diff --git a/QupZilla.pro b/QupZilla.pro
index 775422fc6..2df11d4a0 100644
--- a/QupZilla.pro
+++ b/QupZilla.pro
@@ -14,5 +14,10 @@ lessThan(QT_VERSION, 4.7) {
 mac|unix: system(test -d bin/plugins || mkdir bin/plugins)
 
 TEMPLATE = subdirs
-SUBDIRS = src/lib src/main src/plugins
+SUBDIRS = src/lib src/main
 CONFIG += ordered
+
+# TODO: Fix plugins for Qt5
+!isEqual(QT_MAJOR_VERSION, 5) {
+    SUBDIRS += src/plugins
+}
diff --git a/src/lib/3rdparty/fancytabwidget.cpp b/src/lib/3rdparty/fancytabwidget.cpp
index 78180be25..7b6829b3a 100644
--- a/src/lib/3rdparty/fancytabwidget.cpp
+++ b/src/lib/3rdparty/fancytabwidget.cpp
@@ -45,7 +45,7 @@
 #include <QToolButton>
 #include <QToolTip>
 #include <QVBoxLayout>
-#include <QWindowsStyle>
+//#include <QWindowsStyle>
 
 using namespace Core;
 using namespace Internal;
@@ -250,7 +250,7 @@ FancyTabBar::FancyTabBar(QWidget* parent)
     : QWidget(parent)
 {
     setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Expanding);
-    setStyle(new QWindowsStyle);
+    //setStyle(new QWindowsStyle);
     setMinimumWidth(qMax(2 * m_rounding, 40));
     setAttribute(Qt::WA_Hover, true);
     setFocusPolicy(Qt::NoFocus);
diff --git a/src/lib/3rdparty/lineedit.cpp b/src/lib/3rdparty/lineedit.cpp
index 5ff65fad0..62e7a20d2 100644
--- a/src/lib/3rdparty/lineedit.cpp
+++ b/src/lib/3rdparty/lineedit.cpp
@@ -86,7 +86,8 @@ void LineEdit::init()
     mainLayout->addWidget(m_leftWidget, 0, Qt::AlignVCenter | Qt::AlignLeft);
     mainLayout->addItem(horizontalSpacer);
     mainLayout->addWidget(m_rightWidget, 0, Qt::AlignVCenter | Qt::AlignRight);
-    //by this we undo reversing of layout when direction is RTL. //TODO: don't do this and show reversed icon when needed
+    // by this we undo reversing of layout when direction is RTL.
+    // TODO: don't do this and show reversed icon when needed
     mainLayout->setDirection(isRightToLeft() ? QBoxLayout::RightToLeft : QBoxLayout::LeftToRight);
 
     setWidgetSpacing(3);
diff --git a/src/lib/3rdparty/qtsingleapplication.cpp b/src/lib/3rdparty/qtsingleapplication.cpp
index 76043da73..6aa38cd94 100644
--- a/src/lib/3rdparty/qtsingleapplication.cpp
+++ b/src/lib/3rdparty/qtsingleapplication.cpp
@@ -47,7 +47,7 @@
 
 #include "qtsingleapplication.h"
 #include "qtlocalpeer.h"
-#include <QtGui/QWidget>
+#include <QWidget>
 
 
 /*!
@@ -179,20 +179,6 @@ QtSingleApplication::QtSingleApplication(const QString &appId, int &argc, char**
     sysInit(appId);
 }
 
-
-/*!
-    Creates a QtSingleApplication object. The application identifier
-    will be QCoreApplication::applicationFilePath(). \a argc, \a
-    argv, and \a type are passed on to the QAppliation constructor.
-*/
-QtSingleApplication::QtSingleApplication(int &argc, char** argv, Type type)
-    : QApplication(argc, argv, type)
-    , peer(0)
-    , actWin(0)
-{
-}
-
-
 #if defined(Q_WS_X11)
 /*!
   Special constructor for X11, ref. the documentation of
diff --git a/src/lib/3rdparty/qtsingleapplication.h b/src/lib/3rdparty/qtsingleapplication.h
index 8734d0d94..0532656c1 100644
--- a/src/lib/3rdparty/qtsingleapplication.h
+++ b/src/lib/3rdparty/qtsingleapplication.h
@@ -45,7 +45,7 @@
 ****************************************************************************/
 
 
-#include <QtGui/QApplication>
+#include <QApplication>
 
 class QtLocalPeer;
 
@@ -72,7 +72,6 @@ class QT_QTSINGLEAPPLICATION_EXPORT QtSingleApplication : public QApplication
 public:
     QtSingleApplication(int &argc, char** argv, bool GUIenabled = true);
     QtSingleApplication(const QString &id, int &argc, char** argv);
-    QtSingleApplication(int &argc, char** argv, Type type);
 #if defined(Q_WS_X11)
     QtSingleApplication(Display* dpy, Qt::HANDLE visual = 0, Qt::HANDLE colormap = 0);
     QtSingleApplication(Display* dpy, int &argc, char** argv, Qt::HANDLE visual = 0, Qt::HANDLE cmap = 0);
diff --git a/src/lib/3rdparty/squeezelabelv2.cpp b/src/lib/3rdparty/squeezelabelv2.cpp
index 0e371f285..5059438d8 100644
--- a/src/lib/3rdparty/squeezelabelv2.cpp
+++ b/src/lib/3rdparty/squeezelabelv2.cpp
@@ -20,6 +20,8 @@
 #include <QApplication>
 #include <QClipboard>
 #include <QKeyEvent>
+#include <QMimeData>
+#include <QDrag>
 #include <QMenu>
 
 SqueezeLabelV2::SqueezeLabelV2(QWidget* parent)
diff --git a/src/lib/3rdparty/stylehelper.cpp b/src/lib/3rdparty/stylehelper.cpp
index 52c5c860b..5aba52a4a 100644
--- a/src/lib/3rdparty/stylehelper.cpp
+++ b/src/lib/3rdparty/stylehelper.cpp
@@ -29,13 +29,13 @@
 
 #include "stylehelper.h"
 
-#include <QtGui/QPixmapCache>
-#include <QtGui/QWidget>
+#include <QPixmapCache>
+#include <QWidget>
 #include <QtCore/QRect>
-#include <QtGui/QPainter>
-#include <QtGui/QApplication>
-#include <QtGui/QPalette>
-#include <QtGui/QStyleOption>
+#include <QPainter>
+#include <QApplication>
+#include <QPalette>
+#include <QStyleOption>
 #include <QtCore/QObject>
 
 // Clamps float color values within (0, 255)
diff --git a/src/lib/3rdparty/stylehelper.h b/src/lib/3rdparty/stylehelper.h
index c1a52c819..c97144678 100644
--- a/src/lib/3rdparty/stylehelper.h
+++ b/src/lib/3rdparty/stylehelper.h
@@ -32,8 +32,8 @@
 
 #include "qz_namespace.h"
 
-#include <QtGui/QColor>
-#include <QtGui/QStyle>
+#include <QColor>
+#include <QStyle>
 
 QT_BEGIN_NAMESPACE
 class QPalette;
diff --git a/src/lib/adblock/adblockmanager.cpp b/src/lib/adblock/adblockmanager.cpp
index cc1eb45c3..d00681cdb 100644
--- a/src/lib/adblock/adblockmanager.cpp
+++ b/src/lib/adblock/adblockmanager.cpp
@@ -131,7 +131,7 @@ AdBlockSubscription* AdBlockManager::addSubscription(const QString &title, const
     QString fileName = qz_filterCharsFromFilename(title.toLower()) + ".txt";
     QString filePath = qz_ensureUniqueFilename(mApp->currentProfilePath() + "adblock/" + fileName);
 
-    QByteArray data = QString("Title: %1\nUrl: %2\n[Adblock Plus 1.1.1]").arg(title, url).toAscii();
+    QByteArray data = QString("Title: %1\nUrl: %2\n[Adblock Plus 1.1.1]").arg(title, url).toLatin1();
 
     QFile file(filePath);
     if (!file.open(QFile::WriteOnly | QFile::Truncate)) {
diff --git a/src/lib/adblock/adblockmanager.h b/src/lib/adblock/adblockmanager.h
index 5051c28f4..2c3e1cd2b 100644
--- a/src/lib/adblock/adblockmanager.h
+++ b/src/lib/adblock/adblockmanager.h
@@ -20,7 +20,7 @@
 
 #include <QObject>
 #include <QStringList>
-#include <QWeakPointer>
+#include <QPointer>
 
 #include "qz_namespace.h"
 
@@ -81,7 +81,7 @@ private:
     QList<AdBlockSubscription*> m_subscriptions;
     QStringList m_disabledRules;
 
-    QWeakPointer<AdBlockDialog> m_adBlockDialog;
+    QPointer<AdBlockDialog> m_adBlockDialog;
 };
 
