Description of problem:
Following hack addressing some form refreshing bug on reload has a negative side effect:

    /* A bug/feature in Firefox exists where if you reload a page it will 
       cache some form field values but refresh others from the server,
       for example hidden fields. This script will force a full page reload
       if the reload button or context menu item is selected so that all 
       fields will have fresh data. The prior behaviour was causing certain
       changes such as flags to be overwritten unintentionally without 
       properly throwing a midair collision warning screen. */
    onload = function(){
        var e = document.getElementById("refreshed");
        if (e.value == "no") {
            e.value = "yes";
        } else {
            e.value="no";
            window.location.reload(true);
        }
    }

This reload also triggers when user returns back to the page using Back browser button.  As doing full reload takes some time, it can finish after you've done some edits to the page after returning to it, and hence it throws away your changes.  The above hack should not trigger when returning to the page.  Is there any reference with more info on the original problem?

Steps to Reproduce:
1. visit any show_bug.cgi page
2. follow any link in the bug (such as History)
3. press Back button and see how page is incorrectly reloaded