diff --git a/mozilla-791626.patch b/mozilla-791626.patch
new file mode 100644
index 0000000..c2e77ab
--- /dev/null
+++ b/mozilla-791626.patch
@@ -0,0 +1,46 @@
+# HG changeset patch
+# Parent 3523e7f7a89d7933c5f1dc8f5f22559b48ec44c4
+diff --git a/netwerk/base/src/nsIOService.cpp b/netwerk/base/src/nsIOService.cpp
+--- a/netwerk/base/src/nsIOService.cpp
++++ b/netwerk/base/src/nsIOService.cpp
+@@ -818,17 +818,18 @@ nsIOService::PrefsChanged(nsIPrefBranch 
+         if (NS_SUCCEEDED(rv)) {
+             if (mSocketTransportService)
+                 mSocketTransportService->SetAutodialEnabled(enableAutodial);
+         }
+     }
+ 
+     if (!pref || strcmp(pref, MANAGE_OFFLINE_STATUS_PREF) == 0) {
+         bool manage;
+-        if (NS_SUCCEEDED(prefs->GetBoolPref(MANAGE_OFFLINE_STATUS_PREF,
++        if (mNetworkLinkServiceInitialized &&
++            NS_SUCCEEDED(prefs->GetBoolPref(MANAGE_OFFLINE_STATUS_PREF,
+                                             &manage)))
+             SetManageOfflineStatus(manage);
+     }
+ 
+     if (!pref || strcmp(pref, NECKO_BUFFER_CACHE_COUNT_PREF) == 0) {
+         int32_t count;
+         if (NS_SUCCEEDED(prefs->GetIntPref(NECKO_BUFFER_CACHE_COUNT_PREF,
+                                            &count)))
+@@ -928,16 +929,20 @@ nsIOService::Observe(nsISupports *subjec
+     } 
+     else if (!strcmp(topic, kProfileDoChange)) { 
+         if (data && NS_LITERAL_STRING("startup").Equals(data)) {
+             // Lazy initialization of network link service (see bug 620472)
+             InitializeNetworkLinkService();
+             // Set up the initilization flag regardless the actuall result.
+             // If we fail here, we will fail always on.
+             mNetworkLinkServiceInitialized = true;
++            // And now reflect the preference setting
++            nsCOMPtr<nsIPrefBranch> prefBranch;
++            GetPrefBranch(getter_AddRefs(prefBranch));
++            PrefsChanged(prefBranch, MANAGE_OFFLINE_STATUS_PREF);
+         }
+     }
+     else if (!strcmp(topic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
+         // Remember we passed XPCOM shutdown notification to prevent any
+         // changes of the offline status from now. We must not allow going
+         // online after this point.
+         mShutdown = true;
+ 
diff --git a/thunderbird.spec b/thunderbird.spec
index a7bc5fe..18025ef 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -54,7 +54,7 @@
 Summary:        Mozilla Thunderbird mail/newsgroup client
 Name:           thunderbird
 Version:        17.0.2
-Release:        2%{?dist}
+Release:        3%{?dist}
 URL:            http://www.mozilla.org/projects/thunderbird/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Group:          Applications/Internet
@@ -73,6 +73,7 @@ Source100:      find-external-requires
 # Mozilla (XULRunner) patches
 Patch0:         thunderbird-install-dir.patch
 Patch8:         xulrunner-10.0-secondary-ipc.patch
+Patch9:         mozilla-791626.patch
 
 # Build patches
 Patch104:       xulrunner-10.0-gcc47.patch
@@ -171,6 +172,7 @@ cd %{tarballdir}
 # Mozilla (XULRunner) patches
 cd mozilla
 %patch8 -p3 -b .secondary-ipc
+%patch9 -p1 -b .791626
 %patch104 -p1 -b .gcc47
 %patch302 -p2 -b .746112
 cd ..
@@ -449,6 +451,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #===============================================================================
 
 %changelog
+* Tue Jan 15 2013 Martin Stransky <stransky@redhat.com> - 17.0.2-3
+- Added fix for NM regression (mozbz#791626)
+
 * Tue Jan 15 2013 Jan Horak <jhorak@redhat.com> - 17.0.2-2
 - Added mozilla-746112 patch to fix crash on ppc(64)