Keep on getting prompted for google accounts which I've deleted

Hello, I use Thunderbird to view multiple email accounts. In the past few months, I have deleted a couple of accounts (google based) from my Thunderbird accounts list. However, I continue to be prompted at regular intervals when using Thunderbird to enter my password credentials for these deleted accounts. (see screenshot) I can't see where it's referring to these deleted accounts as they're no longer in the accounts list - can anyone please help me with how I can stop these prompts continuing to appear? Thanks in advance for you help! Ranj