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”).
But it is under GNU general public licence. Me too doubt it a spyware or not as the source code is not found anywhere.
(Am not promoting or supporting this addon in anyway).