redhat.com> - 52.2.0-1
- Update to 52.2.0 ESR