diff --git a/qutebrowser/app.py b/qutebrowser/app.py
index 76542b7c4..dc3efd04e 100644
--- a/qutebrowser/app.py
+++ b/qutebrowser/app.py
@@ -45,7 +45,7 @@ import qutebrowser.resources
 from qutebrowser.completion.models import instances as completionmodels
 from qutebrowser.commands import cmdutils, runners, cmdexc
 from qutebrowser.config import style, config, websettings, configexc
-from qutebrowser.browser import urlmarks, adblock, history
+from qutebrowser.browser import urlmarks, adblock, history, browsertab
 from qutebrowser.browser.webkit import cookies, cache, downloads
 from qutebrowser.browser.webkit.network import (qutescheme, proxy,
                                                 networkmanager)
@@ -442,6 +442,8 @@ def _init_modules(args, crash_handler):
         os.environ.pop('QT_WAYLAND_DISABLE_WINDOWDECORATION', None)
     temp_downloads = downloads.TempDownloadManager(qApp)
     objreg.register('temporary-downloads', temp_downloads)
+    # Init backend-specific stuff
+    browsertab.init(args)
 
 
 def _init_late_modules(args):
diff --git a/qutebrowser/browser/browsertab.py b/qutebrowser/browser/browsertab.py
index d15f53df5..811c84fba 100644
--- a/qutebrowser/browser/browsertab.py
+++ b/qutebrowser/browser/browsertab.py
@@ -55,6 +55,16 @@ def create(win_id, parent=None):
     return tab_class(win_id=win_id, mode_manager=mode_manager, parent=parent)
 
 
+def init(args):
+    """Initialize backend-specific modules."""
+    if objreg.get('args').backend == 'webengine':
+        from qutebrowser.browser.webengine import webenginetab
+        webenginetab.init()
+    else:
+        from qutebrowser.browser.webkit import webkittab
+        webkittab.init()
+
+
 class WebTabError(Exception):
 
     """Base class for various errors."""
diff --git a/qutebrowser/browser/webengine/interceptor.py b/qutebrowser/browser/webengine/interceptor.py
new file mode 100644
index 000000000..5a1c58fc9
--- /dev/null
+++ b/qutebrowser/browser/webengine/interceptor.py
@@ -0,0 +1,61 @@
+# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
+
+# Copyright 2016 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
+#
+# This file is part of qutebrowser.
+#
+# qutebrowser 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 3 of the License, or
+# (at your option) any later version.
+#
+# qutebrowser 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 qutebrowser.  If not, see <http://www.gnu.org/licenses/>.
+
+"""A request interceptor taking care of adblocking and custom headers."""
+
+from PyQt5.QtWidgets import QApplication
+from PyQt5.QtWebEngineCore import QWebEngineUrlRequestInterceptor
+
+from qutebrowser.utils import utils, log
+
+
+class RequestInterceptor(QWebEngineUrlRequestInterceptor):
+
+    """Handle ad blocking and custom headers."""
+
+    def __init__(self, host_blocker, parent=None):
+        super().__init__(parent)
+        self._host_blocker = host_blocker
+
+    def install(self, profile):
+        """Install the interceptor on the given QWebEngineProfile."""
+        profile.setRequestInterceptor(self)
+
+    # Gets called in the IO thread -> showing crash window will fail
+    @utils.prevent_exceptions(None)
+    def interceptRequest(self, info):
+        """Handle the given request.
+
+        Reimplementing this virtual function and setting the interceptor on a
+        profile makes it possible to intercept URL requests. This function is
+        executed on the IO thread, and therefore running long tasks here will
+        block networking.
+
+        info contains the information about the URL request and will track
+        internally whether its members have been altered.
+
+        Args:
+            info: QWebEngineUrlRequestInfo &info
+        """
+        # FIXME:qtwebengine only block ads for NavigationTypeOther?
+        if (bytes(info.requestMethod()) == b'GET' and
+                self._host_blocker.is_blocked(info.requestUrl())):
+            log.webview.info("Request to {} blocked by host blocker.".format(
+                info.requestUrl().host()))
+            info.block(True)
diff --git a/qutebrowser/browser/webengine/webenginetab.py b/qutebrowser/browser/webengine/webenginetab.py
index 79fcc1dfc..81da3fb28 100644
--- a/qutebrowser/browser/webengine/webenginetab.py
+++ b/qutebrowser/browser/webengine/webenginetab.py
@@ -27,13 +27,25 @@ import functools
 from PyQt5.QtCore import pyqtSlot, Qt, QEvent, QPoint, QUrl, QTimer
 from PyQt5.QtGui import QKeyEvent, QIcon
 # pylint: disable=no-name-in-module,import-error,useless-suppression
-from PyQt5.QtWidgets import QOpenGLWidget
-from PyQt5.QtWebEngineWidgets import QWebEnginePage, QWebEngineScript
+from PyQt5.QtWidgets import QOpenGLWidget, QApplication
+from PyQt5.QtWebEngineWidgets import (QWebEnginePage, QWebEngineScript,
+                                      QWebEngineProfile)
 # pylint: enable=no-name-in-module,import-error,useless-suppression
 
 from qutebrowser.browser import browsertab, mouse
-from qutebrowser.browser.webengine import webview, webengineelem, tabhistory
-from qutebrowser.utils import usertypes, qtutils, log, javascript, utils
+from qutebrowser.browser.webengine import (webview, webengineelem, tabhistory,
+                                           interceptor)
+from qutebrowser.utils import (usertypes, qtutils, log, javascript, utils,
+                               objreg)
+
+
+def init():
+    """Initialize QtWebEngine-specific modules."""
+    log.init.debug("Initializing request interceptor...")
+    host_blocker = objreg.get('host-blocker')
+    req_interceptor = interceptor.RequestInterceptor(
+        host_blocker, parent=QApplication.instance())
+    req_interceptor.install(QWebEngineProfile.defaultProfile())
 
 
 class WebEnginePrinting(browsertab.AbstractPrinting):
diff --git a/qutebrowser/browser/webkit/webkittab.py b/qutebrowser/browser/webkit/webkittab.py
index a185bfe7e..fe984b60e 100644
--- a/qutebrowser/browser/webkit/webkittab.py
+++ b/qutebrowser/browser/webkit/webkittab.py
@@ -35,6 +35,12 @@ from qutebrowser.browser.webkit import webview, tabhistory, webkitelem
 from qutebrowser.utils import qtutils, objreg, usertypes, utils, log
 
 
+def init():
+    """Initialize QtWebKit-specific modules."""
+    # FIXME:qtwebengine Move things we don't need with QtWebEngine here.
+    pass
+
+
 class WebKitPrinting(browsertab.AbstractPrinting):
 
     """QtWebKit implementations related to printing."""