Rated 5 out of 5 stars

by Joni Joni on Jan. 27, 2010 ·

"Why not set mail.showCondensedAddresses instead?"
Because it isn't the same. Using about:config is the same option as you can find it in Options-> Advanced -> Read & View. Using this addon your name gets viewed as is and not replaced by 'You', while all other recipients you've got in your address book are displayed only by their saved names as well.