Modify suject email version 68

How to modify suject email in Thunderbird version 68 and more?..

There used to be an extension, EditEmailSubject, that made it possible to edit the subject. But it can’t be installed in 68.

I have tried to change the max version in the install.rdf, but it doesn’t work.

I would really appreciate if someone could fix this!

The extension developers support site link is on the page you provided. You need to contact them.

Unfortunately non of the links works, or point to anything useful. I don’t think that the 6admin. company will respond to this…

Has there been a major change in how extensions are programmed in the latest Thunderbird?

Add-on support: Add-ons are only supported if add-on authors have adapted them

TB 68.0 Release Notes