Ok, let me clear it up.
The WYSIWYG editor does work in Mozilla (I just found that out). vBulletin 3 was developed from scratch, they didnt just enhance the code from vBulletin 2.x.x. All of their HTML is XHTML compliant which is great news. vB is still in beta stages, and they just said the WYSIWYG bar is not currently working in Mozilla, but the next beta should be.