diff --git a/.abf.yml b/.abf.yml
index d983cb3..07447f5 100644
--- a/.abf.yml
+++ b/.abf.yml
@@ -1,2 +1,2 @@
 sources:
-  firefox-50.0.2.source.tar.xz: 083b9a803b25064b2d7d43e289797a9f2a2e9e5d
+  firefox-50.1.0.source.tar.xz: 6024dc49a566ed6296ad6cd707a199d41f090176
diff --git a/README.urpmi b/README.urpmi
deleted file mode 100644
index 24a377e..0000000
--- a/README.urpmi
+++ /dev/null
@@ -1,19 +0,0 @@
-Note that Firefox 39 does not support encrypted access certificates 
-SSL3 with key lengths 128 and 256. This is done in order to attract
-attention to inadequate protection of the access. If you still want
-to use such certificates, set these browser configuration options
-(url about: config):
-
-security.ssl3.dhe_rsa_aes_128_sha=false
-security.ssl3.dhe_rsa_aes_256_sha=false
-
-=== Russian ===
-
-Начиная с версии 39, Firefox не поддерживает шифрованный доступ по
-сертификатам SSL3 с длиной ключа 128 и 256. Это сделано для привлечения
-внимания к недостаточной защищенности такого доступа в современных
-условиях. Если вы по-прежнему хотите использовать такие сертификаты,
-установите в конфигурации браузера (url about:config) параметры:
-
-security.ssl3.dhe_rsa_aes_128_sha=false
-security.ssl3.dhe_rsa_aes_256_sha=false
diff --git a/firefox-38.0-enable-NTLMv1.patch b/firefox-38.0-enable-NTLMv1.patch
deleted file mode 100644
index 480e5f6..0000000
--- a/firefox-38.0-enable-NTLMv1.patch
+++ /dev/null
@@ -1,11 +0,0 @@
---- mozilla-release.orig/modules/libpref/init/all.js	2015-05-14 03:57:03.000000000 +0300
-+++ mozilla-release/modules/libpref/init/all.js	2015-05-21 12:07:36.577448753 +0300
-@@ -1622,7 +1622,7 @@
- // For example, "foo.com" would match "http://www.foo.com/bar", etc.
- 
- // Force less-secure NTLMv1 when needed (NTLMv2 is the default).
--pref("network.auth.force-generic-ntlm-v1", false);
-+pref("network.auth.force-generic-ntlm-v1", true);
- 
- // This list controls which URIs can use the negotiate-auth protocol.  This
- // list should be limited to the servers you know you'll need to login to.
diff --git a/firefox-50.1-fix-glibc-check.patch b/firefox-50.1-fix-glibc-check.patch
new file mode 100644
index 0000000..8881c87
--- /dev/null
+++ b/firefox-50.1-fix-glibc-check.patch
@@ -0,0 +1,11 @@
+--- firefox-50.1.0.old/config/config.mk 2016-11-01 04:15:27.000000000 +0800
++++ firefox-50.1.0.new/config/config.mk 2017-01-01 20:40:17.313820042 +0800
+@@ -556,7 +556,7 @@
+ 
+ ifneq (,$(MOZ_LIBSTDCXX_TARGET_VERSION)$(MOZ_LIBSTDCXX_HOST_VERSION))
+ CHECK_STDCXX = $(call CHECK_SYMBOLS,$(1),GLIBCXX,libstdc++,v[1] > 3 || (v[1] == 3 && v[2] == 4 && v[3] > 16))
+-CHECK_GLIBC = $(call CHECK_SYMBOLS,$(1),GLIBC,libc,v[1] > 2 || (v[1] == 2 && v[2] > 12))
++CHECK_GLIBC = $(call CHECK_SYMBOLS,$(1),GLIBC,libc,v[1] > 2 || (v[1] == 2 && v[2] > 19))
+ endif
+ 
+ ifeq (,$(filter $(OS_TARGET),WINNT Darwin))
diff --git a/firefox.spec b/firefox.spec
index 109a485..6f236d0 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -7,7 +7,7 @@
 # This also means only STABLE upstream releases, NO betas.
 # This is a discussed topic. Please, do not flame it again.
 
