I've tried Chrome, Firefox, and IE on multiple computers. To clarify, while you can set "Percentage" (area) and "Sensitivity" and view live motion, you cannot select the area to monitor unless you are using IE. I've looked at the webpage source code and the comment above is correct about it using ActiveX. It seems like an older version of firmware. My other camera, a DCS-932?, uses a different plugin which works on Firefox and Chrome. Hopefully, in the future they will release an updated firmware that will match that model.