diff --git a/src/lib/plugins/pluginproxy.h b/src/lib/plugins/pluginproxy.h
index 3d0aae45a..9d81cc7d3 100644
--- a/src/lib/plugins/pluginproxy.h
+++ b/src/lib/plugins/pluginproxy.h
@@ -21,8 +21,10 @@
 #include "plugins.h"
 #include "qzcommon.h"
 
-class BrowserWindow;
+#include <QWebEnginePage>
+
 class WebPage;
+class BrowserWindow;
 
 class QUPZILLA_EXPORT PluginProxy : public Plugins
 {
diff --git a/src/plugins.pri b/src/plugins.pri
index 7dd7c8c8b..d235ba230 100644
--- a/src/plugins.pri
+++ b/src/plugins.pri
@@ -35,6 +35,8 @@ DESTDIR = $$QZ_DESTDIR/plugins/
 
 QT *= webenginewidgets network
 
+CONFIG += c++11
+
 OBJECTS_DIR = build
 MOC_DIR = build
 RCC_DIR = build
diff --git a/src/plugins/GreaseMonkey/gm_addscriptdialog.h b/src/plugins/GreaseMonkey/gm_addscriptdialog.h
index 97192254a..8f2a1b0db 100644
--- a/src/plugins/GreaseMonkey/gm_addscriptdialog.h
+++ b/src/plugins/GreaseMonkey/gm_addscriptdialog.h
@@ -33,7 +33,7 @@ class GM_AddScriptDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit GM_AddScriptDialog(GM_Manager* manager, GM_Script* script, QWidget* parent);
+    explicit GM_AddScriptDialog(GM_Manager *manager, GM_Script *script, QWidget *parent = Q_NULLPTR);
     ~GM_AddScriptDialog();
 
 private slots:
diff --git a/src/plugins/GreaseMonkey/gm_downloader.cpp b/src/plugins/GreaseMonkey/gm_downloader.cpp
index 616e31968..b202c8eaf 100644
--- a/src/plugins/GreaseMonkey/gm_downloader.cpp
+++ b/src/plugins/GreaseMonkey/gm_downloader.cpp
@@ -30,20 +30,12 @@
 #include <QSettings>
 #include "qzregexp.h"
 
-GM_Downloader::GM_Downloader(const QNetworkRequest &request, GM_Manager* manager)
+GM_Downloader::GM_Downloader(const QUrl &url, GM_Manager* manager)
     : QObject()
     , m_manager(manager)
-    , m_widget(0)
 {
-    m_reply = new FollowRedirectReply(request.url(), mApp->networkManager());
+    m_reply = new FollowRedirectReply(url, mApp->networkManager());
     connect(m_reply, SIGNAL(finished()), this, SLOT(scriptDownloaded()));
-
-    QVariant v = request.attribute((QNetworkRequest::Attribute)(QNetworkRequest::User + 100));
-    WebPage* webPage = static_cast<WebPage*>(v.value<void*>());
-
-    if (WebPage::isPointerSafeToUse(webPage)) {
-        m_widget = webPage->view();
-    }
 }
 
 void GM_Downloader::scriptDownloaded()
@@ -148,7 +140,7 @@ void GM_Downloader::downloadRequires()
 
         if (script->isValid()) {
             if (!m_manager->containsScript(script->fullName())) {
-                GM_AddScriptDialog dialog(m_manager, script, m_widget);
+                GM_AddScriptDialog dialog(m_manager, script);
                 deleteScript = dialog.exec() != QDialog::Accepted;
             }
             else {
diff --git a/src/plugins/GreaseMonkey/gm_downloader.h b/src/plugins/GreaseMonkey/gm_downloader.h
index a4bbf40de..19eba794d 100644
--- a/src/plugins/GreaseMonkey/gm_downloader.h
+++ b/src/plugins/GreaseMonkey/gm_downloader.h
@@ -32,7 +32,7 @@ class GM_Downloader : public QObject
 {
     Q_OBJECT
 public:
-    explicit GM_Downloader(const QNetworkRequest &request, GM_Manager* manager);
+    explicit GM_Downloader(const QUrl &url, GM_Manager* manager);
 
 private slots:
     void scriptDownloaded();
@@ -43,7 +43,6 @@ private:
 