 #endif // ADBLOCKMANAGER_H
diff --git a/src/lib/app/commandlineoptions.h b/src/lib/app/commandlineoptions.h
index b3c6be2e4..c9e6d8b5b 100644
--- a/src/lib/app/commandlineoptions.h
+++ b/src/lib/app/commandlineoptions.h
@@ -19,6 +19,8 @@
 #define COMMANDLINEOPTIONS_H
 
 #include <QPair>
+#include <QString>
+#include <QList>
 #include <iostream>
 
 #include "qz_namespace.h"
diff --git a/src/lib/app/mainapplication.cpp b/src/lib/app/mainapplication.cpp
index af6bbbe72..bf75aa214 100644
--- a/src/lib/app/mainapplication.cpp
+++ b/src/lib/app/mainapplication.cpp
@@ -866,7 +866,7 @@ QUrl MainApplication::userStyleSheet(const QString &filePath) const
         file.close();
     }
 
-    const QString &encodedStyle = userStyle.toAscii().toBase64();
+    const QString &encodedStyle = userStyle.toLatin1().toBase64();
     const QString &dataString = QString("data:text/css;charset=utf-8;base64,%1").arg(encodedStyle);
 
     return QUrl(dataString);
diff --git a/src/lib/app/mainapplication.h b/src/lib/app/mainapplication.h
index 61e3c988c..20989dcd3 100644
--- a/src/lib/app/mainapplication.h
+++ b/src/lib/app/mainapplication.h
@@ -22,7 +22,7 @@
 
 #include <QList>
 #include <QUrl>
-#include <QWeakPointer>
+#include <QPointer>
 
 #include "restoremanager.h"
 #include "qtsingleapplication.h"
@@ -164,7 +164,7 @@ private:
     DatabaseWriter* m_dbWriter;
     UserAgentManager* m_uaManager;
 
-    QList<QWeakPointer<QupZilla> > m_mainWindows;
+    QList<QPointer<QupZilla> > m_mainWindows;
 
     QString m_activeProfil;
     QString m_activeLanguage;
diff --git a/src/lib/app/qupzilla.cpp b/src/lib/app/qupzilla.cpp
index fbda28124..4fcf8ce26 100644
--- a/src/lib/app/qupzilla.cpp
+++ b/src/lib/app/qupzilla.cpp
@@ -87,6 +87,10 @@
 #include <X11/Xatom.h>
 #endif
 
+#if QT_VERSION < 0x050000
+#include "qwebkitversion.h"
+#endif
+
 const QString QupZilla::VERSION = "1.3.5";
 const QString QupZilla::BUILDTIME =  __DATE__" "__TIME__;
 const QString QupZilla::AUTHOR = "David Rosca";
@@ -1842,7 +1846,7 @@ void QupZilla::disconnectObjects()
         tab->view()->page()->disconnectObjects();
     }
 
-    foreach(const QWeakPointer<QWidget> &pointer, m_deleteOnCloseWidgets) {
+    foreach(const QPointer<QWidget> &pointer, m_deleteOnCloseWidgets) {
         if (pointer) {
             pointer.data()->deleteLater();
         }
diff --git a/src/lib/app/qupzilla.h b/src/lib/app/qupzilla.h
index 908a3a585..b997a92d8 100644
--- a/src/lib/app/qupzilla.h
+++ b/src/lib/app/qupzilla.h
@@ -20,7 +20,6 @@
 
 #include <QMainWindow>
 #include <QUrl>
-#include "qwebkitversion.h"
 
 #include "restoremanager.h"
 #include "qz_namespace.h"
@@ -265,11 +264,11 @@ private:
 
     QLabel* m_privateBrowsing;
     AdBlockIcon* m_adblockIcon;
-    QWeakPointer<WebInspectorDockWidget> m_webInspectorDock;
+    QPointer<WebInspectorDockWidget> m_webInspectorDock;
 
     BookmarksToolbar* m_bookmarksToolbar;
     TabWidget* m_tabWidget;
-    QWeakPointer<SideBar> m_sideBar;
+    QPointer<SideBar> m_sideBar;
     SideBarManager* m_sideBarManager;
     StatusBarMessage* m_statusBarMessage;
     NavigationBar* m_navigationBar;
@@ -294,7 +293,7 @@ private:
     bool m_navigationVisible;
     bool m_bookmarksToolBarVisible;
 
-    QList<QWeakPointer<QWidget> > m_deleteOnCloseWidgets;
+    QList<QPointer<QWidget> > m_deleteOnCloseWidgets;
 };
 
 #endif // QUPZILLA_H
diff --git a/src/lib/autofill/autofillmodel.cpp b/src/lib/autofill/autofillmodel.cpp
index 87283e6dd..ed6644355 100644
--- a/src/lib/autofill/autofillmodel.cpp
+++ b/src/lib/autofill/autofillmodel.cpp
@@ -30,6 +30,10 @@
 #include <QWebFrame>
 #include <QNetworkRequest>
 
+#if QT_VERSION >= 0x050000
+#include <QUrlQuery>
+#endif
+
 AutoFillModel::AutoFillModel(QupZilla* mainClass, QObject* parent)
     : QObject(parent)
     , p_QupZilla(mainClass)
@@ -224,8 +228,11 @@ void AutoFillModel::completePage(WebPage* page)
     // Why not to use encodedQueryItems = QByteArrays ?
     // Because we need to filter "+" characters that must be spaces
     // (not real "+" characters "%2B")
-
+#if QT_VERSION >= 0x050000
+    QueryItems arguments = QUrlQuery(QUrl::fromEncoded("http://bla.com/?" + data)).queryItems();
+#else
     QueryItems arguments = QUrl::fromEncoded("http://bla.com/?" + data).queryItems();
+#endif
     for (int i = 0; i < arguments.count(); i++) {
         QString key = arguments.at(i).first;
         QString value = arguments.at(i).second;
@@ -345,7 +352,11 @@ QString AutoFillModel::getValueFromData(const QByteArray &data, QWebElement elem
 
     QString value = element.evaluateJavaScript("this.value").toString();
     if (value.isEmpty()) {
+#if QT_VERSION >= 0x050000
+        QueryItems queryItems = QUrlQuery(QUrl::fromEncoded("http://a.b/?" + data)).queryItems();
+#else
         QueryItems queryItems = QUrl::fromEncoded("http://a.b/?" + data).queryItems();
+#endif
         for (int i = 0; i < queryItems.count(); i++) {
             QueryItem item = queryItems.at(i);
 
@@ -404,7 +415,11 @@ QByteArray AutoFillModel::convertWebKitFormBoundaryIfNecessary(const QByteArray
 
 bool AutoFillModel::dataContains(const QByteArray &data, const QString &attributeName)
 {
+#if QT_VERSION >= 0x050000
+    QueryItems queryItems = QUrlQuery(QUrl::fromEncoded("http://a.b/?" + data)).queryItems();
+#else
     QueryItems queryItems = QUrl::fromEncoded("http://a.b/?" + data).queryItems();
+#endif
 
     for (int i = 0; i < queryItems.count(); i++) {
         QueryItem item = queryItems.at(i);
diff --git a/src/lib/autofill/autofillmodel.h b/src/lib/autofill/autofillmodel.h
index aa431c3aa..437be38fd 100644
--- a/src/lib/autofill/autofillmodel.h
+++ b/src/lib/autofill/autofillmodel.h
@@ -18,6 +18,7 @@
 #ifndef AUTOFILLMODEL_H
 #define AUTOFILLMODEL_H
 
+#include <QObject>
 #include <QPair>
 
 #include "qz_namespace.h"
diff --git a/src/lib/bookmarks/bookmarksmanager.cpp b/src/lib/bookmarks/bookmarksmanager.cpp
index de6f916eb..50e978d51 100644
--- a/src/lib/bookmarks/bookmarksmanager.cpp
+++ b/src/lib/bookmarks/bookmarksmanager.cpp
@@ -169,7 +169,7 @@ void BookmarksManager::changeIcon()
     QIcon icon;
 
     IconChooser chooser(this);
-    icon = chooser.exec();
+    icon = chooser.getIcon();
 
     if (!icon.isNull()) {
         m_bookmarksModel->changeIcon(id, icon);
diff --git a/src/lib/bookmarks/bookmarksmanager.h b/src/lib/bookmarks/bookmarksmanager.h
index 272814cda..76f9dfdd2 100644
--- a/src/lib/bookmarks/bookmarksmanager.h
+++ b/src/lib/bookmarks/bookmarksmanager.h
@@ -19,7 +19,7 @@
 #define BOOKMARKSMANAGER_H
 
 #include <QWidget>
-#include <QWeakPointer>
+#include <QPointer>
 
 #include "bookmarksmodel.h"
 #include "qz_namespace.h"
@@ -84,7 +84,7 @@ private:
 
     bool m_isRefreshing;
     Ui::BookmarksManager* ui;
-    QWeakPointer<QupZilla> p_QupZilla;
+    QPointer<QupZilla> p_QupZilla;
     BookmarksModel* m_bookmarksModel;
 };
 
diff --git a/src/lib/cookies/cookiejar.cpp b/src/lib/cookies/cookiejar.cpp
index e7f682940..e729f06cf 100644
--- a/src/lib/cookies/cookiejar.cpp
+++ b/src/lib/cookies/cookiejar.cpp
@@ -20,6 +20,7 @@
 #include "mainapplication.h"
 #include "settings.h"
 
