Jun 8 2018
In my case I selected "Set a local exception for this global preference" and the box became clickable; then I made one change ad I saved. But when I reloaded the page "Set a local exception for this global preference" was still selected, but the change I made had disappeared. I tried many times, but every time I made the change and then it disappeared.
Dec 9 2017
Aug 3 2016
It's impossible to add or modify statements with "item" datatype.