     GM_Manager* m_manager;
     FollowRedirectReply* m_reply;
-    QWidget* m_widget;
 
     QString m_fileName;
     QList<QUrl> m_requireUrls;
diff --git a/src/plugins/GreaseMonkey/gm_manager.cpp b/src/plugins/GreaseMonkey/gm_manager.cpp
index 2ef377668..27662c8bd 100644
--- a/src/plugins/GreaseMonkey/gm_manager.cpp
+++ b/src/plugins/GreaseMonkey/gm_manager.cpp
@@ -30,9 +30,10 @@
 
 #include <QTimer>
 #include <QDir>
-#include <QWebFrame>
 #include <QSettings>
 #include <QStatusBar>
+#include <QWebEngineProfile>
+#include <QWebEngineScriptCollection>
 
 GM_Manager::GM_Manager(const QString &sPath, QObject* parent)
     : QObject(parent)
@@ -52,9 +53,9 @@ void GM_Manager::showSettings(QWidget* parent)
     m_settings.data()->raise();
 }
 
-void GM_Manager::downloadScript(const QNetworkRequest &request)
+void GM_Manager::downloadScript(const QUrl &url)
 {
-    new GM_Downloader(request, this);
+    new GM_Downloader(url, this);
 }
 
 QString GM_Manager::settinsPath() const
@@ -109,41 +110,34 @@ void GM_Manager::unloadPlugin()
 
 QList<GM_Script*> GM_Manager::allScripts() const
 {
-    QList<GM_Script*> list;
-    list.append(m_startScripts);
-    list.append(m_endScripts);
-
-    return list;
+    return m_scripts;
 }
 
 bool GM_Manager::containsScript(const QString &fullName) const
 {
-    foreach (GM_Script* script, m_startScripts) {
-        if (fullName == script->fullName()) {
-            return true;
-        }
-    }
-
-    foreach (GM_Script* script, m_endScripts) {
+    foreach (GM_Script* script, m_scripts) {
         if (fullName == script->fullName()) {
             return true;
         }
     }
 
     return false;
-
 }
 
 void GM_Manager::enableScript(GM_Script* script)
 {
     script->setEnabled(true);
     m_disabledScripts.removeOne(script->fullName());
+
+    mApp->webProfile()->scripts().insert(script->webScript());
 }
 
 void GM_Manager::disableScript(GM_Script* script)
 {
     script->setEnabled(false);
     m_disabledScripts.append(script->fullName());
+
+    mApp->webProfile()->scripts().remove(script->webScript());
 }
 
 bool GM_Manager::addScript(GM_Script* script)
@@ -152,12 +146,8 @@ bool GM_Manager::addScript(GM_Script* script)
         return false;
     }
 
-    if (script->startAt() == GM_Script::DocumentStart) {
-        m_startScripts.append(script);
-    }
-    else {
-        m_endScripts.append(script);
-    }
+    m_scripts.append(script);
+    mApp->webProfile()->scripts().insert(script->webScript());
 
     emit scriptsChanged();
     return true;
@@ -169,12 +159,8 @@ bool GM_Manager::removeScript(GM_Script* script, bool removeFile)
         return false;
     }
 
-    if (script->startAt() == GM_Script::DocumentStart) {
-        m_startScripts.removeOne(script);
-    }
-    else {
-        m_endScripts.removeOne(script);
-    }
+    m_scripts.removeOne(script);
+    mApp->webProfile()->scripts().insert(script->webScript());
 
     m_disabledScripts.removeOne(script->fullName());
 
@@ -194,51 +180,6 @@ void GM_Manager::showNotification(const QString &message, const QString &title)
     mApp->desktopNotifications()->showNotification(icon, title.isEmpty() ? tr("GreaseMonkey") : title, message);
 }
 
