Java Applet Uploader bug in Gallery 2 + Firefox 3.0

This is a bug we've seen but have been unable to explain so far... for several people, all the Java-based Gallery 2 uploaders applets and apps are crashing the Firefox browser or putting it in an unstable state, preventing us from uploading pictures. Apache doesn't log anything wierd. The Java console isn't very eloquent (but it reports a few exceptions), but the browser doesn't get to show the applications that allow uploading files this way. There is, however, a solution, which is to have a *clean* Firefox getting to the uploader pages.