Getting "$doc.createStyleSheet is not a function" when injecting CSS on Firefox for GWT 2.6.0

Our application seems to behave correctly under GWT 2.5.1, and bundles CSS as follows:

public interface CssResourceBundle extends ClientBundle {

    CssResourceBundle INSTANCE = GWT.create(CssResourceBundle.class);

    @CssResource.NotStrict

    @Source("com/xxx/javascript/some.css")

    CssResource css();

}

with an entry point:

public class AnEntryPoint implements EntryPoint {

    static {

        CssResourceBundle.INSTANCE.css().ensureInjected();

    }

    @Override

    public void onModuleLoad() {

      // xxx

    }

}

However, after upgrading to GWT 2.6.0, we're seeing an exception (that prevents the CSS from being injected) on Firefox (but not for example on Chrome or Safari):

Mon Feb 10 22:39:53 GMT-500 2014 com.google.gwt.logging.client.LogConfiguration

SEVERE: (TypeError)

__gwt$exception: <skipped>

fileName: xxx lineNumber: 301

columnNumber: 21: $doc.createStyleSheet is not a functioncom.google.gwt.core.client.JavaScriptException: (TypeError)

__gwt$exception: <skipped>

fileName: xxx

lineNumber: 301

columnNumber: 21: $doc.createStyleSheet is not a function

Any suggestions for what may be going on here?

Thanks,

Pete

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