backdrop-filter is not supported on Firefox, even on the latest version. An alternative to use would be the ::backdrop pseudo-selector. Or, just use SVG Filters, as in this codepen (Not by me).
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backdrop-filteris not supported on Firefox, even on the latest version. An alternative to use would be the::backdroppseudo-selector. Or, just use SVG Filters, as in this codepen (Not by me).