diff --git a/aqt/__init__.py b/aqt/__init__.py
index 002b6f814..5aacc26d9 100644
--- a/aqt/__init__.py
+++ b/aqt/__init__.py
@@ -27,6 +27,7 @@ appUpdate="https://ankiweb.net/update/desktop"
 appHelpSite=HELP_SITE
 
 from aqt.main import AnkiQt
+from aqt.profiles import ProfileManager
 
 mw: Optional[AnkiQt] = None # set on init
 
@@ -130,7 +131,7 @@ dialogs = DialogManager()
 _gtrans: Optional[Any] = None
 _qtrans: Optional[QTranslator] = None
 
-def setupLang(pm, app, force=None):
+def setupLang(pm: ProfileManager, app: QApplication, force: Optional[str]=None) -> None:
     global _gtrans, _qtrans
     try:
         locale.setlocale(locale.LC_ALL, '')
@@ -303,7 +304,6 @@ def _run(argv=None, exec=True):
     opts, args = parseArgs(argv)
 
     # profile manager
-    from aqt.profiles import ProfileManager
     pm = ProfileManager(opts.base)
     pmLoadResult = pm.setupMeta()
 
diff --git a/aqt/browser.py b/aqt/browser.py
index 26901e42d..afa819877 100644
--- a/aqt/browser.py
+++ b/aqt/browser.py
@@ -10,6 +10,7 @@ import unicodedata
 from operator import  itemgetter
 from typing import Callable, List, Dict, Optional
 
+from anki.collection import _Collection
 from anki.lang import ngettext
 import json
 
@@ -512,6 +513,9 @@ class SidebarModel(QAbstractItemModel):
 # fixme: respond to reset+edit hooks
 
 class Browser(QMainWindow):
+    model: DataModel
+    mw: AnkiQt
+    col: _Collection
 
     def __init__(self, mw: AnkiQt):
         QMainWindow.__init__(self, None, Qt.Window)
diff --git a/aqt/deckbrowser.py b/aqt/deckbrowser.py
index f90b6b060..4223b5aa8 100644
--- a/aqt/deckbrowser.py
+++ b/aqt/deckbrowser.py
@@ -1,6 +1,7 @@
 # Copyright: Ankitects Pty Ltd and contributors
 # -*- coding: utf-8 -*-
 # License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
+from typing import Any
 
 from aqt.qt import *
 from aqt.utils import askUser, getOnlyText, openLink, showWarning, shortcut, \
@@ -14,6 +15,7 @@ from copy import deepcopy
 from anki.lang import _, ngettext
 
 class DeckBrowser:
+    _dueTree: Any
 
     def __init__(self, mw):
         self.mw = mw
diff --git a/aqt/utils.py b/aqt/utils.py
index 9a4ac7d99..6f8ef1423 100644
--- a/aqt/utils.py
+++ b/aqt/utils.py
@@ -426,7 +426,7 @@ def downArrow():
 ######################################################################
 
 _tooltipTimer: Optional[QTimer] = None
-_tooltipLabel: Optional[str] = None
+_tooltipLabel: Optional[QLabel] = None
 
 def tooltip(msg, period=3000, parent=None):
     global _tooltipTimer, _tooltipLabel