Rated 4 out of 5 stars

The concept seems great. On Thunderbird 102.7.1 though, diplaying a mail involves the display of the note visibly three times.
Also what I am looking for is notes that are stored in the message's header on the IMAP server, so that notes are visible and shared amongst people handling an inbox. It would be great if this be an option in the « storage path » section of the addon Preferences.

This review is for a previous version of the add-on (3.3.5).