+#include <QNetworkCookie>
 #include <QDateTime>
 #include <QDebug>
 
diff --git a/src/lib/cookies/cookiemanager.cpp b/src/lib/cookies/cookiemanager.cpp
index 199a74a1d..4d3a7271a 100644
--- a/src/lib/cookies/cookiemanager.cpp
+++ b/src/lib/cookies/cookiemanager.cpp
@@ -23,6 +23,7 @@
 #include "globalfunctions.h"
 #include "settings.h"
 
+#include <QNetworkCookie>
 #include <QMessageBox>
 #include <QDateTime>
 #include <QShortcut>
@@ -153,7 +154,7 @@ void CookieManager::slotRefreshTable()
     ui->cookieTree->clear();
 
     int counter = 0;
-    QWeakPointer<CookieManager> guard = this;
+    QPointer<CookieManager> guard = this;
     QHash<QString, QTreeWidgetItem*> hash;
     for (int i = 0; i < allCookies.count(); ++i) {
         const QNetworkCookie &cookie = allCookies.at(i);
diff --git a/src/lib/desktopnotifications/desktopnotificationsfactory.h b/src/lib/desktopnotifications/desktopnotificationsfactory.h
index 83a127af0..d03651ea8 100644
--- a/src/lib/desktopnotifications/desktopnotificationsfactory.h
+++ b/src/lib/desktopnotifications/desktopnotificationsfactory.h
@@ -22,7 +22,7 @@
 
 #include <QObject>
 #include <QPoint>
-#include <QWeakPointer>
+#include <QPointer>
 
 class QPixmap;
 
@@ -48,7 +48,7 @@ private:
     Type m_notifType;
     QPoint m_position;
 
-    QWeakPointer<DesktopNotification> m_desktopNotif;
+    QPointer<DesktopNotification> m_desktopNotif;
     quint32 m_uint;
 };
 
diff --git a/src/lib/downloads/downloadfilehelper.cpp b/src/lib/downloads/downloadfilehelper.cpp
index e805b3c98..93258d847 100644
--- a/src/lib/downloads/downloadfilehelper.cpp
+++ b/src/lib/downloads/downloadfilehelper.cpp
@@ -32,7 +32,12 @@
 #include <QWebHistory>
 #include <QDebug>
 #include <QFileDialog>
+
+#if QT_VERSION >= 0x050000
+#include <QStandardPaths>
+#else
 #include <QDesktopServices>
+#endif
 
 DownloadFileHelper::DownloadFileHelper(const QString &lastDownloadPath, const QString &downloadPath, bool useNativeDialog)
     : QObject()
@@ -165,12 +170,22 @@ void DownloadFileHelper::optionsDialogAccepted(int finish)
                 dialog->selectFile(m_h_fileName);
 
                 QList<QUrl> urls;
-                urls << QUrl::fromLocalFile(QDesktopServices::storageLocation(QDesktopServices::HomeLocation))
+                urls <<
+#if QT_VERSION >= 0x050000
+                     QUrl::fromLocalFile(QStandardPaths::writableLocation(QStandardPaths::HomeLocation))
+                     << QUrl::fromLocalFile(QStandardPaths::writableLocation(QStandardPaths::DesktopLocation))
+                     << QUrl::fromLocalFile(QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation))
+                     << QUrl::fromLocalFile(QStandardPaths::writableLocation(QStandardPaths::PicturesLocation))
+                     << QUrl::fromLocalFile(QStandardPaths::writableLocation(QStandardPaths::MusicLocation))
+                     << QUrl::fromLocalFile(QStandardPaths::writableLocation(QStandardPaths::MoviesLocation));
+#else
+                     QUrl::fromLocalFile(QDesktopServices::storageLocation(QDesktopServices::HomeLocation))
                      << QUrl::fromLocalFile(QDesktopServices::storageLocation(QDesktopServices::DesktopLocation))
                      << QUrl::fromLocalFile(QDesktopServices::storageLocation(QDesktopServices::DocumentsLocation))
                      << QUrl::fromLocalFile(QDesktopServices::storageLocation(QDesktopServices::PicturesLocation))
                      << QUrl::fromLocalFile(QDesktopServices::storageLocation(QDesktopServices::MusicLocation))
                      << QUrl::fromLocalFile(QDesktopServices::storageLocation(QDesktopServices::MoviesLocation));
+#endif
                 dialog->setSidebarUrls(urls);
 
                 dialog->show();
diff --git a/src/lib/history/historymanager.h b/src/lib/history/historymanager.h
index 401a3aa1e..66793756f 100644
--- a/src/lib/history/historymanager.h
+++ b/src/lib/history/historymanager.h
@@ -19,7 +19,7 @@
 #define HISTORYMANAGER_H
 
 #include <QWidget>
-#include <QWeakPointer>
+#include <QPointer>
 
 #include "qz_namespace.h"
 #include "historyview.h"
@@ -58,7 +58,7 @@ private:
     QupZilla* getQupZilla();
 
     Ui::HistoryManager* ui;
-    QWeakPointer<QupZilla> p_QupZilla;
+    QPointer<QupZilla> p_QupZilla;
 };
 
 #endif // HISTORYMANAGER_H
diff --git a/src/lib/lib.pro b/src/lib/lib.pro
index 6ac168f8e..095b1aafa 100644
--- a/src/lib/lib.pro
+++ b/src/lib/lib.pro
@@ -1,4 +1,9 @@
-QT += core gui webkit sql network script
+isEqual(QT_MAJOR_VERSION, 5) {
+    QT += webkitwidgets network widgets printsupport sql script
+} else {
+    QT += core gui webkit sql network script
+}
+
 TARGET = QupZilla
 TEMPLATE = lib
 
diff --git a/src/lib/navigation/locationbar.cpp b/src/lib/navigation/locationbar.cpp
index 4ec67c961..d50fde91c 100644
--- a/src/lib/navigation/locationbar.cpp
+++ b/src/lib/navigation/locationbar.cpp
@@ -40,6 +40,7 @@
 #include "qzsettings.h"
 #include "colors.h"
 
+#include <QMimeData>
 #include <QClipboard>
 #include <QTimer>
 #include <QContextMenuEvent>
diff --git a/src/lib/navigation/siteicon.cpp b/src/lib/navigation/siteicon.cpp
index b0809560a..67ccdf4c4 100644
--- a/src/lib/navigation/siteicon.cpp
+++ b/src/lib/navigation/siteicon.cpp
@@ -20,6 +20,8 @@
 #include "tabbedwebview.h"
 #include "globalfunctions.h"
 
+#include <QDrag>
+#include <QMimeData>
 #include <QApplication>
 #include <QContextMenuEvent>
 
diff --git a/src/lib/navigation/websearchbar.cpp b/src/lib/navigation/websearchbar.cpp
index 42a759ac3..1cad06d36 100644
--- a/src/lib/navigation/websearchbar.cpp
+++ b/src/lib/navigation/websearchbar.cpp
@@ -29,6 +29,8 @@
 #include "searchenginesdialog.h"
 #include "networkmanager.h"
 
+#include <QMimeData>
+#include <QAbstractItemView>
 #include <QCompleter>
 #include <QStringListModel>
 #include <QMenu>
diff --git a/src/lib/navigation/websearchbar.h b/src/lib/navigation/websearchbar.h
index 4f7891562..c57e476f2 100644
--- a/src/lib/navigation/websearchbar.h
+++ b/src/lib/navigation/websearchbar.h
@@ -18,7 +18,7 @@
 #ifndef WEBSEARCHBAR_H
 #define WEBSEARCHBAR_H
 
-#include <QWeakPointer>
+#include <QPointer>
 
 #include "qz_namespace.h"
 #include "lineedit.h"
@@ -91,7 +91,7 @@ private:
     WebSearchBar_Button* m_buttonSearch;
     ButtonWithMenu* m_boxSearchType;
     SearchEnginesManager* m_searchManager;
-    QWeakPointer<SearchEnginesDialog> m_searchDialog;
+    QPointer<SearchEnginesDialog> m_searchDialog;
 
     QAction* m_pasteAndGoAction;
     QAction* m_clearAction;
diff --git a/src/lib/network/networkmanager.cpp b/src/lib/network/networkmanager.cpp
index b7ad191eb..eb49d719b 100644
--- a/src/lib/network/networkmanager.cpp
+++ b/src/lib/network/networkmanager.cpp
@@ -38,7 +38,6 @@
 #include <QLineEdit>
 #include <QCheckBox>
 #include <QDialogButtonBox>
-#include <QTextDocument>
 #include <QNetworkDiskCache>
 #include <QDir>
 #include <QSslSocket>
@@ -130,7 +129,7 @@ void NetworkManager::setSSLConfiguration(QNetworkReply* reply)
 {
     if (!reply->sslConfiguration().isNull()) {
         QSslCertificate cert = reply->sslConfiguration().peerCertificate();
-        if (!cert.isValid() || reply->property("downReply").toBool()) {
+        if (!qz_isCertificateValid(cert) || reply->property("downReply").toBool()) {
             return;
         }
 
