isn't morphos something built on mui?
The desktop (Ambient) is built on it. Naturally you can use whatever GUI system in your own apps, boopsi, gadtools, classact, bgui or whatever.
is there / will there be a firefox / java for morphos?
In my personal opinion Firefox or Java are unlikely to happen for any amiga like system (AmigaOS 3.x, 4.x, MorphOS or AROS).
There's
AmiZilla and
JAmiga, but a lot should happen before these projects are finished.
will my 68k binaries run under morphos?
Assuming they're OS friendly, yes.
if the answers are yes (except for mui which i dislike), i should give it a closer look.
Out of interest, what's wrong with MUI?