Bug 30541: Disable WebGL readPixel() for web content

    return false;

  }

  // Security check passed, but don't let content readPixel calls through for

  // now, if Resist Fingerprinting Mode is enabled.

  if (ShouldResistFingerprinting(RFPTarget::CanvasRandomization)) {

    JsWarning("readPixels: Not allowed in Resist Fingerprinting Mode");

    out_error.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);

    return false;

  }

  return true;

}