When using a very badly designed add-on to delete what I thought were Sync settings, I instead deleted an address book. I have four address books in addition to "person" and "collected," but I should have five. There is lots of valuable info in that fifth one. I've found the SQLITE files that I believe are my address books, but I don't understand the naming conventions like this: abook-3.sqlite abook-3.sqlite-shm abook-3.sqlite-wal abook-3.v3.sqlite abook-4.sqlite abook-4.sqlite-shm And I don't understand how to either (a) identify the address book I want to recover (I have backups), or (b) re-instate it in Thunderbird. Any help, suggestions or pointers to previously-written directions for this situation would be much appreciated.