To achieve this I set the following property in my GWT module's *.gwt.xml file:
Well, as it turns out, this caused me quite some pain in hosted mode. I did not realize that the aforementioned setting affects hosted mode. I new that under Windows Internet Explorer (IE) is the default browser but always assumed it only affects fully compiled GWT code - not code running in hosted mode. That was a painful lesson - It caused some rather obscure errors in hosted mode and nowhere were I able to find explicit information regarding this issue.