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”).
Users and ratings can be bought, so reputation is important.
Even if a piece of software is open source (which this supposedly is), it needs to be well known enough so that professionals are checking the code for vulnerabilities/ bad behaviour.
https://addons.mozilla.org/en-US/android/addon/ublock-origin/
Ublock Origin has 7 times the number of users anyways?