with my barclaycard account, namely if you visit this URL: https://bcol.barclaycard.co.uk/as3/UI/#/login/ and then click "Or log in using your 16-digit card number instead?" then with the box to put the credit card number, months ago I put the wrong number, just one digit wrong, and now every time I visit that URL the wrong number appears in the autofill box, I have removed all my cookies for barclaycard.co.uk, I have cleared passwords, I have done the lot and the same wrong autofill number keeps appearing! it is highly frustrating! how do I stop this without completely uninstalling Thunderbird and erasing all stored data for all websites? I feel there ought to be a button to clear all stored data of all description for any specific domain name, or a button to clear all data on the webpage you are at.