This article explains how to find emails in Mozilla Thunderbird using the Thunderbird search bar, quick filters, and advanced search tools.
How to Setup Gmail in Mozilla Thunderbird
The quickest option is to use the search bar above your messages. Select the search field and type a person’s name, email address, or keyword that might appear in the subject of the message. If there are multiple matches, select one of the autocomplete options.
Select Quick Filter at the top of Thunderbird to see a list of search filters. Select one or more of the filters below to see all messages that match your criteria. For example, selecting Attachment will show all messages with attachments. Use the search bar below Thunderbird's main search bar to further refine your matches.
Thunderbird offers more search features to help you find exactly the email you're looking for.