User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.1) Gecko/20060124 Firefox/1.5.0.1 Build Identifier: Thunderbird 1.5 (20051201) If the quoted text author is First Last, quote their text as FL> Optionally, if it's First, use Fi> and if it's First M. Last, use FML> A screenshot of a fidonet message editor with such feature: https://bugzilla.mozilla.org/attachment.cgi?id=93939&action=view Reproducible: Always This was also mentioned in https://bugzilla.mozilla.org/show_bug.cgi?id=13818

This is highly unlikely to ever be implemented as part of the product. Possibly as an extension, altho the code probably needs to be tweaked to support such an extension. xref bug 89954, and especially bug 89954 comment 15 & 16.