Some DOM panel cleanup
Don't treat all user-defined properties as event handlers
Issue 6183: Closure Inspector: some variables are treated as DOM properties

http://code.google.com/p/fbug/issues/detail?id=6183
Better recognition of DOM constants

Related to issue 5418.
Issue 6187: Some elements shown as non-expandable in the DOM panel

http://code.google.com/p/fbug/issues/detail?id=6187
Add some constants from applicationCache