As explained on https://labs.riseup.net/code/issues/8328#note-5, it's
been broken for 16 months, it is still broken after the partial fix that
went in Tails 1.6, and the logic on which the detector is based cannot
work anymore. Reintroducing and porting this feature is now tracked
on #10560.

Closes: #8328
Refs: #10560