How can two identical versions of Firefox with identical plug ins behave differently on two machines?

I'm a desktop support student, currently stumped at this user's issue, any advice would be fantastic:

User is developing an app with another user, both users are working on it internally but is being tested externally on various browsers.
One part of the app involves sending the contents of a form to a server (done by button click), this works fine on first user's Firefox but not on the other user's.

Both have the latest version of Firefox and have the same plugs ins enabled/disables (I think all are disabled)

TIA!

J
Jonnie BassettAsked:
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Scott Fell, EE MVEConnect With a Mentor Developer & EE ModeratorCommented:
Is the form submitting directly to a server side page like

<form method="post' action="mypage.php">
     <input name="test">
      <button type="submit">submit</button>
</form>

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or is it using javascript/jquery to submit and perhaps an ajax request?

<script src="jquery.js">
<script>
$(function(){
   $('btn1').on('click',function(){
        // code to submit or ajax
    });
});
</script>
<form method="post' action="mypage.php">
     <input name="test">
      <button id="btn1" type="button">submit</button>
</form>

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If you can post an excerpt of the form code it may help.  Typically when you are posting directly to a server side page, there should not be an issue.  Also, are the two computers on the exact same network?
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Dave BaldwinFixer of ProblemsCommented:
Two things:  1. You have not told us what the differences are so we would just be guessing at this point.  2.  Within minutes after first boot, there is no such thing as 'identical' computers.  Little differences start occurring almost immediately.

The key in your situation is to find out what the differences are and then what to do about them.
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Jonnie BassettAuthor Commented:
Turned out to be an issue with exceptions, thanks for your help!
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