Hidden form fields do not reset to their orignal values on Refresh

If the value of a hidden form field is changed with JS after the page has loaded does this value get reset when the page is refreshed (F5) - all browsers?
Date Created: 3rd September 2007
Date Modified: 3rd September 2007
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In FF, the value of hidden fields is maintained between page refreshes, as it is with visible form fields.

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