Contact Photos

An (XPI-based) Thunderbird add-on forked from https://addons.mozilla.org/en-US/thunderbird/addon/contact-photos.

Notable additions:

Photos based on first To recipient in Sent, Drafts, and Outbound folders
First choice of photos (after the Address Book's card) is {ProfileDir}/Photos/[email protected] where ext is the first match of {svg, png, gif, jpg, jpeg, ico, bmp}
Second choice of photos is a configurable Online User Directory for corporate badge photos
Third choice of photos is Gravatar (if enabled and online). This is not new.
Now supporting RoboHash Gravatars

You can download my fork of Contact Photos 1.0.1 here:

contact_photos+adamhotep-1.0.1-2.xpi

See also

Contact Photos forum announcement I have updated Contact Photos to support showing recipients, more

Note, it is not signed; you may need to tweak your about:config to allow that.