I've been using Ghostery for about 4 years now, really useful to not get flooded by ads.
My father recommended me this to get rid of trackers, wasn't sure about how useful it was to install that kind of extension. Right now I don't feel comfy going on Firefox without my ghostery active.
Really love the feature that refuses cookies on every single page. Prevents me to find the little "continue without accepting", that annoying windows just goes off and you're free to navigate on their website without sending your datas.
Couldn't recommend this extension more ! A big thanks for the team :)