[tssva]

Once Firefox starts to ignore DNS resolvers configured at the OS level other apps are sure to look at it and think it must be a good idea because Firefox is doing it. Soon there will be a multitude of applications needing this disabled in their own unique way.

If the Mozilla Foundation see this as an issue they should instead be developing a separate solution to provide this system wide. If you must bundle it with Firefox and offer to install it at browser installation or upgrade time. Don't install it by default and certainly don't enable it without user permission.