Contacts have disappeared from address book
Many of my contacts saved in address book in Thunderbird have disappeared and also the memory for typing existing email addresses into the email address line does not work so where I'd usually type the first few letters of an email and it gives me the rest of the email address this no longer happens.
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re ;also the memory for typing existing email addresses
There is no memory - it uses the address book, so if contacts are not in address book then they will not appear in the drop down. This explains why they are not appearing in the drop down autofill section.
Create a backup of your address book so that you do not lose any more contacts. In Address Book select the address book Tools > Export Save in a suitable location as either LDIF or comme separated.csv file.
Try this to recover contacts:
Download this addon to desktop:
How to install in Thunderbird Tools > Addons or Menu icon > Addons
click on gear wheel icon and select 'Install addon from file' locate the .xpi file you downloaded and click on Open You will need to restart Thunderbird.
In Address Book Right clickon the address book select 'MoreFunctionsforAddressBook' > 'Recover/Restore'