Rated 1 out of 5 stars

Using for one account sent to myself, and one of the two other recipients.

Also didn't recognise the identity I was posting from.

Rated 3 out of 5 stars

>>yes, right click context menu is a good idea. I will add that and also keyboard activation.

If ++ doesn't work due to the other addon - why give 2 stars only to us, if it is them?
>>The button is inserted by the new TB addon system, not by us. I will send them a bug report.

I can't believe this site doesn't allow me to reply to a reply! Strange!
Anyways, first thank you for replying promptly. Well, we all, meaning my coworkers, use mail header addons which seem to be very popular. Once you add to either context menu and/or the mail toolbar, I promise to change it to 5 stars and also make a small donation :). Kindly post here when you are done. Thank you very much.

Léirmheas ar leagan níos sine den bhreiseán seo (2.0).  Rinne an t-úsáideoir seo léirmheas ar an mbreiseán seo cheana.

you can use this for issues/feature requests: https://github.com/opto/New-Thread-To-All/issues

New version 2.1 is uploaded and in the review queue.

Rated 5 out of 5 stars

Very useful, is it possible to update it to latest thunderbird version 78.5.0?

Léirmheas ar leagan níos sine den bhreiseán seo (1.2.0). 

Rated 5 out of 5 stars

Great idea! Is it technically an answer (related ID to the original mail) or a completely "new" mail, which is created using all the addresses?

Léirmheas ar leagan níos sine den bhreiseán seo (1.2.0). 

It is a completely new email - no reference to old 'email trees'.
So it starts a new thread.