Thunderbird 60.0 Released With WebExtension Themes, Attachment Improvements

In Summary :

For those of you that have been waiting for a big update to the Thunderbird mail/RSS client, Thunderbird 60.0 is now available with plenty of changes.

Thunderbird 60.0 is shipping today with enhancements for adding attachments while composing emails, new light/dark themes, support for WebExtension themes, support for setting update intervals on individual RSS/atom feeds, OAuth2 authentication support for Yahoo and AOL, FIDO U2F support, converting mbox to/from maildir format, calendar improvements, native notifications on Linux are now re-enabled, and a variety of other enhancements and fixes. [...]

kindly refer the following link as follow up :
https://www.phoronix.com/scan.php?page=news_item&px=Thunderbird-60-Released