@@ -269,7 +268,7 @@ void NetworkManager::authentication(QNetworkReply* reply, QAuthenticator* auth)
     connect(box, SIGNAL(accepted()), dialog, SLOT(accept()));
 
     label->setText(tr("A username and password are being requested by %1. "
-                      "The site says: \"%2\"").arg(reply->url().toEncoded(), Qt::escape(auth->realm())));
+                      "The site says: \"%2\"").arg(reply->url().toEncoded(), qz_escape(auth->realm())));
     formLa->addRow(label);
 
     formLa->addRow(userLab, user);
diff --git a/src/lib/network/schemehandlers/adblockschemehandler.cpp b/src/lib/network/schemehandlers/adblockschemehandler.cpp
index 29c5b6d39..6374f23ab 100644
--- a/src/lib/network/schemehandlers/adblockschemehandler.cpp
+++ b/src/lib/network/schemehandlers/adblockschemehandler.cpp
@@ -22,6 +22,10 @@
 #include <QNetworkRequest>
 #include <QMessageBox>
 
+#if QT_VERSION >= 0x050000
+#include <QUrlQuery>
+#endif
+
 AdBlockSchemeHandler::AdBlockSchemeHandler()
     : SchemeHandler()
 {
@@ -36,7 +40,12 @@ QNetworkReply* AdBlockSchemeHandler::createRequest(QNetworkAccessManager::Operat
     }
 
     const QUrl &url = request.url();
-    const QList<QPair<QString, QString> > queryItems = url.queryItems();
+    const QList<QPair<QString, QString> > queryItems =
+#if QT_VERSION >= 0x050000
+        QUrlQuery(url).queryItems();
+#else
+        url.queryItems();
+#endif
 
     QString subscriptionTitle;
     QString subscriptionUrl;
diff --git a/src/lib/network/schemehandlers/qupzillaschemehandler.cpp b/src/lib/network/schemehandlers/qupzillaschemehandler.cpp
index 0397320aa..eb5b0c4f9 100644
--- a/src/lib/network/schemehandlers/qupzillaschemehandler.cpp
+++ b/src/lib/network/schemehandlers/qupzillaschemehandler.cpp
@@ -27,7 +27,6 @@
 #include "settings.h"
 #include "iconprovider.h"
 
-#include <QTextDocument>
 #include <QTextStream>
 #include <QTimer>
 #include <QSettings>
@@ -191,7 +190,7 @@ QString QupZillaSchemeReply::aboutPage()
         aPage.replace(QLatin1String("%FAVICON%"), QLatin1String("qrc:icons/qupzilla.png"));
         aPage.replace(QLatin1String("%BOX-BORDER%"), QLatin1String("qrc:html/box-border.png"));
         aPage.replace(QLatin1String("%ABOUT-IMG%"), QLatin1String("qrc:icons/other/about.png"));
-        aPage.replace(QLatin1String("%COPYRIGHT-INCLUDE%"), Qt::escape(qz_readAllFileContents(":html/copyright")));
+        aPage.replace(QLatin1String("%COPYRIGHT-INCLUDE%"), qz_escape(qz_readAllFileContents(":html/copyright")));
 
         aPage.replace(QLatin1String("%TITLE%"), tr("About QupZilla"));
         aPage.replace(QLatin1String("%ABOUT-QUPZILLA%"), tr("About QupZilla"));
@@ -420,7 +419,7 @@ QString QupZillaSchemeReply::configPage()
     foreach(const Plugins::Plugin & plugin, availablePlugins) {
         PluginSpec spec = plugin.pluginSpec;
         pluginsString.append(QString("<tr><td>%1</td><td>%2</td><td>%3</td><td>%4</td></tr>").arg(
-                                 spec.name, spec.version, Qt::escape(spec.author), spec.description));
+                                 spec.name, spec.version, qz_escape(spec.author), spec.description));
     }
 
     if (pluginsString.isEmpty()) {
@@ -462,7 +461,7 @@ QString QupZillaSchemeReply::configPage()
                 keyString = QLatin1String("\"empty\"");
             }
 
-            groupString.append(QString("<tr><td>%1</td><td>%2</td></tr>").arg(key, Qt::escape(keyString)));
+            groupString.append(QString("<tr><td>%1</td><td>%2</td></tr>").arg(key, qz_escape(keyString)));
         }
 
         settings->endGroup();
diff --git a/src/lib/opensearch/editsearchengine.cpp b/src/lib/opensearch/editsearchengine.cpp
index 7ee292097..5f3042d71 100644
--- a/src/lib/opensearch/editsearchengine.cpp
+++ b/src/lib/opensearch/editsearchengine.cpp
@@ -89,7 +89,7 @@ void EditSearchEngine::hideIconLabels()
 void EditSearchEngine::chooseIcon()
 {
     IconChooser chooser(this);
-    QIcon icon = chooser.exec();
+    QIcon icon = chooser.getIcon();
 
     if (!icon.isNull()) {
         setIcon(icon);
diff --git a/src/lib/opensearch/opensearchengine.cpp b/src/lib/opensearch/opensearchengine.cpp
index dc7a21597..bb144a26e 100644
--- a/src/lib/opensearch/opensearchengine.cpp
+++ b/src/lib/opensearch/opensearchengine.cpp
@@ -48,6 +48,11 @@
 #include <qscriptvalue.h>
 #include <qstringlist.h>
 
+#if QT_VERSION >= 0x050000
+#include <QUrlQuery>
+#endif
+
+
 /*!
     \class OpenSearchEngine
     \brief A class representing a single search engine described in OpenSearch format
@@ -226,12 +231,22 @@ QUrl OpenSearchEngine::searchUrl(const QString &searchTerm) const
 
     QUrl retVal = QUrl::fromEncoded(parseTemplate(searchTerm, m_searchUrlTemplate).toUtf8());
 
+#if QT_VERSION >= 0x050000
+    QUrlQuery query(retVal);
+#endif
     if (m_searchMethod != QLatin1String("post")) {
         Parameters::const_iterator end = m_searchParameters.constEnd();
         Parameters::const_iterator i = m_searchParameters.constBegin();
         for (; i != end; ++i) {
+#if QT_VERSION >= 0x050000
+            query.addQueryItem(i->first, parseTemplate(searchTerm, i->second));
+#else
             retVal.addQueryItem(i->first, parseTemplate(searchTerm, i->second));
+#endif
         }
+#if QT_VERSION >= 0x050000
+        retVal.setQuery(query);
+#endif
     }
 
     return retVal;
@@ -286,12 +301,22 @@ QUrl OpenSearchEngine::suggestionsUrl(const QString &searchTerm) const
 
     QUrl retVal = QUrl::fromEncoded(parseTemplate(searchTerm, m_suggestionsUrlTemplate).toUtf8());
 
+#if QT_VERSION >= 0x050000
+    QUrlQuery query(retVal);
+#endif
     if (m_suggestionsMethod != QLatin1String("post")) {
         Parameters::const_iterator end = m_suggestionsParameters.constEnd();
         Parameters::const_iterator i = m_suggestionsParameters.constBegin();
         for (; i != end; ++i) {
+#if QT_VERSION >= 0x050000
+            query.addQueryItem(i->first, parseTemplate(searchTerm, i->second));
+#else
             retVal.addQueryItem(i->first, parseTemplate(searchTerm, i->second));
+#endif
         }
+#if QT_VERSION >= 0x050000
+        retVal.setQuery(query);
+#endif
     }
 
     return retVal;
diff --git a/src/lib/opensearch/searchenginesmanager.cpp b/src/lib/opensearch/searchenginesmanager.cpp
index 049c2aca7..f6bcfd243 100644
--- a/src/lib/opensearch/searchenginesmanager.cpp
+++ b/src/lib/opensearch/searchenginesmanager.cpp
@@ -32,6 +32,10 @@
 #include <QMessageBox>
 #include <QWebElement>
 
+#if QT_VERSION >= 0x050000
+#include <QUrlQuery>
+#endif
+
 #define ENSURE_LOADED if (!m_settingsLoaded) loadSettings();
 
 QIcon SearchEnginesManager::iconForSearchEngine(const QUrl &url)
@@ -224,7 +228,21 @@ void SearchEnginesManager::addEngineFromForm(const QWebElement &element, WebView
     if (actionUrl.isRelative()) {
         actionUrl = view->url().resolved(actionUrl);
     }
+#if QT_VERSION >= 0x050000
+    QUrlQuery query(actionUrl);
+    query.addQueryItem(element.attribute("name"), "%s");
 
