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Re:Mozilla Wants To Split Off Its Thunderbird Email/Chat Client by rplnt on Tuesday December 01, 2015 @09:31AM (#10655552)
Was it really HTML+JS? Because it was fast, many years back (used it just as an RSS reader though). Also, they shipped it as a standalone product[1], but I don't think it ever got updated after that.

1. http://www.opera.com/computer/mail

Re:Mozilla Wants To Split Off Its Thunderbird Email/Chat Client by gsnedders on Tuesday December 01, 2015 @12:22PM (#10657129)
From memory, it was C++, much like the rest of the Opera UI. It used Quick — Opera's in-house cross-platform UI toolkit, and it died (along with the rest of the old Opera) because Quick was heavily entwined with Presto.