-void GM_Manager::frameLoadStart()
-{
-    QWebFrame* frame = qobject_cast<QWebFrame*>(sender());
-    if (!frame) {
-        return;
-    }
-
-    const QUrl url = QzTools::frameUrl(frame);
-    const QString urlScheme = url.scheme();
-    const QString urlString = url.toEncoded();
-
-    if (!canRunOnScheme(urlScheme)) {
-        return;
-    }
-
-    const QString readyState = frame->evaluateJavaScript(QSL("document.readyState")).toString();
-
-    frame->addToJavaScriptWindowObject(QSL("_qz_greasemonkey"), m_jsObject);
-
-    foreach (GM_Script* script, m_startScripts) {
-        if (script->match(urlString)) {
-            frame->evaluateJavaScript(m_bootstrap + script->script());
-        }
-    }
-
-    foreach (GM_Script* script, m_endScripts) {
-        if (script->match(urlString)) {
-            // If DOMContentLoaded already fired
-            if (readyState == QL1S("complete")) {
-                frame->evaluateJavaScript(m_bootstrap + script->script());
-            }
-            else {
-                const QString jscript = QString(QSL("window.addEventListener(\"DOMContentLoaded\",function(e) { \n%1\n }, true);"))
-                        .arg(m_bootstrap + script->script());
-                frame->evaluateJavaScript(jscript);
-            }
-        }
-    }
-}
-
-void GM_Manager::frameCreated(QWebFrame *frame)
-{
-    connect(frame, SIGNAL(javaScriptWindowObjectCleared()), this, SLOT(frameLoadStart()));
-}
-
 void GM_Manager::load()
 {
     QDir gmDir(m_settingsPath + QL1S("/greasemonkey"));
@@ -263,15 +204,13 @@ void GM_Manager::load()
             continue;
         }
 
+        m_scripts.append(script);
+
         if (m_disabledScripts.contains(script->fullName())) {
             script->setEnabled(false);
         }
-
-        if (script->startAt() == GM_Script::DocumentStart) {
-            m_startScripts.append(script);
-        }
         else {
-            m_endScripts.append(script);
+            mApp->webProfile()->scripts().insert(script->webScript());
         }
     }
 
diff --git a/src/plugins/GreaseMonkey/gm_manager.h b/src/plugins/GreaseMonkey/gm_manager.h
index 9e87774e2..3f47b657b 100644
--- a/src/plugins/GreaseMonkey/gm_manager.h
+++ b/src/plugins/GreaseMonkey/gm_manager.h
@@ -40,7 +40,7 @@ public:
     explicit GM_Manager(const QString &sPath, QObject* parent = 0);
 
     void showSettings(QWidget* parent);
-    void downloadScript(const QNetworkRequest &request);
+    void downloadScript(const QUrl &url);
 
     QString settinsPath() const;
     QString scriptsDirectory() const;
@@ -68,9 +68,6 @@ public slots:
     void mainWindowCreated(BrowserWindow* window);
     void mainWindowDeleted(BrowserWindow* window);
 
-    void frameLoadStart();
-    void frameCreated(QWebFrame* frame);
-
 private slots:
     void load();
 
@@ -81,8 +78,7 @@ private:
 
     QStringList m_disabledScripts;
     GM_JSObject* m_jsObject;
-    QList<GM_Script*> m_endScripts;
-    QList<GM_Script*> m_startScripts;
+    QList<GM_Script*> m_scripts;
 
     QHash<BrowserWindow*, GM_Icon*> m_windows;
 };
diff --git a/src/plugins/GreaseMonkey/gm_plugin.cpp b/src/plugins/GreaseMonkey/gm_plugin.cpp
index 8d1fb2a8c..01914be9e 100644
--- a/src/plugins/GreaseMonkey/gm_plugin.cpp
+++ b/src/plugins/GreaseMonkey/gm_plugin.cpp
@@ -53,21 +53,13 @@ void GM_Plugin::init(InitState state, const QString &settingsPath)
 {
     m_manager = new GM_Manager(settingsPath, this);
 
-    connect(mApp->plugins(), SIGNAL(webPageCreated(WebPage*)), this, SLOT(webPageCreated(WebPage*)));
     connect(mApp->plugins(), SIGNAL(mainWindowCreated(BrowserWindow*)), m_manager, SLOT(mainWindowCreated(BrowserWindow*)));
     connect(mApp->plugins(), SIGNAL(mainWindowDeleted(BrowserWindow*)), m_manager, SLOT(mainWindowDeleted(BrowserWindow*)));
 