+    QWebElementCollection allInputs = formElement.findAll("input");
+    foreach(QWebElement e, allInputs) {
+        if (element == e || !e.hasAttribute("name")) {
+            continue;
+        }
+
+        query.addQueryItem(e.attribute("name"), e.evaluateJavaScript("this.value").toString());
+    }
+
+    actionUrl.setQuery(query);
+#else
     actionUrl.addQueryItem(element.attribute("name"), "%s");
 
     QList<QPair<QByteArray, QByteArray> > queryItems;
@@ -242,6 +260,7 @@ void SearchEnginesManager::addEngineFromForm(const QWebElement &element, WebView
     }
 
     actionUrl.setEncodedQueryItems(queryItems + actionUrl.encodedQueryItems());
+#endif
 
     SearchEngine engine;
     engine.name = view->title();
diff --git a/src/lib/other/clearprivatedata.cpp b/src/lib/other/clearprivatedata.cpp
index 6a48d5ff5..b6e8c5343 100644
--- a/src/lib/other/clearprivatedata.cpp
+++ b/src/lib/other/clearprivatedata.cpp
@@ -28,6 +28,7 @@
 #include "iconprovider.h"
 #include "globalfunctions.h"
 
+#include <QNetworkCookie>
 #include <QWebDatabase>
 #include <QWebSettings>
 #include <QNetworkDiskCache>
diff --git a/src/lib/other/iconchooser.cpp b/src/lib/other/iconchooser.cpp
index ca9ae590d..968fa6c7c 100644
--- a/src/lib/other/iconchooser.cpp
+++ b/src/lib/other/iconchooser.cpp
@@ -75,7 +75,7 @@ void IconChooser::searchIcon(const QString &string)
     }
 }
 
-QIcon IconChooser::exec()
+QIcon IconChooser::getIcon()
 {
     QIcon icon;
     int status = QDialog::exec();
diff --git a/src/lib/other/iconchooser.h b/src/lib/other/iconchooser.h
index ad7bb7502..51f153fae 100644
--- a/src/lib/other/iconchooser.h
+++ b/src/lib/other/iconchooser.h
@@ -38,7 +38,7 @@ public:
     explicit IconChooser(QWidget* parent = 0);
     ~IconChooser();
 
-    QIcon exec();
+    QIcon getIcon();
 
 private slots:
     void chooseFile();
diff --git a/src/lib/other/pagescreen.cpp b/src/lib/other/pagescreen.cpp
index 0d249a9d1..8b751b1f4 100644
--- a/src/lib/other/pagescreen.cpp
+++ b/src/lib/other/pagescreen.cpp
@@ -25,9 +25,15 @@
 #include <QWebFrame>
 #include <QTimer>
 #include <QMovie>
-#include <QtConcurrentRun>
 #include <QPushButton>
 
+#if QT_VERSION >= 0x050000
+#include <QtConcurrent/QtConcurrentRun>
+#else
+#include <QtConcurrentRun>
+#endif
+
+
 PageScreen::PageScreen(WebView* view, QWidget* parent)
     : QDialog(parent)
     , ui(new Ui::PageScreen)
diff --git a/src/lib/other/registerqappassociation.h b/src/lib/other/registerqappassociation.h
index 3b83785a9..f9a5a58df 100644
--- a/src/lib/other/registerqappassociation.h
+++ b/src/lib/other/registerqappassociation.h
@@ -19,6 +19,7 @@
 #ifndef REGISTERQAPPASSOCIATION_H
 #define REGISTERQAPPASSOCIATION_H
 
+#include <QObject>
 #include <QHash>
 #include <QPair>
 
diff --git a/src/lib/other/sourceviewer.h b/src/lib/other/sourceviewer.h
index 39358ec26..4895bee29 100644
--- a/src/lib/other/sourceviewer.h
+++ b/src/lib/other/sourceviewer.h
@@ -19,7 +19,7 @@
 #define SOURCEVIEWER_H
 
 #include <QWidget>
-#include <QWeakPointer>
+#include <QPointer>
 
 #include "qz_namespace.h"
 
@@ -53,7 +53,7 @@ private slots:
 private:
     QBoxLayout* m_layout;
     PlainEditWithLines* m_sourceEdit;
-    QWeakPointer<QWebFrame> m_frame;
+    QPointer<QWebFrame> m_frame;
     QStatusBar* m_statusBar;
 
     QString m_selectedHtml;
diff --git a/src/lib/other/useragentmanager.h b/src/lib/other/useragentmanager.h
index c311af636..401c6c512 100644
--- a/src/lib/other/useragentmanager.h
+++ b/src/lib/other/useragentmanager.h
@@ -19,6 +19,7 @@
 #define USERAGENTMANAGER_H
 
 #include <QHash>
+#include <QString>
 
 #include "qz_namespace.h"
 
diff --git a/src/lib/plugins/plugins.h b/src/lib/plugins/plugins.h
index 9405fa073..ec5d681e6 100644
--- a/src/lib/plugins/plugins.h
+++ b/src/lib/plugins/plugins.h
@@ -20,7 +20,7 @@
 
 #include <QObject>
 #include <QVariant>
-#include <QWeakPointer>
+#include <QPointer>
 
 #include "qz_namespace.h"
 #include "plugininterface.h"
diff --git a/src/lib/plugins/speeddial.h b/src/lib/plugins/speeddial.h
index 9840aa16c..df6102ff1 100644
--- a/src/lib/plugins/speeddial.h
+++ b/src/lib/plugins/speeddial.h
@@ -19,7 +19,7 @@
 #define SPEEDDIAL_H
 
 #include <QObject>
-#include <QWeakPointer>
+#include <QPointer>
 
 #include "qz_namespace.h"
 
@@ -97,7 +97,7 @@ private:
     int m_sizeOfSpeedDials;
     int m_sdcentered;
 
-    QList<QWeakPointer<QWebFrame> > m_webFrames;
+    QList<QPointer<QWebFrame> > m_webFrames;
     QList<Page> m_webPages;
 
     bool m_loaded;
diff --git a/src/lib/preferences/pluginsmanager.cpp b/src/lib/preferences/pluginsmanager.cpp
index 3bfe21983..8c5809637 100644
--- a/src/lib/preferences/pluginsmanager.cpp
+++ b/src/lib/preferences/pluginsmanager.cpp
@@ -21,10 +21,10 @@
 #include "mainapplication.h"
 #include "plugininterface.h"
 #include "pluginlistdelegate.h"
+#include "globalfunctions.h"
 #include "settings.h"
 
 #include <QInputDialog>
-#include <QTextDocument>
 #include <QMessageBox>
 #include <QTimer>
 
@@ -177,7 +177,7 @@ void PluginsManager::refresh()
         }
         item->setIcon(icon);
 
-        QString pluginInfo = QString("<b>%1</b> %2<br/><i>%3</i><br/>%4").arg(spec.name, spec.version, Qt::escape(spec.author), spec.info);
+        QString pluginInfo = QString("<b>%1</b> %2<br/><i>%3</i><br/>%4").arg(spec.name, spec.version, qz_escape(spec.author), spec.info);
         item->setToolTip(pluginInfo);
 
         item->setText(spec.name);
diff --git a/src/lib/preferences/preferences.h b/src/lib/preferences/preferences.h
index 0655b1002..914d9d4cc 100644
--- a/src/lib/preferences/preferences.h
+++ b/src/lib/preferences/preferences.h
@@ -19,7 +19,7 @@
 #define PREFERENCES_H
 
 #include <QDialog>
-#include <QWeakPointer>
+#include <QPointer>
 
 #include "qz_namespace.h"
 
@@ -98,7 +98,7 @@ private:
     AutoFillManager* m_autoFillManager;
     PluginsManager* m_pluginsList;
     ThemeManager* m_themesManager;
-    QWeakPointer<DesktopNotification> m_notification;
+    QPointer<DesktopNotification> m_notification;
 
     QString m_homepage;
     QString m_newTabUrl;
diff --git a/src/lib/rss/rssmanager.h b/src/lib/rss/rssmanager.h
index 57f07b0d2..932af113c 100644
--- a/src/lib/rss/rssmanager.h
+++ b/src/lib/rss/rssmanager.h
@@ -25,7 +25,7 @@
 #include <QUrl>
 #include <QNetworkAccessManager>
 #include <QFormLayout>
-#include <QWeakPointer>
+#include <QPointer>
 #include <QDialogButtonBox>
 #include <QToolButton>
 #include <QInputDialog>
@@ -72,7 +72,7 @@ private:
 
     Ui::RSSManager* ui;
     QToolButton* m_reloadButton;
-    QWeakPointer<QupZilla> p_QupZilla;
+    QPointer<QupZilla> p_QupZilla;
 };
 
