Bug 614609 - Hitting 'Find in page' after the find in page is already up with text in it will disable the arrows until you type [r=mfinkle]

mobile/chrome/content/browser-ui.js

@@ -1743,7 +1743,8 @@ var FindHelperUI = {
 
   show: function findHelperShow() {
     this._container.show(this);
-    this.search("");
+    this.search(this._textbox.value);
+    this._textbox.select();
     this._textbox.focus();
     this._open = true;