The (not so new now) Yahoo! Mail Beta has never liked Safari/ Webkit. However, it used to work fine on Camino – until recently that is. I guess Yahoo! has changed some stuff, because not only does it dislike Camino now, there is no longer an option to “continue anyway” on unsupported browsers. I don’t like using Firefox on Mac (which supports the Beta), so I needed to find a way to allow the Beta interface to load.