Steps to reproduce:

1. Install BrowserSim plugins only into Eclipse (or remove org.jboss.tools.jst.jsp plugin from your Eclipse/JBDS installation)
2. Open a web site in Eclipse, e.g. http://jboss.org
3. Select View Source from the menu

Actual result:

4QAs how to test it easier:

1. Go to Eclipse Preferences > General > Editors > File Assotiations > *.html
2. FOR every editor in the Associated Editors list Do
   1. Select as Default > OK
   2. BrowserSim > go to a web site (e.g. http://jboss.org) > View Page Source
   3. Check the editor view