What does the POST submission failure warning look like? Do you have either a screenshot, or the text, verbatim? Is it different from the POST data resubmission warning?
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To display this page, Firefox must send information that will repeat any action (such as a search or order confirmation) that was performed earlier.
[Resend] [Cancel]
That one is bug 160144 which has been stuck in limbo forever. You can only avoid it by opening the link in a new tab. So if you wanted to reload the page for instance, right-click the tab and choose Duplicate Tab. If you want to hit the Cancel button instead, you probably need to use an external utility that sends keystrokes or mouse clicks to programs.