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Just a little tip
If you find yourself dealing with this Firefox bug, and are using the visibility property in your CSS, then stop it! If you move to using display instead you can avoid the bug.
For those not following, there is a bug in Firefox that prevents cursors and scroll bars from being painted when you have a div hidden on your page that overlaps another div that contains input items. So in my case I had a hidden drop down admin menu that overlapped a div that contained a form.