OS X Yosemite User: iTunes 12.8.1 Update verursacht wohl Safari 10.1.2 Probleme ...
Still Running OS X Yosemite? Beware, iTunes 12.8.1 Breaks Safari:
https://www.macrumors.com/2018/12/14/itunes-12-8-1-breaks-safari-on-osx-yosemite/
https://www.macrumors.com/2018/12/14/itunes-12-8-1-breaks-safari-on-osx-yosemite/