At least in the thread pane, search UI, and filter UI, since there are RFC822 headers with both names. Maybe elsewhere too. Identical to bug 40394, except for Thunderbird.
I'm planning on doing this...
Comment 0 should have referred to bug 40934. *** This bug has been marked as a duplicate of 221724 ***
Cleanup *dupeme* whiteboard flag from bugs that are marked as Resolved Duplicate!