У вашего броузера проблема в совместимости с HTML5
A lot of people were having problems on getting the text document to switch to a actual CFG file.
I highly recommend you make two text documents and use one as a master that you can modify and keep. In order to modify the current user.cfg file you MUST delete it and make a new one.
Copy and Paste the following:
Render.DrawFPS 1
RenderDevice.ForceRenderAheadLimit 2
WorldRender.SpotLightShadowMapEnable 0
WorldRender.SpotLightShadowMapResolution 2
GameTime.MaxVariableFps 65
RenderDevice.TripleBufferingEnable 0
WorldRender.FxaaEnable 0
RenderDevice.Dx11Enable 0
Render.PerfOverlayEnable 0
PostProcess.DynamicAOEnable 0
Render.DeviceVSyncEnable 0
WorldRender.MotionBlurEnable 0
WorldRender.DxDeferredCsPathEnable 0