Bug 271022 JavaScript Console Error: Opening Non-Sidebar Windows in the Sidebar ("searchBox has no properties")

p=gavin.sharp@gmail.com r=mconnor

browser/base/content/browser.js

@@ -3491,6 +3491,7 @@ function asyncFocusSearchBox(event)
 {
   var sidebar = document.getElementById("sidebar");
   var searchBox = sidebar.contentDocument.getElementById("search-box");
+  if (searchBox)
     searchBox.focus();
   sidebar.removeEventListener("load", asyncFocusSearchBox, true);
  }