[Bug 38078] Firefox 37 and 38 fail to start

https://bugs.winehq.org/show_bug.cgi?id=38078

--- Comment #5 from Austin English  ---
> fixme:d3d11:D3D11CreateDevice adapter (nil), driver_type D3D_DRIVER_TYPE_WARP, swrast (nil), flags 0x20, feature_levels 0x7193c08, levels 0x4, sdk_version 7, device 0x34f134, feature_level (nil), context (nil) stub!
> Crash Annotation GraphicsCriticalError: |[0][GFX1]: Failed to initialize WARP D3D11 device!-2147024882[GFX1]: Failed to initialize WARP D3D11 device!-2147024882

wine's d3d11 support is just a stub. Try:
winecfg > Libraries > d3d11 > disabled

or run with:
WINEDLLOVERRIDES='d3d11=' wine ...

this is likely a dupe of bug 36828 (et al).