FireFox postdates AOL's financing of Mozilla, as does SeaMonkey. AOL does not own any "stock" in any of them, and has not been involved for some time AFAIK.
Sorry nihil...but Mozilla came first then Firefox...AOL was financing Mozilla before it even was called Mozilla...and then just before the development of Firefox AOL bailed as they were undergoing restructuring...but anted up a $2 million development fund that was used to create Mozilla and part to create Firefox.

But...you are right...they ( AOL ) appear to be uninvolved.

Eg