diff --git a/firefox-fedora-ua.patch b/firefox-fedora-ua.patch
new file mode 100644
index 0000000..a5b7866
--- /dev/null
+++ b/firefox-fedora-ua.patch
@@ -0,0 +1,21 @@
+diff -up firefox-35.0.1/mozilla-release/media/webrtc/trunk/Makefile.old firefox-35.0.1/mozilla-release/media/webrtc/trunk/Makefile
+diff -up firefox-35.0.1/mozilla-release/netwerk/protocol/http/nsHttpHandler.cpp.old firefox-35.0.1/mozilla-release/netwerk/protocol/http/nsHttpHandler.cpp
+--- firefox-35.0.1/mozilla-release/netwerk/protocol/http/nsHttpHandler.cpp.old	2015-01-23 07:00:06.000000000 +0100
++++ firefox-35.0.1/mozilla-release/netwerk/protocol/http/nsHttpHandler.cpp	2015-02-09 16:40:42.983220596 +0100
+@@ -607,7 +607,7 @@ nsHttpHandler::BuildUserAgent()
+     mUserAgent.SetCapacity(mLegacyAppName.Length() +
+                            mLegacyAppVersion.Length() +
+ #ifndef UA_SPARE_PLATFORM
+-                           mPlatform.Length() +
++                           mPlatform.Length() + 8 +
+ #endif
+                            mOscpu.Length() +
+                            mMisc.Length() +
+@@ -631,6 +631,7 @@ nsHttpHandler::BuildUserAgent()
+     if (!mPlatform.IsEmpty()) {
+       mUserAgent += mPlatform;
+       mUserAgent.AppendLiteral("; ");
++      mUserAgent.AppendLiteral("Fedora; ");
+     }
+ #endif
+     if (!mCompatDevice.IsEmpty()) {
diff --git a/firefox.spec b/firefox.spec
index d65cb3d..b5c18d1 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -107,7 +107,7 @@
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
 Version:        35.0.1
-Release:        4%{?pre_tag}%{?dist}
+Release:        5%{?pre_tag}%{?dist}
 URL:            http://www.mozilla.org/projects/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Group:          Applications/Internet
@@ -140,6 +140,7 @@ Patch204:        rhbz-966424.patch
 Patch215:        firefox-enable-addons.patch
 Patch219:        rhbz-1173156.patch
 Patch220:        rhbz-1014858.patch
+Patch221:        firefox-fedora-ua.patch
 
 # Upstream patches
 Patch300:        mozilla-858919.patch
@@ -295,6 +296,7 @@ cd %{tarballdir}
 %patch215 -p1 -b .addons
 %patch219 -p2 -b .rhbz-1173156
 %patch220 -p1 -b .rhbz-1014858
+%patch221 -p2 -b .fedora-ua
 
 # Upstream patches
 %patch300 -p1 -b .858919
@@ -764,6 +766,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
+* Mon Feb 9 2015 Martin Stransky <stransky@redhat.com> - 35.0.1-5
+- Fixed rhbz#1190774 - update usear agent string for Fedora
+
 * Wed Feb 04 2015 Petr Machata <pmachata@redhat.com> - 35.0.1-4
 - Bump for rebuild.