A new problem has arisen in Safari prefs and Videos on my mac since upgrading to 10.15.2 - Buttons in Safari's preferences have a red colour as they load, a bit like a background highlight. It only lasts a fraction of a second as the pages drops down but it has the feel and look of a virus. And, Video's from places like Youtube have a highlight colour usually green like a badly compressed or incompatible clip, again as if quicktime has a virus and only since the update to 10152? Shame there isn't an open firmware reset anymore to weed out all the possibilities. Any help would be much appreciated