     // Make sure userscripts works also with already created WebPages
     if (state == LateInitState) {
-        foreach (BrowserWindow* window, mApp->windows()) {
+        for (BrowserWindow *window : mApp->windows()) {
             m_manager->mainWindowCreated(window);
-
-            for (int i = 0; i < window->tabWidget()->count(); ++i) {
-                WebTab* tab = qobject_cast<WebTab*>(window->tabWidget()->widget(i));
-                if (tab) {
-                    webPageCreated(tab->webView()->page());
-                }
-            }
         }
     }
 }
@@ -96,26 +88,18 @@ void GM_Plugin::showSettings(QWidget* parent)
     m_manager->showSettings(parent);
 }
 
-QNetworkReply* GM_Plugin::createRequest(QNetworkAccessManager::Operation op, const QNetworkRequest &request, QIODevice* outgoingData)
+bool GM_Plugin::acceptNavigationRequest(WebPage *page, const QUrl &url, QWebEnginePage::NavigationType type, bool isMainFrame)
 {
-    Q_UNUSED(outgoingData)
+    Q_UNUSED(page)
+    Q_UNUSED(type)
+    Q_UNUSED(isMainFrame)
 
-    if (op == QNetworkAccessManager::GetOperation && request.rawHeader("X-QupZilla-UserLoadAction") == QByteArray("1")) {
-        const QString urlString = request.url().toString(QUrl::RemoveFragment | QUrl::RemoveQuery);
-
-        if (urlString.endsWith(QLatin1String(".user.js"))) {
-            m_manager->downloadScript(request);
-            return new EmptyNetworkReply;
-        }
+    if (url.toString().endsWith(QL1S(".user.js"))) {
+        m_manager->downloadScript(url);
+        return false;
     }
 
-    return 0;
-}
-
-void GM_Plugin::webPageCreated(WebPage* page)
-{
-    m_manager->frameCreated(page->mainFrame());
-    connect(page, SIGNAL(frameCreated(QWebFrame*)), m_manager, SLOT(frameCreated(QWebFrame*)));
+    return true;
 }
 
 #if QT_VERSION < 0x050000
diff --git a/src/plugins/GreaseMonkey/gm_plugin.h b/src/plugins/GreaseMonkey/gm_plugin.h
index e7d80a57b..ba89d8ece 100644
--- a/src/plugins/GreaseMonkey/gm_plugin.h
+++ b/src/plugins/GreaseMonkey/gm_plugin.h
@@ -43,10 +43,7 @@ public:
     QTranslator* getTranslator(const QString &locale);
     void showSettings(QWidget* parent = 0);
 
-    QNetworkReply* createRequest(QNetworkAccessManager::Operation op, const QNetworkRequest &request, QIODevice* outgoingData);
-
-private slots:
-    void webPageCreated(WebPage* page);
+    bool acceptNavigationRequest(WebPage *page, const QUrl &url, QWebEnginePage::NavigationType type, bool isMainFrame);
 
 private:
     GM_Manager* m_manager;
diff --git a/src/plugins/GreaseMonkey/gm_script.cpp b/src/plugins/GreaseMonkey/gm_script.cpp
index 94d05f348..10571599d 100644
--- a/src/plugins/GreaseMonkey/gm_script.cpp
+++ b/src/plugins/GreaseMonkey/gm_script.cpp
@@ -23,7 +23,6 @@
 
 #include <QFile>
 #include <QStringList>
-#include <QWebFrame>
 #include <QCryptographicHash>
 
 GM_Script::GM_Script(GM_Manager* manager, const QString &filePath)
@@ -32,6 +31,7 @@ GM_Script::GM_Script(GM_Manager* manager, const QString &filePath)
     , m_fileWatcher(new DelayedFileWatcher(this))
     , m_namespace("GreaseMonkeyNS")
     , m_startAt(DocumentEnd)
+    , m_noframes(false)
     , m_fileName(filePath)
     , m_enabled(true)
     , m_valid(false)
@@ -81,6 +81,11 @@ GM_Script::StartAt GM_Script::startAt() const
     return m_startAt;
 }
 
+bool GM_Script::noFrames() const
+{
+    return m_noframes;
+}
+
 bool GM_Script::isEnabled() const
 {
     return m_valid && m_enabled;
@@ -118,11 +123,21 @@ QString GM_Script::script() const
     return m_script;
 }
 
