update source code from the newst xpi(0.4b2.2013051811)
Firefox 22 removed parameter 'in nsISupportsArray properties'
from 3 methods of nsITreeView:
getCellProperties,getColumnProperties,getRowProperties.

Firefox 27 introduced a new findbar API, replacing the old one.

With this patch, we support both new APIs and old APIs.

Tested in Firefox 17 and 30