And here I was about to say that it had simply become Mozilla Firefox.
I guess I pruned my knowledge (read: forgot) at some point because I know I went from using Netscape to the Mozilla Application Suite as my browser of choice, and then ultimately onto Firefox when that died. (Firefox and Thunderbird were well established and Seamonkey was still in its infancy, otherwise I probably would have switched to that instead.)
Looking at the facts, the AOL buy-out is what must have got me to switch to MAS.