[](https://www.youtube.com/watch?v=DvjxUN5ZYvE "How to setup system-wide Mullvad DNS over HTTPS on iOS and macOS")
> Heads-up: some apps bypass system-wide Mullvad DNS over HTTPS, see [https://github.com/paulmillr/encrypted-dns](https://github.com/paulmillr/encrypted-dns).
> Heads-up: when using [Little Snitch](https://www.obdev.at/products/littlesnitch/index.html) or [Lulu](https://objective-see.org/products/lulu.html), system-wide Mullvad DNS over HTTPS is disabled given a single network filter can be enabled at a time (restriction imposed by iOS/macOS).
> Heads-up: given above, one should [configure](../how-to-configure-firefox-for-privacy-and-security) Firefox to use DNS over HTTPS as a failsafe.
> Heads-up: for sensitive use cases, use [Tor](https://www.torproject.org/).