"Prevent access to about:addons at times when these sites are blocked" doesn't work when the sites are empty

[gepz]

Meanwhile
Prevent access to options for this block set at times when these sites are blocked
and
Prevent access to General options at times when these sites are blocked
do work.
This is just a bug in an edge case

[proginosko]

Ha! Good catch. Workaround would be to put a dummy site in the list. 🙂

[Myvh]

There is the same bug with the about:support variant.