resetpanorama.js

/* Run this from your error console. WARNING: removes tabs from their existing groups! */
var Cc = Components.classes;
var Ci = Components.interfaces;
var wm = Cc["@mozilla.org/appshell/window-mediator;1"].getService(Ci.nsIWindowMediator);
var winEnum = wm.getEnumerator("navigator:browser");
while (winEnum.hasMoreElements()) {
  var win = winEnum.getNext();
  win.TabView._initFrame(function() {
    var contentWindow = win.TabView._window;
    contentWindow.UI.reset();
  });
  Array.forEach(win.gBrowser.tabs, function(tab) win.gBrowser.showTab(tab));
}