The Visual Page Editor requires the library libstdc++.so.5. This library is contained in the compat-libstdc++-33.i386 package.
To install this package on Fedora Core or Red Hat Enterprise Linux run the following command:
yum install compat-libstdc++-33.i386
On any other rpm based distributions download libstdc++.so.5 and run the following command:
rpm -Uvh compat-libstdc++-33.i386
On Debian based distributives run the following command:
apt-get install compat-libstdc++-33.i386
In case you have the library installed and you still have issue with starting the Visual Page Editor then close all browser views/editors and leave one Visual Page Editor open and restart eclipse. This should force a load of the right XULRunner viewer.
JBoss HTML/JSP editor uses basic eclipse HTML formatter to format files. So if you want to change preferences of formatter for the Visual Page Editor, you should change it for eclipse html editor (open Window > Preferences, then choose Web > HTML Files > Editor ).