Actually, Galeon seems to support any plugins that Mozilla does. I'm running Galeon 1.0 (with Mozilla 0.96) on Linux, and I have both the Flash player and the blackdown Java plugin enabled in both Mozilla and Galeon. All you need to do is set them up to work in Mozilla, and they "automagically" work in Galeon.
Actually, Galeon seems to support any plugins that Mozilla does. I'm running Galeon 1.0 (with Mozilla 0.96) on Linux, and I have both the Flash player and the blackdown Java plugin enabled in both Mozilla and Galeon. All you need to do is set them up to work in Mozilla, and they "automagically" work in Galeon.