Bug 1000175.  Make sure error events on window only fire if the active document has not changed from when the exception was thrown.  r=smaug
Bug 1012944.  Hide window.home/back/forward from web pages, since those are non-standard and cause pages to not set up their own thins with the same names.  r=peterv
Bug 999315.  Revert alert(undefined) to showing the string "undefined" again, like it used to, pending the spec getting sorted out.  r=peterv