`OS.File.macSetXAttr` is only used in the [attribution code telemetry tests](https://searchfox.org/mozilla-central/rev/5122357c497684e01c5bb2d4a9bf8be1fe97a413/browser/components/attribution/test/browser/browser_AttributionCode_Mac_telemetry.js#217-221). We should find a way to replace that, as part of the effort to drop OS.File.
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`OS.File.macSetXAttr` and `OS.File.macGetXAttr` are used in the [attribution code](https://searchfox.org/mozilla-central/search?q=mac%5BGS%5DetXAttr&path=&case=false®exp=true). We should find a way to replace that, as part of the effort to drop OS.File.