Form field data history not retained

I have a form on a page that is shown via https:// as follows:

<form id="memberslogin_form" name="memberslogin_form">
<fieldset>
 <legend>Login</legend>
 <div>
  <label for="membershipId">Membership number</label>
  <input type="text" class="field" name="membershipId" id="membershipId""/>
 </div>
 <div>
  <label for="memberPassword">Password</label>
  <input size="18" type="password" class="field" maxlength="50" name="memberPassword" id="memberPassword" />
 </div>
 <div id="button_login">  
  <input type="button" value="Login" class="bu开发者_Go百科tton" id="signin" name="signin"/>
 </div>
</fieldset>
</form>

The form is uniquely named, as are the inputs.

However, successful logins do not cause the "membershipId" entries to be listed in the input recent entries \ history. This occurs in both FF3.6 and IE6+.

I believe the ability to store field history is browser-based via it's settings, but I cannot retain the input history over https:// forms?

Is this a typo in here only, or in actual page:

<input type="text" class="field" name="membershipId" id="membershipId""/>

See the extra ".

I don't know much about the mechanism of saving form value in FF, but all this time, my form input is saved even if it in https site.

Maybe you can try lastpass that can save a form input for later usage as well as the password securely.