I haven't read this entire thread So I don't know if this has been mentioned before. The WebUI did not seem to work in FF3 beta 2, though it fully worked in latest release FF2. I know both WebUI and FF3 are betas, but have not encountered any other problems with FF3 beta 2. I have posted same info to FF3 feedback. Basically, I saw the "loading" text, and then nothing.