Firefox displays a popup on redirect
A form is posted to a save() controller method, which then redirects somewhere else. Why would Firefox display a popup saying "This web page is being redirected to a new location. Would you like to resend the form data you have typed to the new location?"
The problem appears to be in http://www.cherrypy.org/changeset/2149
Calling HTTPRedirect() with status=303 fixes this. Remember, this is a POST request which then redirects to a GET request, and I don't want that popup!