I've been testing out some Ajax code. When I open an XMLHttpRequest object, I get no response from the Firefox preview in WeBuilder. If I use the IE preview, it works fine. Deeper research showed that Firefox demands stricter compliance with cross-URL requests. It doesn't permit them. I tried a couple of things. First was to move the files I was testing to the root of my local server (WAMP, so they were moved to c:\wamp\www) and that did not work. Then I tried by launching the preview in external Firefox. That worked.
So the question is if there's a problem with what WeBuilder thinks is the source and target URL for an ajax request? Has anyone gotten an ajax request to work with the built-in Firefox preview?