Hi, I've this problem since a few months. I keep the toolbar "Bookmark Items" displayed in the upper right area, with the icons of the bookmarks. When I wanted to insert a new bookmark in the toolbar I was used to drag the "view site info" icon (left to the certificate icon) on this toolbar. Since last updates this dragging action causes the bookmark items toolbar to completely disappear. I have to restart Firefox to see the toolbar again. See the attached image for details. Thanks