Thanks. I opened the Browser Sim but as indicated here https://community.jboss.org/wiki/BrowserSimFAQ it also does not work on 64 bit eclipse.
I tried to change the eclipse.ini in hope to run on 32 bit instead of 64 bit. However, it does not work:
-vmargs
-d32
That means, I have to install 32 bit version of eclipse and set up my plugins and workspace again (tedious work;(.