I recently installed Thunderbird version 78.2.1 on MacOS High Sierra 10.13.6 and I need to be able to export emails in csv format. I am unable to add the importexport add-on( downloaded latest version 4.1.0-tb.xpi- see attached screenshot) I am getting the error message-"ImportExport Tools NG could not be installed because it is not compatible with Thunderbird 78.2.1"( see attached error screenshot) I am using the navigation to add the add-on from Thunderbird>Tools>Add-ons> Click on Wheel icon>Install Add-on from File> select Adds-on from Downloads folder on Mac Can anyone please advice on how to add import-export adds on to Thunderbird version 78.2.1 and the correct adds-on version? Thanks Kayd