-%define major 50.0.2
+%define major 50.1.0
 %define ff_epoch 0
 # (tpg) set version HERE !!!
 %define realver %{major}
@@ -18,7 +18,7 @@
 %define pluginsdir %{_libdir}/mozilla/plugins
 
 # this seems fragile, so require the exact version or later (#58754)
-%define sqlite3_version %(pkg-config --modversion sqlite3 &>/dev/null && pkg-config --modversion sqlite3 2>/dev/null || echo 0)
+#%define sqlite3_version %(pkg-config --modversion sqlite3 &>/dev/null && pkg-config --modversion sqlite3 2>/dev/null || echo 0)
 %define nss_version %(pkg-config --modversion nss &>/dev/null && pkg-config --modversion nss 2>/dev/null || echo 0)
 %define nspr_version %(pkg-config --modversion nspr &>/dev/null && pkg-config --modversion nspr 2>/dev/null |sed -e 's!\.0!!' || echo 0)
 
@@ -32,7 +32,7 @@ Summary:	Next generation web browser
 Name:		firefox
 Version:	%{major}
 Epoch:		%{ff_epoch}
-Release:	2
+Release:	1
 License:	MPLv1+
 Group:		Networking/WWW
 Url:		http://www.mozilla.com/firefox/
@@ -44,7 +44,6 @@ Source0:	https://archive.mozilla.org/pub/firefox/releases/%{realver}/source/%{na
 %endif
 Source4:	%{name}.desktop
 Source9:	kde.js
-Source1000:	README.urpmi
 # Patches for kde integration of FF 
 # http://www.rosenauer.org/hg/mozilla/summary
 Patch11:	firefox-kde.patch
@@ -52,7 +51,7 @@ Patch12:	mozilla-kde.patch
 Patch13:	mozilla-kde-background.patch
 Patch34:	xulrunner_nojit.patch
 Patch35:	firefox-37-build-with-time-independent-uuids.patch
-Patch36:	firefox-38.0-enable-NTLMv1.patch
+Patch37:	firefox-50.1-fix-glibc-check.patch
 
 # Fedora specific patches
 # Unable to install addons from https pages
@@ -74,6 +73,7 @@ BuildRequires:	pkgconfig(xscrnsaver)
 BuildRequires:	jpeg-devel
 BuildRequires:	zlib-devel
 BuildRequires:	glib2-devel
+BuildRequires:	python-devel
 BuildRequires:	pkgconfig(libIDL-2.0)
 BuildRequires:	makedepend
 BuildRequires:	nss-devel >= 2:3.24
@@ -81,10 +81,9 @@ BuildRequires:	nss-static-devel
 BuildRequires:	nspr-devel >= 2:4.12
 BuildRequires:	startup-notification-devel
 BuildRequires:	dbus-glib-devel
-BuildRequires:	pkgconfig(sqlite3) >= 3.8.10.1
+#BuildRequires:	pkgconfig(sqlite3) >= 3.8.10.1
+BuildRequires:	pkgconfig(libevent)
 %ifnarch %arm %mips
-BuildRequires:	valgrind
-BuildRequires:	pkgconfig(valgrind)
 BuildRequires:	java-rpmbuild
 BuildRequires:	java-1.8.0-openjdk-devel
 BuildRequires:	yasm >= 1.0.1
@@ -99,7 +98,6 @@ BuildRequires:	hunspell-devel
 %endif
 BuildRequires:	doxygen
 # BuildRequires:  xulrunner-devel >= %xulrunner_version%{?prel:-0.%prel}
-BuildRequires:	pkgconfig(libproxy-1.0)
 BuildRequires:	pkgconfig(alsa)
 BuildRequires:	wget
 BuildRequires:	pkgconfig(libnotify)
@@ -125,11 +123,11 @@ Provides:	%{name} = %{epoch}:%{realver}
 Provides:	mozilla-firefox = %{epoch}:%{version}-%{release}
 Provides:	webclient
 
