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Partial parallax effect issue on Firefox

I have a fixed background image in a wrapper which works ok when viewed in chrome but not in firefox, however, the main background image of the div shows ok in both.

.image-with-text-overlay-wrapper .homepage-featured-content-box{
  background-color: transparent !important;
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-position: center center !important;
  background-size: 30%;
  z-index: 1000!Important;

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