Comment 17 for bug 1761844

The fix by bugrasan works OK and gets the emojis down to normal size however the emoji's are no longer colour but black and white. This is at least a good workaround for the time being.

I think you will find this problem will be fixed in a later version of Thunderbird. I downloaded Thunderbird 60 Beta tar.bz2 from their website. Without actually installing it I extracted the folder and ran that version of Thunderbird from within that folder. It will automatically pick up you settings and email addresses etc from the version you have installed.

It worked fine and the emojis contained in this version of Thunderbird are of normal size and are coloured.