Upstream regression Mars 4.5.0 XULRunner Bug 472956
Basically, XULRunner crashes when profile path does not exist. The workaround is to create profile folder `C:\Users\<USER_NAME>\AppData\Roaming\Mozilla\eclipse` manually. More details can be found in the reply to the original upstream issue and in the related developer.jboss.org discussion - https://developer.jboss.org/message/938755