In case anyone is curious, the browsers we test and support for ΩF include: the latest versions Firefox, Chrome, Safari (on Windows and Mac), and Internet Explorer 9+. IE8 will also work, just not as well. Opera will work, but we don't test it (it's far too edge-case).
The browsers we most recommend are: Chrome, Firefox, Safari.
Internet Explorer is generally a pretty horrible browser, and by using older versions of it you'd be losing out on a lot of nice stuff around the web. You're also putting yourself at a far greater security risk by running out-dated browsers from any vendor. Everything server-side on ΩF is locked down to excessively paranoid levels.