diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -65,6 +65,7 @@
 find_package(KF5AkonadiNotes ${AKONADINOTES_LIB_VERSION} CONFIG REQUIRED)
 find_package(KF5XmlGui ${KF5_VERSION} CONFIG REQUIRED)
 find_package(KF5Declarative ${KF5_VERSION} CONFIG REQUIRED)
+find_package(KF5SyntaxHighlighting ${KF5_VERSION} CONFIG REQUIRED)
 
 set(MAILCOMMON_LIB_VERSION "5.6.43")
 set(GRAVATAR_LIB_VERSION "5.6.41")
diff --git a/plugins/webengineurlinterceptor/adblock/lib/CMakeLists.txt b/plugins/webengineurlinterceptor/adblock/lib/CMakeLists.txt
--- a/plugins/webengineurlinterceptor/adblock/lib/CMakeLists.txt
+++ b/plugins/webengineurlinterceptor/adblock/lib/CMakeLists.txt
@@ -12,7 +12,6 @@
     widgets/adblocklistwidget.cpp
     widgets/adblocksettingwidget.cpp
     widgets/adblockshowlistdialog.cpp
-    widgets/adblocksyntaxhighlighter.cpp
     widgets/adblockutil.cpp
     )
 
@@ -57,6 +56,7 @@
     KF5::TextWidgets
     KF5::PimTextEdit
     KF5::Libkdepim
+    KF5::SyntaxHighlighting
     )
 
 set_target_properties(adblocklibprivate
diff --git a/plugins/webengineurlinterceptor/adblock/lib/widgets/adblockshowlistdialog.h b/plugins/webengineurlinterceptor/adblock/lib/widgets/adblockshowlistdialog.h
--- a/plugins/webengineurlinterceptor/adblock/lib/widgets/adblockshowlistdialog.h
+++ b/plugins/webengineurlinterceptor/adblock/lib/widgets/adblockshowlistdialog.h
@@ -21,6 +21,7 @@
 #define ADBLOCKSHOWLISTDIALOG_H
 
 #include <QDialog>
+#include <KSyntaxHighlighting/Repository>
 
 class KJob;
 class QTemporaryFile;
@@ -59,6 +60,7 @@
     QTemporaryFile *mTemporaryFile;
     KPIM::ProgressIndicatorLabel *mProgress;
     QPushButton *mUser1Button;
+    KSyntaxHighlighting::Repository mSyntaxRepo;
 };
 }
 
diff --git a/plugins/webengineurlinterceptor/adblock/lib/widgets/adblockshowlistdialog.cpp b/plugins/webengineurlinterceptor/adblock/lib/widgets/adblockshowlistdialog.cpp
--- a/plugins/webengineurlinterceptor/adblock/lib/widgets/adblockshowlistdialog.cpp
+++ b/plugins/webengineurlinterceptor/adblock/lib/widgets/adblockshowlistdialog.cpp
@@ -19,19 +19,21 @@
 
 #include "adblockshowlistdialog.h"
 #include "adblockinterceptor_debug.h"
-#include "adblocksyntaxhighlighter.h"
 #include "kpimtextedit/plaintexteditorwidget.h"
 #include "kpimtextedit/plaintexteditor.h"
 #include "Libkdepim/ProgressIndicatorLabel"
 
 #include <KLocalizedString>
 #include <KIO/Job>
-#include <QTemporaryFile>
 #include <KSharedConfig>
-#include <QUrl>
+#include <KConfigGroup>
+#include <KSyntaxHighlighting/Definition>
+#include <KSyntaxHighlighting/SyntaxHighlighter>
+#include <KSyntaxHighlighting/Theme>
 
+#include <QTemporaryFile>
+#include <QUrl>
 #include <QDialogButtonBox>
-#include <KConfigGroup>
 #include <QPushButton>
 #include <QVBoxLayout>
 
