Yahoo tells visitors that they should “upgrade to Firefox”

Yahoo! has started urging visitors to its homepage to “upgrade to the new Firefox” – even when they aren’t using the Mozilla browser in the first place. The message, along with a Firefox logo, has begun appearing for some users in the purple band along the top of Yahoo! ‘s portal pages. It’s displayed when the visitor is using an outdated version of Firefox, but it also shows up for any versions of rival browsers, such as Chrome or Internet Explorer.