VPE editor does not work.

Could not open the Visual Page Editor: XPCOM error -2147467259
XPCOM error -2147467259

org.eclipse.swt.SWTError: XPCOM error -2147467259
at org.eclipse.swt.browser.Mozilla.error(Mozilla.java:2347)
at org.eclipse.swt.browser.Mozilla.initXULRunner(Mozilla.java:2310)
at org.eclipse.swt.browser.Mozilla.create(Mozilla.java:622)
at org.eclipse.swt.browser.Browser.<init>(Browser.java:119)
at org.jboss.tools.vpe.xulrunner.browser.XulRunnerBrowser.<init>(XulRunnerBrowser.java:94)
at org.jboss.tools.vpe.xulrunner.editor.XulRunnerEditor.<init>(XulRunnerEditor.java:142)
at org.jboss.tools.vpe.editor.mozilla.XulRunnerEditor2.<init>(XulRunnerEditor2.java:23)
...

eclipse.buildId=I20100608-0911
java.version=1.6.0_20
java.vendor=Apple Inc.
BootLoader constants: OS=macosx, ARCH=x86, WS=cocoa, NL=en_US
Framework arguments: -keyring /Users/rasp/.eclipse_keyring -showlocation
Command-line arguments: -os macosx -ws cocoa -arch x86 -keyring /Users/rasp/.eclipse_keyring -showlocation

Note that this happens also with cocoa x64, but I guess that's expected due to JBIDE-4523 .