 #endif // RSSMANAGER_H
diff --git a/src/lib/rss/rssnotification.cpp b/src/lib/rss/rssnotification.cpp
index 089d33861..1403dcbc7 100644
--- a/src/lib/rss/rssnotification.cpp
+++ b/src/lib/rss/rssnotification.cpp
@@ -103,7 +103,7 @@ void RSSNotification::addRss()
     switch (ui->comboBox->itemData(index).toInt()) {
     case WebApplication: {
         const RssApp &app = m_rssApps.at(index);
-        const QUrl &url = QUrl::fromEncoded(QString(app.address + QUrl::toPercentEncoding(m_url.toString())).toAscii());
+        const QUrl &url = QUrl::fromEncoded(QString(app.address + QUrl::toPercentEncoding(m_url.toString())).toLatin1());
 
         m_view->openUrlInNewTab(url, Qz::NT_SelectedTab);
         success = true;
diff --git a/src/lib/sidebar/sidebar.cpp b/src/lib/sidebar/sidebar.cpp
index 16673778d..125201e51 100644
--- a/src/lib/sidebar/sidebar.cpp
+++ b/src/lib/sidebar/sidebar.cpp
@@ -26,7 +26,7 @@
 
 #include <QMenu>
 
-QHash<QString, QWeakPointer<SideBarInterface> > SideBarManager::s_sidebars;
+QHash<QString, QPointer<SideBarInterface> > SideBarManager::s_sidebars;
 
 SideBar::SideBar(SideBarManager* manager, QupZilla* mainClass)
     : QWidget(mainClass)
@@ -134,7 +134,7 @@ void SideBarManager::refreshMenu()
     act->setShortcut(QKeySequence("Ctrl+H"));
     act->setData("History");
 
-    foreach(const QWeakPointer<SideBarInterface> &sidebar, s_sidebars) {
+    foreach(const QPointer<SideBarInterface> &sidebar, s_sidebars) {
         if (!sidebar) {
             continue;
         }
diff --git a/src/lib/sidebar/sidebar.h b/src/lib/sidebar/sidebar.h
index 5eef86e25..76e51a7c3 100644
--- a/src/lib/sidebar/sidebar.h
+++ b/src/lib/sidebar/sidebar.h
@@ -20,7 +20,7 @@
 
 #include <QWidget>
 #include <QHash>
-#include <QWeakPointer>
+#include <QPointer>
 
 #include "qz_namespace.h"
 
@@ -67,7 +67,7 @@ public:
     void sideBarRemoved(const QString &id);
     void closeSideBar();
 
-    static QHash<QString, QWeakPointer<SideBarInterface> > s_sidebars;
+    static QHash<QString, QPointer<SideBarInterface> > s_sidebars;
     static void addSidebar(const QString &id, SideBarInterface* interface);
     static void removeSidebar(const QString &id);
 
@@ -78,7 +78,7 @@ private:
     void updateActions();
 
     QupZilla* p_QupZilla;
-    QWeakPointer<SideBar> m_sideBar;
+    QPointer<SideBar> m_sideBar;
     QMenu* m_menu;
 
     QString m_activeBar;
diff --git a/src/lib/tools/certificateinfowidget.cpp b/src/lib/tools/certificateinfowidget.cpp
index 93c0aa595..1b3577551 100644
--- a/src/lib/tools/certificateinfowidget.cpp
+++ b/src/lib/tools/certificateinfowidget.cpp
@@ -18,15 +18,20 @@
 #include "certificateinfowidget.h"
 #include "ui_certificateinfowidget.h"
 #include "mainapplication.h"
+#include "globalfunctions.h"
 
 #include <QSslCertificate>
-#include <QTextDocument>
 #include <QDateTime>
 
 QString CertificateInfoWidget::certificateItemText(const QSslCertificate &cert)
 {
+#if QT_VERSION >= 0x050000
+    QString commonName = cert.subjectInfo(QSslCertificate::CommonName).isEmpty() ? QString() : cert.subjectInfo(QSslCertificate::CommonName).at(0);
+    QString organization = cert.subjectInfo(QSslCertificate::Organization).isEmpty() ? QString() : cert.subjectInfo(QSslCertificate::Organization).at(0);
+#else
     QString commonName = cert.subjectInfo(QSslCertificate::CommonName);
     QString organization = cert.subjectInfo(QSslCertificate::Organization);
+#endif
 
     if (commonName.isEmpty()) {
         return clearCertSpecialSymbols(organization);
@@ -37,7 +42,7 @@ QString CertificateInfoWidget::certificateItemText(const QSslCertificate &cert)
 
 QString CertificateInfoWidget::clearCertSpecialSymbols(const QString &string)
 {
-    QString n = Qt::escape(string);
+    QString n = qz_escape(string);
 
     if (!n.contains(QLatin1String("\\"))) {
         return n;
@@ -285,6 +290,15 @@ QString CertificateInfoWidget::clearCertSpecialSymbols(const QString &string)
     return n;
 }
 
+QString CertificateInfoWidget::clearCertSpecialSymbols(const QStringList &stringList)
+{
+    if (stringList.isEmpty()) {
+        return QString();
+    }
+
+    return clearCertSpecialSymbols(stringList.at(0));
+}
+
 QString CertificateInfoWidget::showCertInfo(const QString &string)
 {
     if (string.isEmpty()) {
@@ -295,6 +309,15 @@ QString CertificateInfoWidget::showCertInfo(const QString &string)
     }
 }
 
+QString CertificateInfoWidget::showCertInfo(const QStringList &stringList)
+{
+    if (stringList.isEmpty()) {
+        return QString();
+    }
+
+    return showCertInfo(stringList.at(0));
+}
+
 CertificateInfoWidget::CertificateInfoWidget(const QSslCertificate &cert, QWidget* parent)
     : QWidget(parent)
     , ui(new Ui::CertificateInfoWidget)
diff --git a/src/lib/tools/certificateinfowidget.h b/src/lib/tools/certificateinfowidget.h
index 8b3f27678..657a39011 100644
--- a/src/lib/tools/certificateinfowidget.h
+++ b/src/lib/tools/certificateinfowidget.h
@@ -35,8 +35,16 @@ public:
     explicit CertificateInfoWidget(const QSslCertificate &cert, QWidget* parent = 0);
     ~CertificateInfoWidget();
 
+    // Qt5 compatibility
+    // QSslCertificate::subjectInfo returns:
+    //      QString     in Qt 4
+    //      QStringList in Qt 5
+    //
     static QString showCertInfo(const QString &string);
+    static QString showCertInfo(const QStringList &stringList);
     static QString clearCertSpecialSymbols(const QString &string);
+    static QString clearCertSpecialSymbols(const QStringList &stringList);
+
     static QString certificateItemText(const QSslCertificate &cert);
 
 private:
diff --git a/src/lib/tools/globalfunctions.cpp b/src/lib/tools/globalfunctions.cpp
index dbfb6192a..4867b269e 100644
--- a/src/lib/tools/globalfunctions.cpp
+++ b/src/lib/tools/globalfunctions.cpp
@@ -17,6 +17,8 @@
 * ============================================================ */
 #include "globalfunctions.h"
 
+#include <QTextDocument>
+#include <QDateTime>
 #include <QByteArray>
 #include <QPixmap>
 #include <QPainter>
@@ -25,10 +27,15 @@
 #include <QDir>
 #include <QWidget>
 #include <QApplication>
+#include <QSslCertificate>
 #include <QDesktopWidget>
 #include <QUrl>
 #include <QIcon>
 
+#if QT_VERSION >= 0x050000
+#include <QUrlQuery>
+#endif
+
 QByteArray qz_pixmapToByteArray(const QPixmap &pix)
 {
     QByteArray bytes;
@@ -166,11 +173,19 @@ QString qz_urlEncodeQueryString(const QUrl &url)
     QString returnString = url.toString(QUrl::RemoveQuery | QUrl::RemoveFragment);
 
     if (url.hasQuery()) {
+#if QT_VERSION >= 0x050000
+        returnString += QLatin1Char('?') + url.query(QUrl::FullyEncoded);
+#else
         returnString += QLatin1Char('?') + url.encodedQuery();
+#endif
     }
 
     if (url.hasFragment()) {
+#if QT_VERSION >= 0x050000
+        returnString += QLatin1Char('#') + url.fragment(QUrl::FullyEncoded);
+#else
         returnString += QLatin1Char('#') + url.encodedFragment();
+#endif
     }
 
     returnString.replace(QLatin1Char(' '), QLatin1String("%20"));
@@ -342,6 +357,28 @@ QString QT_QUPZILLA_EXPORT qz_applyDirectionToPage(QString &pageContents)
     return pageContents;
 }
 
+// Qt5 migration help functions
+bool QT_QUPZILLA_EXPORT qz_isCertificateValid(const QSslCertificate &cert)
+{
+#if QT_VERSION >= 0x050000
+    const QDateTime currentTime = QDateTime::currentDateTime();
+    return currentTime >= cert.effectiveDate() &&
+           currentTime <= cert.expiryDate() &&
+           !cert.isBlacklisted();
+#else
+    return cert.isValid();
+#endif
+}
+
+QString QT_QUPZILLA_EXPORT qz_escape(const QString &string)
+{
+#if QT_VERSION >= 0x050000
+    return string.toHtmlEscaped();
+#else
+    return qz_escape(string);
+#endif
+}
+
 QString qz_buildSystem()
 {
 #ifdef Q_OS_LINUX
diff --git a/src/lib/tools/globalfunctions.h b/src/lib/tools/globalfunctions.h
index b60e0526e..0a1e5fab6 100644
--- a/src/lib/tools/globalfunctions.h
+++ b/src/lib/tools/globalfunctions.h
@@ -23,6 +23,7 @@
 
