A unknown addon in firefox addon store with 4.5+ rating.
(From, most of the comments it’s seems like this addon is suspicious and don’t have enough proof or evidence to trust it with our data. So please everyone avoid using this addon. A better one is “UBLOCK ORIGIN”).
I use both cos it’s easier to use on multiple devices and it’s system-wide. So you only have to set it up in the router and you should be fine, if you are outside the home network you can always use private DNS option in android.