Address autocomplete feature proposes old invalid addresses not even in Address Book

Question

When I start writing a recipient's name in an email I'm composing, Firefox accesses an unknown database to propose several addresses I have used previously. These often include old addresses for my recipient that are no longer valid. In fact, more often than not these invalid addresses appear first, so if I just press Enter without thinking, that's where the message will be sent. Additionally, the proposed addresses often do not include addresses for the recipient that are in my Firefox Address Book. So it's a dual problem: I get bad addresses from some mysterious database, plus I don't get valid addresses from the Address Book. I need to know where this database that Firefox is accessing is located on my computer and how to edit it to remove all those invalid addresses I keep using inadvertently, and also how to get the autocomplete function to search the Address Book, which it is not doing. I should mention that in Tools - Options - Composition - Addressing, I have "Local Address Books" check-marked, and "Directory Server" is not checked. This is the only tool I've found in Firefox that seems to be related to this problem.

Answer 1

Thank you for replying, Zenos, but I assure you I removed these obsolete addresses from the Address Book (including subdirectories I'd made in it). Hoping I was wrong, I anxiously tried your solution, but it doesn't seem to work. I'm not given an "Edit contact" option when I right-click on the address in a message I've put in the Drafts folder. The only options I'm given are "Add to Address Book..." (which is the opposite of what I want to do!), "Compose Mail To", "Copy Email Address", and "Create Filter from Message...". If I could actually do what you propose - access the actual record Firefox is using in the database and alter it - that would be perfect. I still believe it is accessing some other database, not Address Book. But thanks for trying to help!