changing/ editing the autocomplete function - when composing an email it searches for any addresses with that letter in it, not just those that start with it.
So when writing a new email and I type in any letter, Thunderbird brings up all addresses that have that letter (rather than just those that start with that letter).
Alle antwurden (1)
Try it with the MoreFunctionsForAddressBook add-on installed (see picture).
https://support.mozilla.org/en-US/kb/installing-addon-thunderbird