I have a couple of questions. How stable is 4.0 beta for Firefox? Clearly there are going to be issues, but in terms of every day use, is it fairly ok? Second, is there any way I can update/upgrade my 3.6.7 to 4.0, or do I have to uninstall, and reinstall? And yes I know I can run a portable version of 4.0, I don't want that.