I am experiencing the same....
 here is some additional output i get on the error (look like a backtrace to me....).

java.lang.UnsatisfiedLinkError: NS_InitXPCOM3
	at org.eclipse.swt.internal.mozilla.XPCOM.NS_InitXPCOM3(Native Method)
	at org.eclipse.swt.browser.Browser.<init>(Browser.java:284)
	at org.eclipse.php.internal.debug.ui.views.DebugBrowserView.createPartControl(Unknown Source)
	at org.eclipse.ui.internal.ViewReference.createPartHelper(ViewReference.java:332)
	at org.eclipse.ui.internal.ViewReference.createPart(ViewReference.java:197)
	at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:566)
	at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:290)
	at org.eclipse.ui.internal.ViewPane.setVisible(ViewPane.java:525)
	at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:140)
	at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:268)
	at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)
	at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:394)
	at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1144)
	at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1097)
	at org.eclipse.ui.internal.PartStack.presentationSelectionChanged(PartStack.java:795)
	at org.eclipse.ui.internal.PartStack.access$1(PartStack.java:781)
	at org.eclipse.ui.internal.PartStack$1.selectPart(PartStack.java:123)
	at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation$1.handleEvent(TabbedStackPresentation.java:126)
	at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:267)
	at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:276)
	at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder.access$1(DefaultTabFolder.java:1)
	at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder$2.handleEvent(DefaultTabFolder.java:84)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1085)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1109)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1094)
	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:935)
	at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3171)
	at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1953)
	at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:288)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1085)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3180)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2856)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1930)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1894)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:422)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95)
	at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)
	at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
	at org.eclipse.core.launcher.Main.run(Main.java:977)
	at org.eclipse.core.launcher.Main.main(Main.java