It fails during start, right?
The problem might be that eclipse trying to instantiate internal browser based on mozilla to show Intro. Try add line below
It will switch eclipse to using external browser and SWT version of Intro.
easy-jboss-ide-aop 2.0.0.beta ? That does not look like something related to JBoss Tools ?
In any case the problem is most likely XULRunner/Mozilla issues. Follow Denis instructions and let us know how that goes.