diff --git a/.flake8 b/.flake8
index 8c03ef729..7a783a4b0 100644
--- a/.flake8
+++ b/.flake8
@@ -46,6 +46,7 @@ ignore =
 min-version = 3.4.0
 max-complexity = 12
 per-file-ignores =
+    /qutebrowser/api/hook.py : N801
     /tests/**/*.py : D100,D101,D401
     /tests/unit/browser/test_history.py : N806
     /tests/helpers/fixtures.py : N806
diff --git a/qutebrowser/api/downloads.py b/qutebrowser/api/downloads.py
index f743f5d7a..82c68d0bd 100644
--- a/qutebrowser/api/downloads.py
+++ b/qutebrowser/api/downloads.py
@@ -18,6 +18,9 @@
 # along with qutebrowser.  If not, see <http://www.gnu.org/licenses/>.
 
 
+"""APIs related to downloading files."""
+
+
 import io
 
 from PyQt5.QtCore import QObject, pyqtSignal, pyqtSlot, QUrl
@@ -33,6 +36,7 @@ class TempDownload(QObject):
     finished = pyqtSignal()
 
     def __init__(self, item: qtnetworkdownloads.DownloadItem) -> None:
+        super().__init__()
         self._item = item
         self._item.finished.connect(self._on_download_finished)
         self.successful = False
diff --git a/qutebrowser/api/hook.py b/qutebrowser/api/hook.py
index bd8e2a635..3f06121da 100644
--- a/qutebrowser/api/hook.py
+++ b/qutebrowser/api/hook.py
@@ -17,6 +17,8 @@
 # You should have received a copy of the GNU General Public License
 # along with qutebrowser.  If not, see <http://www.gnu.org/licenses/>.
 
+# pylint: disable=invalid-name
+
 """Hooks for extensions."""
 
 import importlib
@@ -32,7 +34,7 @@ def _add_module_info(func: typing.Callable) -> loader.ModuleInfo:
     return loader.add_module_info(module)
 
 
-class init:  # noqa: N801,N806 pylint: disable=invalid-name
+class init:
 
     """Decorator to mark a function to run when initializing."""
 
diff --git a/qutebrowser/api/requests.py b/qutebrowser/api/requests.py
index 990faec88..5c23418b4 100644
--- a/qutebrowser/api/requests.py
+++ b/qutebrowser/api/requests.py
@@ -19,11 +19,6 @@
 
 """APIs related to intercepting/blocking requests."""
 
-import typing
-
-import attr
-from PyQt5.QtCore import QUrl
-
 from qutebrowser.extensions import requests
 # pylint: disable=unused-import
 from qutebrowser.extensions.requests import Request
diff --git a/qutebrowser/components/adblock.py b/qutebrowser/components/adblock.py
index aad802bd2..706620948 100644
--- a/qutebrowser/components/adblock.py
+++ b/qutebrowser/components/adblock.py
@@ -76,7 +76,8 @@ class _FakeDownload(downloads.TempDownload):
 
     """A download stub to use on_download_finished with local files."""
 
-    def __init__(self, fileobj: typing.IO[bytes]) -> None:
+    def __init__(self,  # pylint: disable=super-init-not-called
+                 fileobj: typing.IO[bytes]) -> None:
         self.fileobj = fileobj
         self.successful = True
 
@@ -337,6 +338,7 @@ def on_config_changed() -> None:
 
 @hook.init()
 def init(context: apitypes.InitContext) -> None:
+    """Initialize the host blocker."""
     global _host_blocker
     _host_blocker = HostBlocker(data_dir=context.data_dir,
                                 config_dir=context.config_dir,
diff --git a/qutebrowser/extensions/loader.py b/qutebrowser/extensions/loader.py
index 338449c5b..1a9b3d858 100644
--- a/qutebrowser/extensions/loader.py
+++ b/qutebrowser/extensions/loader.py
@@ -28,7 +28,7 @@ import pathlib
 
 import attr
 
-from PyQt5.QtCore import pyqtSlot, QObject
+from PyQt5.QtCore import pyqtSlot
 
 from qutebrowser import components
 from qutebrowser.config import config
diff --git a/scripts/dev/run_vulture.py b/scripts/dev/run_vulture.py
index 51662f3c9..f9262c946 100755
--- a/scripts/dev/run_vulture.py
+++ b/scripts/dev/run_vulture.py
@@ -130,6 +130,9 @@ def whitelist_generator():  # noqa
     yield 'scripts.get_coredumpctl_traces.Line.gid'
     yield 'scripts.importer.import_moz_places.places.row_factory'
 
+    # component hooks
+    yield 'qutebrowser.components.adblock.on_config_changed'
+
 
 def filter_func(item):
     """Check if a missing function should be filtered or not.