A possible answer to Rosa1606 Rated 5 out of 5 stars

Ghostery displays blocked items even if they were already blocked by another application, whilst DNT+ displays only what it has itself blocked (no redundancy).
I have a security/privacy background which blocks I guess practically every nasty matter, and when I tested GhostScript it mentioned having blocked what was already blocked, and when I tested DNT+ it mentioned only what it had blocked itself : still a few :)
This could be an explanation, considering Rosa1606 already has items blocked by other means (HOSTS file, AdBlock+, or others?)

This review is for a previous version of the add-on (2.1.0.327).  This user has a previous review of this add-on.