I'm guessing a port of Firefox is asking too much!?
Probably asking too much for a single programmer. However, if the Gecko rendering engine is ported then you would be one step closer to Firefox on AROS.
Firefox would be nice and all, especially with all the brilliant plugins (I've got around 14 installed, some of which are invaluable). However, any web browser program with modern features is going to be a huge bonus for AROS. I imagine it would be a useful template for a new OS4 browser too.