diff --git a/widget/src/gtk2/Makefile.in b/widget/src/gtk2/Makefile.in
--- a/widget/src/gtk2/Makefile.in
+++ b/widget/src/gtk2/Makefile.in
@@ -140,16 +140,22 @@ EXTRA_DSO_LDOPTS += \
 		$(XLIBS) \
 		$(XEXT_LIBS) \
 		$(XCOMPOSITE_LIBS) \
 		$(MOZ_GTK2_LIBS) \
 		-lthebes \
 		$(LCMS_LIBS) \
 		$(NULL)
 
+ifdef MOZ_PLATFORM_HILDON
+ifdef MOZ_ENABLE_GCONF
+EXTRA_DSO_LDOPTS += $(MOZ_GCONF_LIBS)
+endif
+endif
+
 ifdef MOZ_X11
 EXTRA_DSO_LDOPTS += -lgtkxtbin -lXrender
 endif
 
 EXPORTS		= \
                 nsGTKToolkit.h \
 		nsIImageToPixbuf.h \
 		mozdrawingarea.h \
@@ -162,16 +168,22 @@ DEFINES		+= -DNATIVE_THEME_SUPPORT
 DEFINES		+= -DNATIVE_THEME_SUPPORT
 endif
 
 include $(topsrcdir)/config/rules.mk
 
 CFLAGS          += $(MOZ_GTK2_CFLAGS) $(MOZ_STARTUP_NOTIFICATION_CFLAGS)
 CXXFLAGS        += $(MOZ_GTK2_CFLAGS) $(MOZ_STARTUP_NOTIFICATION_CFLAGS)
 
+ifdef MOZ_PLATFORM_HILDON
+ifdef MOZ_ENABLE_GCONF
+CXXFLAGS += $(MOZ_GCONF_CFLAGS)
+endif
+endif
+
 DEFINES         += -DUSE_XIM
 DEFINES		+= -DCAIRO_GFX
 
 ifdef MOZ_ENABLE_POSTSCRIPT
 DEFINES         += -DUSE_POSTSCRIPT
 EXTRA_DSO_LDOPTS += -lgfxpsshar
 endif
 
diff --git a/widget/src/gtk2/nsWindow.cpp b/widget/src/gtk2/nsWindow.cpp
--- a/widget/src/gtk2/nsWindow.cpp
+++ b/widget/src/gtk2/nsWindow.cpp
@@ -112,16 +112,23 @@ static const char sAccessibilityKey [] =
 #include "nsAutoPtr.h"
 
 #include "gfxPlatformGtk.h"
 #include "gfxContext.h"
 #include "gfxImageSurface.h"
 
 #ifdef MOZ_X11
 #include "gfxXlibSurface.h"
+#endif
+
+#if defined(MOZ_PLATFORM_HILDON) && defined(MOZ_ENABLE_GCONF)
+#include "gconf/gconf-client.h"
+static PRBool gWidgetCompletionEnabled = PR_FALSE;
+static const char sWidgetCompletionGConfPref [] =
+    "/apps/osso/inputmethod/hildon-im-languages/en_GB/word-completion";
 #endif
 
 #ifdef MOZ_DFB
 extern "C" {
 #ifdef MOZ_DIRECT_DEBUG
 #define DIRECT_ENABLE_DEBUG
 #endif
 
@@ -2808,19 +2815,43 @@ nsWindow::OnContainerFocusInEvent(GtkWid
     // Return if someone has blocked events for this widget.  This will
     // happen if someone has called gtk_widget_grab_focus() from
     // nsWindow::SetFocus() and will prevent recursion.
     if (mContainerBlockFocus) {
         LOGFOCUS(("Container focus is blocked [%p]\n", (void *)this));
         return;
     }
 
-    if (mIsTopLevel)
+    if (mIsTopLevel) {
         mActivatePending = PR_TRUE;
-
+#if defined(MOZ_PLATFORM_HILDON) && defined(MOZ_ENABLE_GCONF)
+        // For mobile/maemo, it is desired to disable the word completion widget
+        // at the bottom of the screen for some reasons: it interacts badly with
+        // keyboard events sometimes and disabling it will give more screen space
+        // for web content. So whenever a topLevel mobile window gets the focus we
+        // verify what is the current state of the widget-completion through query
+        // the proper gconf property. If it is enabled, we store the property value
+        // and disable it. Where the toplevel window loses the focus we restore the
+        // previous state of the widget completion property so other applications in
+        // the system do not get affected. See 'OnContainerFocusOutEvent'.
+        if (mWindowType == eWindowType_toplevel)
+            if (GConfClient *gConfClient = gconf_client_get_default()) {
+                GError* error = nsnull;
+                gWidgetCompletionEnabled = gconf_client_get_bool(gConfClient,
+                                                                 sWidgetCompletionGConfPref,
+                                                                 &error);
+                if (error)
+                    g_error_free(error);
+                else if (gWidgetCompletionEnabled)
+                    gconf_client_set_bool(gConfClient, sWidgetCompletionGConfPref,
+                                          PR_FALSE, nsnull);
+                g_object_unref(gConfClient);
+            }
+#endif
+    }
     // Unset the urgency hint, if possible
     GtkWidget* top_window = nsnull;
     GetToplevelWidget(&top_window);
     if (top_window && (GTK_WIDGET_VISIBLE(top_window)))
         SetUrgencyHint(top_window, PR_FALSE);
 
     // dispatch a got focus event
     DispatchGotFocusEvent();
@@ -2849,16 +2880,26 @@ nsWindow::OnContainerFocusOutEvent(GtkWi
     }
 #endif /* MOZ_X11 */
 
     // Figure out if the focus widget is the child of this window.  If
     // it is, send a focus out and deactivate event for it.
     if (!gFocusWindow)
         return;
 
+#if defined(MOZ_PLATFORM_HILDON) && defined(MOZ_ENABLE_GCONF)
+    if (mIsTopLevel && mWindowType == eWindowType_toplevel)
+        if(GConfClient *gConfClient = gconf_client_get_default()) {
+            GError* error = nsnull;
+            gconf_client_set_bool(gConfClient, sWidgetCompletionGConfPref, gWidgetCompletionEnabled, &error);
+            if (error)
+                g_error_free(error);
+            g_object_unref(gConfClient);
+        }
+#endif
     GdkWindow *tmpWindow;
     tmpWindow = (GdkWindow *)gFocusWindow->GetNativeData(NS_NATIVE_WINDOW);
     nsWindow *tmpnsWindow = get_window_for_gdk_window(tmpWindow);
 
     while (tmpWindow && tmpnsWindow) {
         // found it!
         if (tmpnsWindow == this)
             goto foundit;