Can't drag tabs or bookmarks anymore

At some point Firefox stopped allowing me to drag tabs or bookmarks around. This includes moving tabs around in their order, dragging a tab into a new window, dragging tabs into bookmarks, moving bookmarks around in the browser. I can't drag them around in 'manage bookmarks' either. I can still open and create bookmarks; they are simply much more difficult to place where I want them. I believe this happened with the last update but it's not a feature I use all that often so it could be older. I have opened Firefox in safe mode and had the same issue. I have turned off the computer several times since this began. Any help would be appreciated.