--- a/eric6/WebBrowser/AdBlock/AdBlockSubscription.py	Tue Oct 13 19:02:26 2020 +0200
+++ b/eric6/WebBrowser/AdBlock/AdBlockSubscription.py	Wed Oct 14 17:50:39 2020 +0200
@@ -471,9 +471,8 @@
         @rtype bool
         """
         try:
-            f = open(fileName, "r", encoding="utf-8")
-            data = f.read()
-            f.close()
+            with open(fileName, "r", encoding="utf-8") as f:
+                data = f.read()
         except (IOError, OSError):
             return False