diff --git a/.gitignore b/.gitignore
index 192187c..e2e4028 100644
--- a/.gitignore
+++ b/.gitignore
@@ -220,3 +220,4 @@ firefox-3.6.4.source.tar.bz2
 /firefox-langpacks-50.1.0-20161213.tar.xz
 /firefox-51.0.source.tar.xz
 /firefox-langpacks-51.0-20170118.tar.xz
+/firefox-langpacks-51.0-20170119.tar.xz
diff --git a/firefox.spec b/firefox.spec
index 77f005c..5d707e1 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -1,6 +1,3 @@
-# Temporary disable
-ExcludeArch: armv7hl aarch64 ppc ppc64
-
 # Use system nspr/nss?
 %define system_nss        1
 
@@ -97,13 +94,13 @@ ExcludeArch: armv7hl aarch64 ppc ppc64
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
 Version:        51.0
-Release:        1%{?pre_tag}%{?dist}
+Release:        2%{?pre_tag}%{?dist}
 URL:            https://www.mozilla.org/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Group:          Applications/Internet
 Source0:        https://archive.mozilla.org/pub/firefox/releases/%{version}%{?pre_version}/source/firefox-%{version}%{?pre_version}.source.tar.xz
 %if %{build_langpacks}
-Source1:        firefox-langpacks-%{version}%{?pre_version}-20170118.tar.xz
+Source1:        firefox-langpacks-%{version}%{?pre_version}-20170119.tar.xz
 %endif
 Source10:       firefox-mozconfig
 Source12:       firefox-redhat-default-prefs.js
@@ -792,6 +789,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
+* Thu Jan 19 2017 Martin Stransky <stransky@redhat.com> - 51.0-2
+- Update to 51.0 (B2)
+
 * Wed Jan 18 2017 Martin Stransky <stransky@redhat.com> - 51.0-1
 - Update to 51.0 (B1)
 
diff --git a/sources b/sources
index abae569..0404ba3 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-SHA512 (firefox-51.0.source.tar.xz) = fbb80ee0fd425a9b3715c39d207aaaee5712b1d4274fa95479fefe8497ee871bef3566c9d604165cee4497d7f7032364477771808b7deb37b9020673bb6f60d2
-SHA512 (firefox-langpacks-51.0-20170118.tar.xz) = 5daac462218a7df2d6098f71484b4cccf8eafa98a9f05f6df522112db160bb0e51106057a6b6ab1e115c6881651b8af6c14ae7d888fa91a66e2ca313bf06991d
+SHA512 (firefox-51.0.source.tar.xz) = 4406f840a7a2b4e76a74e846d702b717618fb5b677f1c6df864c3428033dd22aad295d656f1fc57e581fd202d894c5483a16691a60b6ca7710315b157b812467
+SHA512 (firefox-langpacks-51.0-20170119.tar.xz) = 8ed16108d9148066347aa31fd8702f9f2f285c9ffc071aa9091c9b8eb38b562f3eb298faddddbe5efa81749ea98c7e27497e1bac11d7193fde93ffd751f56fd2