+QString GM_Script::metaData() const
+{
+    return m_metadata;
+}
+
 QString GM_Script::fileName() const
 {
     return m_fileName;
 }
 
+QWebEngineScript GM_Script::webScript() const
+{
+    return m_webScript;
+}
+
 bool GM_Script::match(const QString &urlString)
 {
     if (!isEnabled()) {
@@ -258,8 +273,14 @@ void GM_Script::parseScript()
     }
 
     int index = fileData.indexOf(QLatin1String("// ==/UserScript==")) + 18;
-    QString script = fileData.mid(index).trimmed();
+    m_metadata = fileData.mid(0, index);
 
+    QString script = fileData.mid(index).trimmed();
+    m_valid = !script.isEmpty();
+
+    m_script = QSL("(function(){%1\n%2\n})();").arg(m_manager->requireScripts(requireList), script);
+
+#if QTWEBENGINE_DISABLED
     QString jscript("(function(){"
                     "function GM_getValue(name,val){return GM_getValueImpl('%1',name,val);}"
                     "function GM_setValue(name,val){return GM_setValueImpl('%1',name,val);}"
@@ -267,10 +288,12 @@ void GM_Script::parseScript()
                     "function GM_listValues(){return GM_listValuesImpl('%1');}"
                     "\n%2\n})();");
     QString nspace = QCryptographicHash::hash(fullName().toUtf8(), QCryptographicHash::Md4).toHex();
+#endif
 
-    script.prepend(m_manager->requireScripts(requireList));
-    script = jscript.arg(nspace, script);
-
-    m_script = script;
-    m_valid = !script.isEmpty();
+    // Create QWebEngineScript
+    m_webScript.setName(fullName());
+    m_webScript.setInjectionPoint(startAt() == DocumentStart ? QWebEngineScript::DocumentCreation : QWebEngineScript::DocumentReady);
+    m_webScript.setWorldId(QWebEngineScript::MainWorld);
+    m_webScript.setRunsOnSubFrames(!m_noframes);
+    m_webScript.setSourceCode(QSL("%1\n%2").arg(m_metadata, m_script));
 }
diff --git a/src/plugins/GreaseMonkey/gm_script.h b/src/plugins/GreaseMonkey/gm_script.h
index f0ec7868b..953d31fe0 100644
--- a/src/plugins/GreaseMonkey/gm_script.h
+++ b/src/plugins/GreaseMonkey/gm_script.h
@@ -23,6 +23,7 @@
 #include <QObject>
 #include <QVector>
 #include <QUrl>
+#include <QWebEngineScript>
 
 class QWebFrame;
 
@@ -49,6 +50,7 @@ public:
 
     QUrl downloadUrl() const;
     StartAt startAt() const;
+    bool noFrames() const;
 
     bool isEnabled() const;
     void setEnabled(bool enable);
@@ -57,8 +59,11 @@ public:
     QStringList exclude() const;
 
     QString script() const;
+    QString metaData() const;
     QString fileName() const;
 
+    QWebEngineScript webScript() const;
+
     bool match(const QString &urlString);
 
 signals:
@@ -83,11 +88,15 @@ private:
 
     QUrl m_downloadUrl;
     StartAt m_startAt;
+    bool m_noframes;
 
     QString m_script;
+    QString m_metadata;
     QString m_fileName;
     bool m_enabled;
     bool m_valid;
+
+    QWebEngineScript m_webScript;
 };
 
 #endif // GM_SCRIPT_H
diff --git a/src/plugins/plugins.pro b/src/plugins/plugins.pro
index 459f1e588..02d1a3d9f 100644
--- a/src/plugins/plugins.pro
+++ b/src/plugins/plugins.pro
@@ -44,7 +44,6 @@ isEqual(QT_MAJOR_VERSION, 5): !qtHaveModule(KWallet): disablePlugin(KWalletPassw
 disablePlugin(AccessKeysNavigation)
 disablePlugin(AutoScroll)
 disablePlugin(CopyTitle)
-disablePlugin(GreaseMonkey)
 disablePlugin(MailHandle)
 disablePlugin(MouseGestures)
 disablePlugin(PIM)