Firefox will remember the input values and the element disabled states
which were dynamically set after a page reload or after returning to a page
via the back/forward navigation controls. This destroys the ability to set
a defaultDisabled property on each templateElement on the basis of the
elements disabled value, since all remplateElements are disabled on
DOMContentLoaded to prevent them from being 'successful'.

A workaround requiring authors to additionally include a className of
'disabled' on all disabled elements within the repetition template.

See discussion at Gervase Markham's blog for more info:
<http://weblogs.mozillazine.org/gerv/archives/2006/10/firefox_reload_behaviour.html>

See also test case #11.