- Add
autocomplete="off"
onto<form>
element; - Add hidden
<input>
withautocomplete="false"
as a first children element of the form.
<form autocomplete="off" method="post" action="">
<input autocomplete="false" name="hidden" type="text" style="display:none;">
...
This formation is going to prevent Chrome and Firefox to offer autofill and autocomplete for all input fields inside the form.
You can try these steps one by one, I'm not sure which one suits your condition.
autocomplete="new-password"
to your input.name
autocomplete="new"
(Tested in some latest version of browser)