I believe I have the materials. I just cannot work out or find out how to put them together.
Thunderbird displays x-face images in emails received.
I have the code for an image, obtained from an online service
I have the Mnenhy extension
and have added an x-face header but do not know how to configure it.
Google turned up a comment in a bug report
which did not help and nothing else that explained what to do.
Some people have evidently worked out how to do this. Can anyone here explain it?