@@ -57,7 +59,12 @@
     mainLayout->addLayout(lay);
 
     mTextEdit = new KPIMTextEdit::PlainTextEditorWidget;
-    (void)new AdBlock::AdBlockSyntaxHighlighter(mTextEdit->editor()->document());
+
+    auto highlighter = new KSyntaxHighlighting::SyntaxHighlighter(mTextEdit->editor()->document());
+    highlighter->setDefinition(mSyntaxRepo.definitionForName(QStringLiteral("Adblock Plus")));
+    highlighter->setTheme((palette().color(QPalette::Base).lightness() < 128)
+        ? mSyntaxRepo.defaultTheme(KSyntaxHighlighting::Repository::DarkTheme)
+        : mSyntaxRepo.defaultTheme(KSyntaxHighlighting::Repository::LightTheme));
     mTextEdit->setReadOnly(true);
     lay->addWidget(mTextEdit);
 
diff --git a/plugins/webengineurlinterceptor/adblock/lib/widgets/adblocksyntaxhighlighter.h b/plugins/webengineurlinterceptor/adblock/lib/widgets/adblocksyntaxhighlighter.h
deleted file mode 100644
--- a/plugins/webengineurlinterceptor/adblock/lib/widgets/adblocksyntaxhighlighter.h
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
-   Copyright (C) 2013-2016 Montel Laurent <montel@kde.org>
-
-   This program is free software; you can redistribute it and/or
-   modify it under the terms of the GNU General Public
-   License as published by the Free Software Foundation; either
-   version 2 of the License, or (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; see the file COPYING.  If not, write to
-   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.
-*/
-
-#ifndef ADBLOCKSYNTAXHIGHLIGHTER_H
-#define ADBLOCKSYNTAXHIGHLIGHTER_H
-
-#include <KPIMTextEdit/SyntaxHighlighterBase>
-
-namespace AdBlock {
-class AdBlockSyntaxHighlighter : public KPIMTextEdit::SyntaxHighlighterBase
-{
-    Q_OBJECT
-public:
-    explicit AdBlockSyntaxHighlighter(QTextDocument *doc);
-    ~AdBlockSyntaxHighlighter();
-
-private:
-    void init() override;
-};
-}
-
-#endif // ADBLOCKSYNTAXHIGHLIGHTER_H
diff --git a/plugins/webengineurlinterceptor/adblock/lib/widgets/adblocksyntaxhighlighter.cpp b/plugins/webengineurlinterceptor/adblock/lib/widgets/adblocksyntaxhighlighter.cpp
deleted file mode 100644
--- a/plugins/webengineurlinterceptor/adblock/lib/widgets/adblocksyntaxhighlighter.cpp
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
-   Copyright (C) 2013-2017 Montel Laurent <montel@kde.org>
-
-   This program is free software; you can redistribute it and/or
-   modify it under the terms of the GNU General Public
-   License as published by the Free Software Foundation; either
-   version 2 of the License, or (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; see the file COPYING.  If not, write to
-   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.
-*/
-
-#include "adblocksyntaxhighlighter.h"
-
-using namespace AdBlock;
-
-AdBlockSyntaxHighlighter::AdBlockSyntaxHighlighter(QTextDocument *doc)
-    : KPIMTextEdit::SyntaxHighlighterBase(doc)
-{
-    init();
-}
-
-AdBlockSyntaxHighlighter::~AdBlockSyntaxHighlighter()
-{
-}
-
-void AdBlockSyntaxHighlighter::init()
-{
-    QTextCharFormat commentFormat;
-    commentFormat.setForeground(Qt::darkYellow);
-    m_rules.reserve(4);
-    QRegularExpression commentRegex(QStringLiteral("^!.*"));
-    m_rules.append(KPIMTextEdit::Rule(commentRegex, commentFormat));
-
-    QTextCharFormat exceptionFormat;
-    exceptionFormat.setForeground(Qt::magenta);
-    QRegularExpression exceptionRegex(QStringLiteral("^@@.*"));
-    m_rules.append(KPIMTextEdit::Rule(exceptionRegex, exceptionFormat));
-
-    QTextCharFormat headerFormat;
-    headerFormat.setForeground(Qt::red);
-    QRegularExpression headerRegex(QStringLiteral("^\\[.*"));
-    m_rules.append(KPIMTextEdit::Rule(headerRegex, headerFormat));
-
-    QTextCharFormat elementFormat;
-    elementFormat.setForeground(Qt::blue);
-    QRegularExpression elementRegex(QStringLiteral(".*##.*"));
-    m_rules.append(KPIMTextEdit::Rule(elementRegex, elementFormat));
-}