diff --git a/lector/dockwidgets.py b/lector/dockwidgets.py
index a4cd05c..4161b52 100644
--- a/lector/dockwidgets.py
+++ b/lector/dockwidgets.py
@@ -541,7 +541,7 @@ class PliantNavBarWidget(QtWidgets.QDockWidget):
         self.animation = QtCore.QPropertyAnimation(self, b'windowOpacity')
         self.animation.setDuration(200)
         self.animation.setStartValue(0)
-        self.animation.setEndValue(.9)
+        self.animation.setEndValue(.8)
 
         background = self.main_window.settings['dialog_background']
         self.setStyleSheet(
@@ -651,7 +651,6 @@ class FixedComboBox(QtWidgets.QComboBox):
         self.adjusted_size = screen_width // 6
 
     def sizeHint(self):
-        # This and the one below should adjust to screen size
         return self.minimumSizeHint()
 
     def minimumSizeHint(self):
diff --git a/lector/sorter.py b/lector/sorter.py
index e229ef8..fca919d 100644
--- a/lector/sorter.py
+++ b/lector/sorter.py
@@ -63,7 +63,7 @@ else:
     logger.error(error_string)
 
 # djvu - Optional
-djvu_check = importlib.util.find_spec('djvu.decode')
+djvu_check = importlib.util.find_spec('djvu')
 if djvu_check:
     from lector.parsers.djvu import ParseDJVU
     sorter['djvu'] = ParseDJVU
diff --git a/lector/toolbars.py b/lector/toolbars.py
index cf50b66..c60f066 100644
--- a/lector/toolbars.py
+++ b/lector/toolbars.py
@@ -217,7 +217,7 @@ class BookToolBar(QtWidgets.QToolBar):
             image_factory.get_image('page-double'),
             self._translate('BookToolBar', 'Double page mode (D)'),
             self)
-        self.doublePageButton.setObjectName('doublePageButton')            
+        self.doublePageButton.setObjectName('doublePageButton')
         self.doublePageButton.setCheckable(True)
 
         self.mangaModeButton = QtWidgets.QAction(