diff --git a/qutebrowser/browser/adblock.py b/qutebrowser/browser/adblock.py
index e7131640f..0069fe7e3 100644
--- a/qutebrowser/browser/adblock.py
+++ b/qutebrowser/browser/adblock.py
@@ -259,8 +259,8 @@ class HostBlocker:
                 self._blocked_hosts.add(host)
         log.misc.debug("{}: read {} lines".format(byte_io.name, line_count))
         if error_count > 0:
-            message.error("adblock: {} read errors for {}".format(error_count,
-                                                                  byte_io.name))
+            message.error("adblock: {} read errors for {}".format(
+                error_count, byte_io.name))
 
     def on_lists_downloaded(self):
         """Install block lists after files have been downloaded."""
diff --git a/qutebrowser/mainwindow/messageview.py b/qutebrowser/mainwindow/messageview.py
index 43ad1a132..fe96af822 100644
--- a/qutebrowser/mainwindow/messageview.py
+++ b/qutebrowser/mainwindow/messageview.py
@@ -69,6 +69,8 @@ class Message(QLabel):
 
 class MessageView(QWidget):
 
+    """Widget which stacks error/warning/info messages."""
+
     reposition = pyqtSignal()
 
     def __init__(self, parent=None):
@@ -87,13 +89,16 @@ class MessageView(QWidget):
 
     @config.change_filter('ui', 'message-timeout')
     def _set_clear_timer_interval(self):
+        """Configure self._clear_timer according to the config."""
         self._clear_timer.setInterval(config.get('ui', 'message-timeout'))
 
     def message_height(self):
+        """Get the total height of all messages."""
         return sum(label.sizeHint().height() for label in self._messages)
 
     @pyqtSlot()
     def _clear_messages(self):
+        """Hide and delete all messages."""
         for widget in self._messages:
             self._vbox.removeWidget(widget)
             widget.hide()
@@ -105,6 +110,7 @@ class MessageView(QWidget):
 
     @pyqtSlot(usertypes.MessageLevel, str)
     def show_message(self, level, text):
+        """Show the given message with the given MessageLevel."""
         if text == self._last_text:
             return
 
diff --git a/qutebrowser/mainwindow/statusbar/bar.py b/qutebrowser/mainwindow/statusbar/bar.py
index 5e67e7d4e..1645ce583 100644
--- a/qutebrowser/mainwindow/statusbar/bar.py
+++ b/qutebrowser/mainwindow/statusbar/bar.py
@@ -19,10 +19,7 @@
 
 """The main statusbar widget."""
 
-import collections
-
-from PyQt5.QtCore import (pyqtSignal, pyqtSlot, pyqtProperty, Qt, QTime, QSize,
-                          QTimer)
+from PyQt5.QtCore import pyqtSignal, pyqtSlot, pyqtProperty, Qt, QSize, QTimer
 from PyQt5.QtWidgets import QWidget, QHBoxLayout, QStackedLayout, QSizePolicy
 
 from qutebrowser.config import config, style
diff --git a/qutebrowser/misc/guiprocess.py b/qutebrowser/misc/guiprocess.py
index e8e0d579e..eb0a036e5 100644
--- a/qutebrowser/misc/guiprocess.py
+++ b/qutebrowser/misc/guiprocess.py
@@ -153,8 +153,8 @@ class GUIProcess(QObject):
             log.procs.debug("Process started.")
             self._started = True
         else:
-            message.error("Error while spawning {}: {}.".format(self._what,
-                                                                self._proc.error()))
+            message.error("Error while spawning {}: {}.".format(
+                self._what, self._proc.error()))
 
     def exit_status(self):
         return self._proc.exitStatus()
diff --git a/qutebrowser/utils/message.py b/qutebrowser/utils/message.py
index ffa619a4a..43c820ad1 100644
--- a/qutebrowser/utils/message.py
+++ b/qutebrowser/utils/message.py
@@ -25,7 +25,6 @@
 import traceback
 
 from PyQt5.QtCore import pyqtSignal, QObject
-from PyQt5.QtWidgets import QApplication
 
 from qutebrowser.utils import usertypes, log, objreg, utils
 
diff --git a/scripts/dev/run_vulture.py b/scripts/dev/run_vulture.py
index f406aea97..3d8fa7e17 100755
--- a/scripts/dev/run_vulture.py
+++ b/scripts/dev/run_vulture.py
@@ -86,6 +86,7 @@ def whitelist_generator():
     yield 'qutebrowser.utils.log.QtWarningFilter.filter'
     yield 'qutebrowser.browser.pdfjs.is_available'
     yield 'QEvent.posted'
+    yield 'log_stack'  # from message.py
     # vulture doesn't notice the hasattr() and thus thinks netrc_used is unused
     # in NetworkManager.on_authentication_required
     yield 'PyQt5.QtNetwork.QNetworkReply.netrc_used'
diff --git a/tests/unit/misc/test_guiprocess.py b/tests/unit/misc/test_guiprocess.py
index 01239b198..4341284df 100644
--- a/tests/unit/misc/test_guiprocess.py
+++ b/tests/unit/misc/test_guiprocess.py
@@ -189,7 +189,7 @@ def test_error(qtbot, proc, caplog, message_mock):
 def test_exit_unsuccessful(qtbot, proc, message_mock, py_proc, caplog):
     with caplog.at_level(logging.ERROR):
         with qtbot.waitSignal(proc.finished, timeout=10000):
-                proc.start(*py_proc('import sys; sys.exit(1)'))
+            proc.start(*py_proc('import sys; sys.exit(1)'))
 
     msg = message_mock.getmsg(usertypes.MessageLevel.error)
     assert msg.text == "Testprocess exited with status 1."
diff --git a/tests/unit/utils/test_utils.py b/tests/unit/utils/test_utils.py
index 99439a583..73252ddc4 100644
--- a/tests/unit/utils/test_utils.py
+++ b/tests/unit/utils/test_utils.py
@@ -21,7 +21,6 @@
 
 import sys
 import enum
-import datetime
 import os.path
 import io
 import logging