diff --git a/qutebrowser/test/utils/test_signal.py b/qutebrowser/test/utils/test_signal.py
index 85f9db477..e8ea8d1ad 100644
--- a/qutebrowser/test/utils/test_signal.py
+++ b/qutebrowser/test/utils/test_signal.py
@@ -21,7 +21,6 @@
 
 import unittest
 from unittest import TestCase
-from unittest.mock import Mock
 
 import qutebrowser.utils.signals as sigutils
 
diff --git a/qutebrowser/utils/signals.py b/qutebrowser/utils/signals.py
index f37297468..253343787 100644
--- a/qutebrowser/utils/signals.py
+++ b/qutebrowser/utils/signals.py
@@ -18,10 +18,6 @@
 """Utilities regarding signals."""
 
 import re
-import logging
-from collections import OrderedDict
-
-from PyQt5.QtCore import QObject
 
 
 def signal_name(sig):
diff --git a/qutebrowser/widgets/statusbar/_progress.py b/qutebrowser/widgets/statusbar/_progress.py
index cab8f4402..0b95bb93c 100644
--- a/qutebrowser/widgets/statusbar/_progress.py
+++ b/qutebrowser/widgets/statusbar/_progress.py
@@ -61,6 +61,7 @@ class Progress(QProgressBar):
 
     @pyqtSlot(int)
     def on_tab_changed(self, idx):
+        """Set the correct value when the current tab changed."""
         tab = self.sender().widget(idx)
         self.setValue(tab.progress)
         if tab.load_status == LoadStatus.loading:
diff --git a/qutebrowser/widgets/webview.py b/qutebrowser/widgets/webview.py
index 3cca33869..d309ea802 100644
--- a/qutebrowser/widgets/webview.py
+++ b/qutebrowser/widgets/webview.py
@@ -89,6 +89,7 @@ class WebView(QWebView):
         self._force_open_target = None
         self._destroyed = {}
         self._zoom = None
+        self._has_ssl_errors = False
         self._init_neighborlist()
         self.progress = 0
         self.page_ = BrowserPage(self)