macOS internal dot-prefixed system fonts are web-measurable (never on a real Mac)
br.font_mac_internal · convicts
browserlayer
artifactcategory
1evaders caught
What it catches
Camoufox source fonts.json: 49 dot-prefixed mac fonts bundled; real browsers hide them
Signals it reads
browser.font_mac_internal
How it fires
present
Evaders it caught 1
Bypassed by 10
Frontier evaders that reach the detector uncaught (scored only suspicious, defeating every convicting tell) — this check is not one that stops them. The red-team frontier this detection still has to convict.