I have been using Ghostery with Firefox for a few years and like it. It keeps tracking cookies out of my system.
The only problem is that Ghostery can disable some features of some web sites that use the trackers that Ghostery blocks. Generally the site works but a feature might not. As I recall, on one site, when I click to check the inventory in the store, it doesn't work until I go into Ghostery to enable that tracker. It isn't hard to do but some sites have more than 5 blocked trackers so it takes a few minutes to find the correct tracker to enable to check the inventory.
I don't run into this as often as I used to, perhaps the site coders are finding better ways to code without using trackers.
Good luck with it,
Jim