Why Isn't My SVG Data URI Displaying as a Background Image in My Pseudo-element?

SVG Data Image Not Behaving as Background Image in Pseudo Element

When attempting to set an SVG as a background image for a pseudo element using the following code, it fails to display in Firefox:

content: '';
position: absolute;
 right: 0;
bottom: 0;
  left: 0;
width: 100%;
height: 12px;

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