Rated 5 out of 5 stars

As I remember, one or two years ago you made this addon free and said there will be no more development. Now I found out it is paid again. Does it mean that you have new development plans? And whether users can send you their suggestions regarding addon's functionality?

This review is for a previous version of the add-on (60.1). 

Thanks for your good rating. It's always motivating when people enjoy the hard work that went into it.

We are planning to keep the extension working with new Thunderbird versions. This is extensive work, given the constant changes in the Mozilla platform. We plan to do that as long as it's technically and financially feasible. We're currently porting it to Thunderbird 68.

For future development, take a look at Owl, which is a completely new extension of the latest MailExtension type.