I used an icon from Customize ToolBar that disappeared and disrupted my work organization. I don't know what it's called. It was on the right side of the Menu Bar next to Library icon and when I needed it I clicked on it to open the List of History/Bookmarks/Other Bookmarks on the left side of the screen. The icon was a square divided into two parts. In addition, the links I saved that I use often under site finder disappeared. Sincerely, S. Vlad