Example is intent url, so I guess that https://searchfox.org/mozilla-central/rev/162a9137664040430d01d15c4a9be41c331c09ac/mobile/android/geckoview/src/main/java/org/mozilla/gecko/util/IntentUtils.java#118 should check `fido` too.
Bug 1974025 Comment 10 Edit History
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I will look it