Server version: Spigot 1.9 (git-Spigot-1a196e1-09b4549) yyyy-mm-dd 2016-03-08
Preciousstones version: Build #568

Players who are not allowed in a city protection can still extinguish fires inside the city protection, for example in a fireplace :/ I put the relevant part of config.yml and permissions the player has here:
https://gist.github.com/spetznack/b181ca33c8ffa2d1261c

By the way, I've been trying to break preciousstones build #568 on my 1.9 test server - so far it's holding up pretty good 👍