Update your OS.
For browsers: FF, Edge and IE have realeased updates. For Chrome:
Option "Website-Isolierung" zu aktivieren. Dazu muss man chrome://flags/#enable-site-per-process in die Adressleiste eingeben und hinter "Strict site isolation" auf den Button "Aktivieren" klicken.
Enter "chrome://flags/#enable-site-per-process" in Adress bar and click on "activate" after "Strict site isolation).
thanks a lot