diff --git a/src/lib/3rdparty/qtwin.cpp b/src/lib/3rdparty/qtwin.cpp
index 9705ea419..b2bf2606f 100644
--- a/src/lib/3rdparty/qtwin.cpp
+++ b/src/lib/3rdparty/qtwin.cpp
@@ -65,6 +65,7 @@ static PtrDwmEnableBlurBehindWindow pDwmEnableBlurBehindWindow = 0;
 static PtrDwmExtendFrameIntoClientArea pDwmExtendFrameIntoClientArea = 0;
 static PtrDwmGetColorizationColor pDwmGetColorizationColor = 0;
 
+QHash<QWidget *, bool> widgetsBlurState = QHash<QWidget *, bool>();
 
 /*
  * Internal helper class that notifies windows if the
@@ -169,6 +170,7 @@ bool QtWin::enableBlurBehindWindow(QWidget* widget, bool enable)
         if (SUCCEEDED(hr)) {
             result = true;
             windowNotifier()->addWidget(widget);
+            widgetsBlurState.insert(widget, true);
         }
     }
 #endif
@@ -207,6 +209,7 @@ bool QtWin::extendFrameIntoClientArea(QWidget* widget, int left, int top, int ri
         if (SUCCEEDED(hr)) {
             result = true;
             windowNotifier()->addWidget(widget);
+            widgetsBlurState.insert(widget, true);
         }
         widget->setAttribute(Qt::WA_TranslucentBackground, result);
     }
@@ -257,6 +260,13 @@ bool WindowNotifier::winEvent(MSG* message, long* result)
         foreach(QWidget * widget, widgets) {
             if (widget) {
                 widget->setAttribute(Qt::WA_NoSystemBackground, compositionEnabled);
+                bool isBlur = widgetsBlurState.value(widget, false);
+                if (compositionEnabled && isBlur)
+                {
+                    // hack for fixing black background when enabling composition
+                    QtWin::enableBlurBehindWindow(widget, false);
+                    QtWin::extendFrameIntoClientArea(widget);
+                }
                 widget->update();
             }
         }
diff --git a/src/lib/app/qupzilla.cpp b/src/lib/app/qupzilla.cpp
index 5fd9c6ab9..994c8b75d 100644
--- a/src/lib/app/qupzilla.cpp
+++ b/src/lib/app/qupzilla.cpp
@@ -1454,6 +1454,11 @@ void QupZilla::fullScreen(bool make)
         bookmarksToolbar()->hide();
         m_navigationBar->hide();
         m_tabWidget->getTabBar()->hide();
+#ifdef Q_WS_WIN
+        if (m_usingTransparentBackground) {
+            QtWin::enableBlurBehindWindow(this, false);
+        }
+#endif
     }
     else {
         setWindowState(windowState() & ~Qt::WindowFullScreen);
@@ -1463,6 +1468,11 @@ void QupZilla::fullScreen(bool make)
         m_bookmarksToolbar->setVisible(m_bookmarksToolBarVisible);
         m_navigationBar->setVisible(m_navigationVisible);
         m_tabWidget->showTabBar();
+#ifdef Q_WS_WIN
+        if (m_usingTransparentBackground) {
+            QtWin::enableBlurBehindWindow(this);
+        }
+#endif
     }
 
     m_actionShowFullScreen->setChecked(make);
diff --git a/src/lib/webview/tabbedwebview.cpp b/src/lib/webview/tabbedwebview.cpp
index e897ae567..1e0cb4b78 100644
--- a/src/lib/webview/tabbedwebview.cpp
+++ b/src/lib/webview/tabbedwebview.cpp
@@ -36,6 +36,8 @@
 #include <QHostInfo>
 #include <QWebFrame>
 
+bool TabbedWebView::m_navigationVisible = false;
+
 TabbedWebView::TabbedWebView(QupZilla* mainClass, WebTab* webTab)
     : WebView(webTab)
     , p_QupZilla(mainClass)
@@ -43,7 +45,6 @@ TabbedWebView::TabbedWebView(QupZilla* mainClass, WebTab* webTab)
     , m_webTab(webTab)
     , m_menu(new Menu(this))
     , m_mouseTrack(false)
-    , m_navigationVisible(false)
     , m_hasRss(false)
     , m_rssChecked(false)
 {
diff --git a/src/lib/webview/tabbedwebview.h b/src/lib/webview/tabbedwebview.h
index 250605160..53a15be8f 100644
--- a/src/lib/webview/tabbedwebview.h
+++ b/src/lib/webview/tabbedwebview.h
@@ -98,7 +98,7 @@ private:
     Menu* m_menu;
 
     bool m_mouseTrack;
-    bool m_navigationVisible;
+    static bool m_navigationVisible;
 
     bool m_hasRss;
     bool m_rssChecked;
diff --git a/src/lib/webview/tabwidget.cpp b/src/lib/webview/tabwidget.cpp
index 1f7b3a118..bf5ed4b7d 100644
--- a/src/lib/webview/tabwidget.cpp
+++ b/src/lib/webview/tabwidget.cpp
@@ -202,7 +202,10 @@ void TabWidget::moveAddTabButton(int posX)
     int posY = (m_tabBar->height() - m_buttonAddTab->height()) / 2;
     //RTL Support
     if (QApplication::layoutDirection() == Qt::RightToLeft) {
-        posX = posX - m_buttonAddTab->width();
+        posX = qMax(posX - m_buttonAddTab->width(), m_buttonListTabs->width());
+    }
+    else {
+        posX = qMin(posX, m_tabBar->width() - m_buttonAddTab->width() - m_buttonListTabs->width());
     }
     m_buttonAddTab->move(posX, posY);
 }