 #include "qz_namespace.h"
 
+class QSslCertificate;
 class QFontMetrics;
 class QPixmap;
 class QIcon;
@@ -56,6 +57,10 @@ QString QT_QUPZILLA_EXPORT qz_applyDirectionToPage(QString &pageContents);
 
 QString QT_QUPZILLA_EXPORT qz_buildSystem();
 
+// Qt5 migration help functions
+bool QT_QUPZILLA_EXPORT qz_isCertificateValid(const QSslCertificate &cert);
+QString QT_QUPZILLA_EXPORT qz_escape(const QString &string);
+
 template <typename T>
 bool qz_listContainsIndex(const QList<T> &list, int index)
 {
diff --git a/src/lib/tools/headerview.cpp b/src/lib/tools/headerview.cpp
index 571b1f145..78c63cfc0 100644
--- a/src/lib/tools/headerview.cpp
+++ b/src/lib/tools/headerview.cpp
@@ -25,7 +25,11 @@ HeaderView::HeaderView(QAbstractItemView* parent)
     , m_parent(parent)
     , m_menu(0)
 {
+#if QT_VERSION >= 0x050000
+    setSectionsMovable(true);
+#else
     setMovable(true);
+#endif
     setStretchLastSection(true);
     setDefaultAlignment(Qt::AlignLeft);
     setMinimumSectionSize(60);
diff --git a/src/lib/tools/treewidget.cpp b/src/lib/tools/treewidget.cpp
index 3ac8a57be..a1984231a 100644
--- a/src/lib/tools/treewidget.cpp
+++ b/src/lib/tools/treewidget.cpp
@@ -18,6 +18,7 @@
 #include "treewidget.h"
 #include "bookmarksmodel.h"
 
+#include <QMimeData>
 #include <QMouseEvent>
 #include <QSqlDatabase>
 #include <QApplication>
@@ -455,7 +456,10 @@ void TreeWidget::setDragDropReceiver(bool enable, QObject* receiver)
     viewport()->setAcceptDrops(enable);
     setDropIndicatorShown(enable);
     if (enable) {
+// TODO: It won't probably work in Qt5
+#if QT_VERSION < 0x050000
         model()->setSupportedDragActions(Qt::CopyAction);
+#endif
         connect(this, SIGNAL(folderParentChanged(QString, bool, bool*)), receiver, SLOT(changeFolderParent(QString, bool, bool*)));
         connect(this, SIGNAL(bookmarkParentChanged(int, QString, QString, bool*)), receiver, SLOT(changeBookmarkParent(int, QString, QString, bool*)));
         connect(this, SIGNAL(linkWasDroped(QUrl, QString, QVariant, QString, bool*)), receiver, SLOT(bookmarkDropedLink(QUrl, QString, QVariant, QString, bool*)));
diff --git a/src/lib/webview/siteinfo.cpp b/src/lib/webview/siteinfo.cpp
index 5ccfb81c7..3ea712091 100644
--- a/src/lib/webview/siteinfo.cpp
+++ b/src/lib/webview/siteinfo.cpp
@@ -146,12 +146,11 @@ SiteInfo::SiteInfo(WebView* view, QWidget* parent)
     }
 
     //SECURITY
-    if (cert.isValid()) {
+    if (qz_isCertificateValid(cert)) {
         ui->securityLabel->setText(tr("<b>Connection is Encrypted.</b>"));
         ui->certLabel->setText(tr("<b>Your connection to this page is secured with this certificate: </b>"));
         m_certWidget = new CertificateInfoWidget(cert);
         ui->certFrame->addWidget(m_certWidget);
-
     }
     else {
         ui->securityLabel->setText(tr("<b>Connection Not Encrypted.</b>"));
diff --git a/src/lib/webview/siteinfowidget.cpp b/src/lib/webview/siteinfowidget.cpp
index ab6dfe5f0..cb8c2021a 100644
--- a/src/lib/webview/siteinfowidget.cpp
+++ b/src/lib/webview/siteinfowidget.cpp
@@ -15,6 +15,7 @@
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * ============================================================ */
+#include "globalfunctions.h"
 #include "siteinfowidget.h"
 #include "ui_siteinfowidget.h"
 #include "qupzilla.h"
@@ -39,7 +40,7 @@ SiteInfoWidget::SiteInfoWidget(QupZilla* mainClass, QWidget* parent)
     WebPage* webPage = view->page();
     QUrl url = view->url();
 
-    if (webPage->sslCertificate().isValid()) {
+    if (qz_isCertificateValid(webPage->sslCertificate())) {
         ui->secureLabel->setText(tr("Your connection to this site is <b>secured</b>."));
         ui->secureIcon->setPixmap(QPixmap(":/icons/locationbar/accept.png"));
     }
diff --git a/src/lib/webview/tabbar.cpp b/src/lib/webview/tabbar.cpp
index e4a1b264f..a4fbf3a13 100644
--- a/src/lib/webview/tabbar.cpp
+++ b/src/lib/webview/tabbar.cpp
@@ -28,6 +28,7 @@
 #include "pluginproxy.h"
 
 #include <QMenu>
+#include <QMimeData>
 #include <QMouseEvent>
 #include <QStyleOption>
 #include <QApplication>
@@ -213,7 +214,6 @@ QSize TabBar::tabSizeHint(int index) const
 
             if (maxWidthForTab < PINNED_TAB_WIDTH) {
                 // FIXME: It overflows now
-
                 m_normalTabWidth = PINNED_TAB_WIDTH;
                 if (index == currentIndex()) {
                     size.setWidth(m_activeTabWidth);
diff --git a/src/lib/webview/tabwidget.cpp b/src/lib/webview/tabwidget.cpp
index c9b8abf39..391195765 100644
--- a/src/lib/webview/tabwidget.cpp
+++ b/src/lib/webview/tabwidget.cpp
@@ -33,6 +33,7 @@
 
 #include <QMovie>
 #include <QMenu>
+#include <QMimeData>
 #include <QStackedWidget>
 #include <QMouseEvent>
 #include <QWebHistory>
diff --git a/src/lib/webview/webinspectordockwidget.cpp b/src/lib/webview/webinspectordockwidget.cpp
index 55a0204a3..76f4a5b56 100644
--- a/src/lib/webview/webinspectordockwidget.cpp
+++ b/src/lib/webview/webinspectordockwidget.cpp
@@ -55,7 +55,7 @@ void WebInspectorDockWidget::close()
 void WebInspectorDockWidget::show()
 {
     QWebPage* page = p_QupZilla->weView()->page();
-    QWeakPointer<WebInspector> inspector = m_inspectors[page];
+    QPointer<WebInspector> inspector = m_inspectors[page];
 
     if (!inspector) {
         inspector = new WebInspector(this);
diff --git a/src/lib/webview/webinspectordockwidget.h b/src/lib/webview/webinspectordockwidget.h
index 1c24d1090..e5159b39c 100644
--- a/src/lib/webview/webinspectordockwidget.h
+++ b/src/lib/webview/webinspectordockwidget.h
@@ -20,7 +20,7 @@
 
 #include <QWebInspector>
 #include <QDockWidget>
-#include <QWeakPointer>
+#include <QPointer>
 #include <QHash>
 
 #include "qz_namespace.h"
@@ -56,9 +56,9 @@ public slots:
 
 private:
     QupZilla* p_QupZilla;
-    QHash<QWebPage*, QWeakPointer<WebInspector> > m_inspectors;
+    QHash<QWebPage*, QPointer<WebInspector> > m_inspectors;
 
-    QWeakPointer<WebInspector> m_currentInspector;
+    QPointer<WebInspector> m_currentInspector;
 };
 
 #endif // WEBINSPECTORDOCKWIDGET_H
diff --git a/src/lib/webview/webpage.cpp b/src/lib/webview/webpage.cpp
index 8bb07dc36..3978430d8 100644
--- a/src/lib/webview/webpage.cpp
+++ b/src/lib/webview/webpage.cpp
@@ -196,11 +196,11 @@ void WebPage::progress(int prog)
 {
     m_loadProgress = prog;
 
-    bool secStatus = sslCertificate().isValid();
+    bool secStatus = qz_isCertificateValid(sslCertificate());
 
     if (secStatus != m_secureStatus) {
         m_secureStatus = secStatus;
-        emit privacyChanged(sslCertificate().isValid());
+        emit privacyChanged(qz_isCertificateValid(sslCertificate()));
     }
 }
 
@@ -451,7 +451,7 @@ void WebPage::setSSLCertificate(const QSslCertificate &cert)
 
