I totally agree with six gun : this is a great extension, works fine even for those who don't dispose of DevalVR - the extension also works with quicktime. It's easy to install and to use.
BUT, the extension can't work with IE7 and this really a bad limitation - i've desinstalled the extension because of that. The whole page can't even be load with IE7.
So i'm now waiting for an IE7 compatible version of DevalVR.... hope it won't be long.