This is from my own perspective only, I don't/can't speak/write for others : I almost don't launch MozAppSuite any more. Only from time to time, to compare Nvu and Composer. I am working on Nvu, and I have no time to spend on Composer's obsolete front-end. I have switched from the Moz App Suite to Firefox+Thunderbird+Nvu. I never used Chatzilla because it can't display multiple channels at the same time.

So goodbye dear Moz App Suite. You were my first love in the World of Mozilla and a first love's never forgotten. You gave me very happy moments, good friends, and my best job since 1994 (at Grif SA). Thanks for the fish, and rest in peace.