It usually appears when you attempt to refresh a page reached through a form submission.
Suppose you have paid for your online purchases.
If you refresh the page, your card may be charged twice if the error does not appear.
Valeriy Odintsov
Lets take a closer look at this pop-up below and how you might get rid of it.
Why does the Confirm Form Resubmission pop-up appear?
The Confirm Form Resubmission message appears primarily because of the HTTP POST method used when submitting forms.
So heres what you might do.
So you better use the GET method, which does add the data to the URL.
The only downside here is that GET does not keep this data private.
Which method you use will depend on your specific needs.
If you use a framework, there may be a built-in way to prevent form resubmission.