[PROBLEM]
The feature "auto completion" for html-forms does not work when the website is opened with https://.
[SOLUTION]
This can't be fixed, because it's not a bug - it's due to security reasons. The form data for secured websites MUST NOT be stored anywhere on your local client.
...Because it might be your credit-card information that's stored on your harddrive and thus would be readable by another local user.