-Requires:	%{mklibname sqlite3_ 0} >= %{sqlite3_version}
+#Requires:	%{mklibname sqlite3_ 0} >= %{sqlite3_version}
 Requires:	%{mklibname nss 3} >= 2:%{nss_version}
 Requires:	%{mklibname nspr 4} >= 2:%{nspr_version}
 Requires:	indexhtml
-Requires:       xdg-utils
+Requires:	xdg-utils
 # fixes bug #42096
 Requires:	mailcap
 %if %_use_syshunspell
@@ -163,7 +161,6 @@ windows, cookies and downloaded files.
 %{_liconsdir}/%{name}.png
 %{_datadir}/applications/*.desktop
 %{_libdir}/%{name}-%{major}*
-%{_docdir}/%{name}/README.urpmi
 #% ghost %{mozillalibdir}/defaults/profile/bookmarks.html
 %dir %{_libdir}/mozilla
 %dir %{_libdir}/mozilla/extensions
@@ -199,7 +196,7 @@ Files and macros mainly for building Firefox extensions.
 %endif
 %endif
 %patch35 -p1
-%patch36 -p1
+%patch37 -p1
 
 # Fedora patches
 %patch204 -p2 -b .966424
@@ -217,6 +214,12 @@ perl ./certdata.perl < /etc/pki/tls/mozilla/certdata.txt
 popd
 
 %build
+
+CFLAGS="$CFLAGS -Wno-error=coverage-mismatch -Wno-error=free-nonheap-object"
+CXXFLAGS="$CFLAGS -Wno-error=coverage-mismatch -Wno-error=free-nonheap-object"
+export CFLAGS
+export CXXFLAGS
+
 export MOZCONFIG=`pwd`/mozconfig
 cat << EOF > $MOZCONFIG
 mk_add_options MOZILLA_OFFICIAL=1
@@ -224,13 +227,18 @@ mk_add_options BUILD_OFFICIAL=1
 mk_add_options MOZ_MAKE_FLAGS="%{_smp_mflags}"
 mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/../obj
 ac_add_options --host=%{_host}
-ac_add_options --target=%{_target_platform}
-ac_add_options --enable-optimize
+ac_add_options --target=i686-rosa-linux-gnu
+#ac_add_options --target=%{_target_platform}
+ac_add_options --enable-release
+ac_add_options --enable-ipc-fuzzer
 ac_add_options --prefix="%{_prefix}"
 ac_add_options --libdir="%{_libdir}"
 ac_add_options --with-system-nspr
 ac_add_options --with-system-nss
 ac_add_options --with-system-zlib
+ac_add_options --with-system-jpeg
+ac_add_options --with-pthreads
+ac_add_options --with-system-libevent
 ac_add_options --without-system-libvpx
 ac_add_options --with-system-bz2
 ac_add_options --enable-gio
@@ -242,24 +250,11 @@ ac_add_options --enable-default-toolkit=cairo-gtk3
 ac_add_options --enable-default-toolkit=cairo-gtk2
 %endif
 ac_add_options --enable-official-branding
-ac_add_options --enable-libproxy
-ac_add_options --with-system-jpeg
-ac_add_options --disable-system-cairo
-ac_add_options --enable-system-sqlite
+ac_add_options --disable-system-sqlite
 ac_add_options --enable-startup-notification
 ac_add_options --with-distribution-id=org.rosa
 ac_add_options --disable-crashreporter
 ac_add_options --enable-update-channel=%{update_channel}
-%ifarch %{arm}
-%if "%{_target_cpu}" != "armv7l"
-ac_add_options --disable-methodjit
-ac_add_options --disable-tracejit
-%endif
-ac_add_options --enable-system-ffi
-%endif
-%ifnarch %{arm} %{mips}
-ac_add_options --with-valgrind
-%endif
 
 EOF
 
@@ -372,7 +367,6 @@ cat <<FIN >%{buildroot}%{_sys_macros_dir}/%{name}.macros
 FIN
 
 mkdir -p %{buildroot}%{_docdir}/%{name}
-install -p -m755 %{SOURCE1000} %{buildroot}%{_docdir}/%{name}
 
 %pre
 if [ -d %{mozillalibdir}/browser/dictionaries ]; then