Aragorn

I have recently setup a small NVR system at my place of work. Using XVision cameras and a 4 channel XVision NVR. It all works quite nicely, but the NVR can only be accessed using Internet Explorer with a ActiveX plugin, or a software package installed on the PC. What i'm looking for, is any alternative NVR devices that can be used with the existing cameras, which can be accessed using modern browsers like Chrome and Firefox. Thanks