how to remove email addresses from autocomplete cache?

Hi - I am running Thunderbird release 140.12.1esr (aarch64) on a desktop Mac runnning Sequoia 15.7.3. Thunderbird is set up to take addresses from my personal address book. When I bring up Collected Addresses in the Thunderbird address book, there are no email [or any other kind of] addresses listed. Absolutely nothing in Collected Addresses within the Thunderbird address book. There are 21 email and other addresses listed in my Mac OSX address book. When I search my stored email messages, Thunderbird brings up each and every address that matches the string in my query. The matches appear to go back more than twenty years. I have searched the web on how to clear the autocomplete cache. There appear to be several different methods. I have tried bringing up the matches via the string and the resulting query, and then scrolling through the matches with the down arrow key. When I reach an address I would like to remove from the autocomplete cache, I have tried clicking on various combinations of keys. These combinations include: 1) Shift + Delete keys 2) Option + Delete keys 3) Command + Delete keys 4) Option + Command + Delete keys 5) Just the Delete key My intuition tells me the autocomplete cache must be stored somewhere in a file. I cannot conceive of the autocomplete cache being maintained across versions, hosts, etc. over a period spanning twenty years without getting stored in a file. Please enlighten me on how to clear out the junk email addresses in my autocomplete cache. Thanks in advance for your help. Regards, Corwin