[Suggestion] Change color for custom change state

[happysurf]

In my opinion will be great change the color (like red) for any custom modification string state.
For example I have set the Privacy (compatible) setting but then I have changed the network.dns.disablePrefetch from true to false (Off).
The user after a while may forget what he did, for that will be very useful with a different color highlight any changes.
Thanks.