diff --git a/network/web/firefox/files/mozconfig b/network/web/firefox/files/mozconfig
index ae00959ce5..c7e1918d1c 100644
--- a/network/web/firefox/files/mozconfig
+++ b/network/web/firefox/files/mozconfig
@@ -6,7 +6,7 @@ ac_add_options --enable-release
 
 ac_add_options --enable-official-branding
 
-
+# System libraries
 ac_add_options --with-system-nspr
 ac_add_options --with-system-nss
 ac_add_options --with-system-icu
@@ -19,8 +19,9 @@ ac_add_options --enable-system-hunspell
 ac_add_options --enable-system-ffi
 ac_add_options --enable-system-pixman
 ac_add_options --enable-system-sqlite
-ac_add_options --enable-gstreamer=1.0
+#ac_add_options --enable-gstreamer=1.0
 
+# Features
 ac_add_options --enable-startup-notification
 ac_add_options --disable-updater
 ac_add_options --disable-crashreporter
diff --git a/network/web/firefox/files/sed43.patch b/network/web/firefox/files/sed43.patch
new file mode 100644
index 0000000000..c18048b0a8
--- /dev/null
+++ b/network/web/firefox/files/sed43.patch
@@ -0,0 +1,21 @@
+--- a/build/autoconf/icu.m4
++++ b/build/autoconf/icu.m4
+@@ -64,17 +64,17 @@ if test -n "$USE_ICU"; then
+     icudir="$_topsrcdir/intl/icu/source"
+     if test ! -d "$icudir"; then
+         icudir="$_topsrcdir/../../intl/icu/source"
+         if test ! -d "$icudir"; then
+             AC_MSG_ERROR([Cannot find the ICU directory])
+         fi
+     fi
+ 
+-    version=`sed -n 's/^[[:space:]]*#[[:space:]]*define[[:space:]][[:space:]]*U_ICU_VERSION_MAJOR_NUM[[:space:]][[:space:]]*\([0-9][0-9]*\)[[:space:]]*$/\1/p' "$icudir/common/unicode/uvernum.h"`
++    version=`sed -n 's/^[[[:space:]]]*#[[:space:]]*define[[:space:]][[:space:]]*U_ICU_VERSION_MAJOR_NUM[[:space:]][[:space:]]*\([0-9][0-9]*\)[[:space:]]*$/\1/p' "$icudir/common/unicode/uvernum.h"`
+     if test x"$version" = x; then
+        AC_MSG_ERROR([cannot determine icu version number from uvernum.h header file $lineno])
+     fi
+     MOZ_ICU_VERSION="$version"
+ 
+     # TODO: the l is actually endian-dependent
+     # We could make this set as 'l' or 'b' for little or big, respectively,
+     # but we'd need to check in a big-endian version of the file. 
diff --git a/network/web/firefox/pspec.xml b/network/web/firefox/pspec.xml
index 4b07d908c9..a836e7e298 100644
--- a/network/web/firefox/pspec.xml
+++ b/network/web/firefox/pspec.xml
@@ -15,7 +15,7 @@
         <IsA>app:gui</IsA>
         <Summary>Firefox Web Browser</Summary>
         <Description>It is more secure and faster to browse the web with Firefox web browser. You can personalize your web browser with many specifications that is not enough to explain in two sentences.</Description>
-        <Archive sha1sum="439dac5e9815ba5df6d509ebef8e29aa105b9708" type="tarxz">https://ftp.mozilla.org/pub/firefox/releases/47.0/source/firefox-47.0.source.tar.xz</Archive>
+        <Archive sha1sum="6024dc49a566ed6296ad6cd707a199d41f090176" type="tarxz">https://ftp.mozilla.org/pub/firefox/releases/50.1.0/source/firefox-50.1.0.source.tar.xz</Archive>
         <AdditionalFiles>
             <!--Our main configure script. Configure paramters are stored here.-->
             <AdditionalFile target=".mozconfig" permission="0644">mozconfig</AdditionalFile>
@@ -24,6 +24,7 @@
         <BuildDependencies>
             <Dependency>wget</Dependency>
             <Dependency>yasm</Dependency>
+            <Dependency versionFrom="58.2">icu4c-devel</Dependency>
             <Dependency>zlib-devel</Dependency>
             <Dependency>gtk3-devel</Dependency>
             <Dependency>gtk2-devel</Dependency>
@@ -47,12 +48,12 @@
             <Dependency>libevent-devel</Dependency>
             <Dependency>pulseaudio-libs-devel</Dependency>
             <Dependency>gst-plugins-base-next-devel</Dependency>
-            <Dependency versionFrom="3.22">nss-devel</Dependency>
-            <Dependency versionFrom="4.10.10">nspr-devel</Dependency>
+            <Dependency>nss-devel</Dependency>
+            <Dependency>nspr-devel</Dependency>
         </BuildDependencies>
         <Patches>
             <Patch level="1">firefox-install-dir.patch</Patch>
-            <Patch level="1">gtk3.patch</Patch>
+            <Patch level="1">sed43.patch</Patch>-->
         </Patches>
     </Source>
 
@@ -78,7 +79,7 @@
             <Dependency>sqlite</Dependency>
             <Dependency>iconcan</Dependency> <!--for <ICON></ICON>-->
             <Dependency>libXext</Dependency>
-            <Dependency>icu4c</Dependency>
+            <Dependency versionFrom="58.2">icu4c</Dependency>
             <Dependency>libvpx</Dependency>
             <Dependency>alsa-lib</Dependency>
             <Dependency>gconf</Dependency>
@@ -533,6 +534,13 @@
     </Package>
 
     <History>
+        <Update release="4">
+            <Date>2017-02-10</Date>
+            <Version>50.0</Version>
+            <Comment>Version Bump</Comment>
+            <Name>Pisi Linux Community</Name>
+            <Email>admin@pisilinux.org</Email>
+        </Update>
         <Update release="3">
             <Date>2016-06-16</Date>
             <Version>47.0</Version>