Looking at my inbox (or any other folder) if I double click on the subject, correspondents/from, date etc cell of any row, I would like Thunderbird to search that column for items that match the cell I've double clicked.
For example, if I double click on "Thunderbird is awesome" in the subject cell of a particular email, Thunderbird would return a list of emails, in any folder/mailbox, where the subject is "Thunderbird is awesome".
This is a feature of Mailmate (https://freron.com/).