> I doubt Microsoft wants support calls about how someone clicked on their widget and the resulting page didn't render properly because user was on X browser.

> I doubt Microsoft wants support calls about how someone clicked on their widget and the resulting page didn't render properly because user was on X browser. It's not "X browser", it would be just Firefox with its workaround. And it's common practice to design websites with support for major browsers, so it shouldn't be such a huge burden letting users pick a browser.