No, I don't think they are supported.
It looks like Custom Filters were at one point in time (way back in 2013)
defined in the Filter Effects spec, e.g. see this snapshot from 2013:
https://www.w3.org/TR/2013/WD-filter-effects-1-20131126/#custom-filter
...but they were removed from the current version of that spec in early
2014 -- here's the current spec:
https://drafts.fxtf.org/filter-effects/
(See note "Removed custom filters" near the bottom)
Here's the spec-commit where they were removed ("per WG resolution"):
https://hg.fxtf.org/drafts/rev/31fa1bca0c71
...and here's the notes from the working group meeting where they were
removed:
https://lists.w3.org/Archives/Public/public-fx/2014JanMar/0066.html
On Mon, Oct 22, 2018 at 6:10 AM <smukhtar0...@gmail.com> wrote:
> Are CSS Custom Filters supported in Mozilla Firefox? I can't seem to find
> any information on them.
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