Yes Firefox should complete the [backdrop-filter](https://developer.mozilla.org/en-US/docs/Web/CSS/backdrop-filter). It's not an experimental feature. Currently we have to enable this feature in Firefox config manually. But I just wonder: Why not just enable it by default and fix bugs if required or in other words just complete it. Chrome has done it since years. But I remember this feature also was disabled by feature, until someone pushed this feature with a comment like this on its issue tracker. ... So please just do it! And or give some statement about it.