Where does Mozilla Thunderbird store contact lists?

Mozilla Thunderbird stores contact lists in a file called "abook.mab" for the default address book, located in the user's Thunderbird profile folder. Additional address books may be stored in separate "mab" files, such as "history.mab" for collected addresses. In newer versions, Thunderbird uses the vCard format, and contact data can be found in the "contacts.sqlite" file. Users can access their profile folder through the Thunderbird settings or by navigating to the appropriate directory on their operating system.