Chromium Sec-CH-UA brand list omits the GREASE brand (hardcoded header)
net.ch_ua_no_grease_brand · convicts
networklayer
artifactcategory
1evaders caught
What it catches
Sec-CH-UA GREASE (anti-ossification); every real Chromium emits a 'Not...Brand' entry
Signals it reads
network.ch_ua_no_grease_brand
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.