You will be able to easily continue into the site with an unsupported supported browser once some changes go live in the next day or two. Sorry for the current issues.
Every time I see a "your broser is not supported" message I'm getting more angry. As a developer it's your job to make things work!
Yes, I'm using Opera and yes Opera only supports the standard. But common I checked it in other browsers and I can't see what's so special about the site that a "modern" browser is needed.