 QSslCertificate WebPage::sslCertificate()
 {
-    if (url().scheme() == QLatin1String("https") && m_sslCert.isValid()) {
+    if (url().scheme() == QLatin1String("https") && qz_isCertificateValid(m_sslCert)) {
         return m_sslCert;
     }
 
diff --git a/src/lib/webview/webtab.h b/src/lib/webview/webtab.h
index 036beca2f..15e50f345 100644
--- a/src/lib/webview/webtab.h
+++ b/src/lib/webview/webtab.h
@@ -19,7 +19,7 @@
 #define WEBTAB_H
 
 #include <QWidget>
-#include <QWeakPointer>
+#include <QPointer>
 #include <QIcon>
 #include <QUrl>
 
@@ -102,7 +102,7 @@ private:
     QupZilla* p_QupZilla;
     TabbedWebView* m_view;
     QVBoxLayout* m_layout;
-    QWeakPointer<LocationBar> m_locationBar;
+    QPointer<LocationBar> m_locationBar;
 
     SavedTab m_savedTab;
 
diff --git a/src/lib/webview/webview.cpp b/src/lib/webview/webview.cpp
index 8c7168658..6a372b530 100644
--- a/src/lib/webview/webview.cpp
+++ b/src/lib/webview/webview.cpp
@@ -504,7 +504,7 @@ void WebView::searchSelectedText()
     SearchEngine engine = mApp->searchEnginesManager()->activeEngine();
     if (QAction* act = qobject_cast<QAction*>(sender())) {
         if (act->data().isValid()) {
-            engine = qVariantValue<SearchEngine>(act->data());
+            engine = act->data().value<SearchEngine>();
         }
     }
 
@@ -517,7 +517,7 @@ void WebView::searchSelectedTextInBackgroundTab()
     SearchEngine engine = mApp->searchEnginesManager()->activeEngine();
     if (QAction* act = qobject_cast<QAction*>(sender())) {
         if (act->data().isValid()) {
-            engine = qVariantValue<SearchEngine>(act->data());
+            engine = act->data().value<SearchEngine>();
         }
     }
 
diff --git a/src/main/main.cpp b/src/main/main.cpp
index d6723df3c..69f539d97 100644
--- a/src/main/main.cpp
+++ b/src/main/main.cpp
@@ -31,6 +31,12 @@
 #include <QDateTime>
 #include <QTextStream>
 
+#if QT_VERSION >= 0x050000
+#include <QWebPage>
+#else
+#include "qwebkitversion.h"
+#endif
+
 void qupzilla_signal_handler(int s)
 {
     switch (s) {
diff --git a/src/main/main.pro b/src/main/main.pro
index b11972458..29add2ed3 100644
--- a/src/main/main.pro
+++ b/src/main/main.pro
@@ -1,4 +1,8 @@
-QT += core gui webkit sql network script
+isEqual(QT_MAJOR_VERSION, 5) {
+    QT += webkitwidgets network widgets printsupport sql script
+} else {
+    QT += core gui webkit sql network script
+}
 
 TARGET = qupzilla
 mac: TARGET = QupZilla
diff --git a/src/plugins.pri b/src/plugins.pri
index 3c28e6c4f..790093e16 100644
--- a/src/plugins.pri
+++ b/src/plugins.pri
@@ -27,9 +27,14 @@ INCLUDEPATH += $$PWD/lib/3rdparty\
 
 TEMPLATE = lib
 CONFIG += plugin
-QT *= webkit network
 DESTDIR = $$PWD/../bin/plugins/
 
+isEqual(QT_MAJOR_VERSION, 5) {
+    QT *= webkitwidgets network
+} else {
+    QT *= webkit network
+}
+
 OBJECTS_DIR = build
 MOC_DIR = build
 RCC_DIR = build
diff --git a/src/plugins/AccessKeysNavigation/akn_handler.h b/src/plugins/AccessKeysNavigation/akn_handler.h
index c7a86fbc8..2520f25d7 100644
--- a/src/plugins/AccessKeysNavigation/akn_handler.h
+++ b/src/plugins/AccessKeysNavigation/akn_handler.h
@@ -22,7 +22,7 @@
 #include <QTime>
 #include <QHash>
 #include <QWebElement>
-#include <QWeakPointer>
+#include <QPointer>
 
 class QKeyEvent;
 class QWebElement;
@@ -57,7 +57,7 @@ private:
     void makeAccessKeyLabel(const QChar &accessKey, const QWebElement &element);
     void handleAccessKey(QKeyEvent* event);
 
-    QWeakPointer<WebView> m_view;
+    QPointer<WebView> m_view;
 
     QList<QLabel*> m_accessKeyLabels;
     QHash<QChar, QWebElement> m_accessKeyNodes;
diff --git a/src/plugins/AccessKeysNavigation/akn_plugin.h b/src/plugins/AccessKeysNavigation/akn_plugin.h
index 83ec943d6..c9660ccc7 100644
--- a/src/plugins/AccessKeysNavigation/akn_plugin.h
+++ b/src/plugins/AccessKeysNavigation/akn_plugin.h
@@ -18,7 +18,7 @@
 #ifndef AKN_PLUGIN_H
 #define AKN_PLUGIN_H
 
-#include <QWeakPointer>
+#include <QPointer>
 
 #include "plugininterface.h"
 
@@ -44,7 +44,7 @@ public:
     bool keyPress(const Qz::ObjectName &type, QObject* obj, QKeyEvent* event);
 
 private:
-    QWeakPointer<AKN_Settings> m_settings;
+    QPointer<AKN_Settings> m_settings;
     AKN_Handler* m_handler;
 };
 
diff --git a/src/plugins/GreaseMonkey/gm_manager.h b/src/plugins/GreaseMonkey/gm_manager.h
index f15c5c4be..81cb98cf1 100644
--- a/src/plugins/GreaseMonkey/gm_manager.h
+++ b/src/plugins/GreaseMonkey/gm_manager.h
@@ -20,7 +20,7 @@
 
 #include <QObject>
 #include <QStringList>
-#include <QWeakPointer>
+#include <QPointer>
 
 class QUrl;
 class QNetworkRequest;
@@ -68,7 +68,7 @@ private slots:
 private:
     QString m_settingsPath;
     QString m_bootstrap;
-    QWeakPointer<GM_Settings> m_settings;
+    QPointer<GM_Settings> m_settings;
 
     QStringList m_disabledScripts;
     QList<GM_Script*> m_endScripts;
diff --git a/src/plugins/MouseGestures/mousegestures.h b/src/plugins/MouseGestures/mousegestures.h
index c98a3116f..5168122b2 100644
--- a/src/plugins/MouseGestures/mousegestures.h
+++ b/src/plugins/MouseGestures/mousegestures.h
@@ -19,7 +19,7 @@
 #define MOUSEGESTURES_H
 
 #include <QObject>
-#include <QWeakPointer>
+#include <QPointer>
 
 class QMouseEvent;
 
@@ -56,8 +56,8 @@ private slots:
 
 private:
     QjtMouseGestureFilter* m_filter;
-    QWeakPointer<MouseGesturesSettingsDialog> m_settings;
-    QWeakPointer<WebView> m_view;
+    QPointer<MouseGesturesSettingsDialog> m_settings;
+    QPointer<WebView> m_view;
 };
 
 #endif // MOUSEGESTURES_H
diff --git a/src/plugins/PIM/PIM_handler.cpp b/src/plugins/PIM/PIM_handler.cpp
index 86b4a2cda..e0407cc2e 100644
--- a/src/plugins/PIM/PIM_handler.cpp
+++ b/src/plugins/PIM/PIM_handler.cpp
@@ -114,7 +114,7 @@ void PIM_Handler::populateWebViewMenu(QMenu* menu, WebView* view, const QWebHitT
 
     QMenu* pimMenu = new QMenu(tr("Insert Personal Information"));
     pimMenu->setIcon(QIcon(":/PIM/data/PIM.png"));
-    
+
     if (!m_allInfo[PI_FirstName].isEmpty() && !m_allInfo[PI_LastName].isEmpty()) {
         const QString fullname = m_allInfo[PI_FirstName] + " " + m_allInfo[PI_LastName];
         QAction* action = pimMenu->addAction(fullname, this, SLOT(pimInsert()));
diff --git a/src/plugins/PIM/PIM_handler.h b/src/plugins/PIM/PIM_handler.h
index 9a1ff4eea..7b485cf63 100644
--- a/src/plugins/PIM/PIM_handler.h
+++ b/src/plugins/PIM/PIM_handler.h
@@ -24,7 +24,7 @@
 #include <QMessageBox>
 #include <QWebHitTestResult>
 #include <QMenu>
-#include <QWeakPointer>
+#include <QPointer>
 #include <QHash>
 
 class WebView;
@@ -81,8 +81,8 @@ private:
     QHash<PI_Type, QStringList> m_infoMatches;
     QHash<PI_Type, QString> m_translations;
 
-    QWeakPointer<PIM_Settings> m_settings;
-    QWeakPointer<WebView> m_view;
+    QPointer<PIM_Settings> m_settings;
+    QPointer<WebView> m_view;
     QWebElement m_element;
 
     QString m_settingsFile;