But I'm not certain that this is the case. https://disconnect.me/trackerprotection claims to link to lists that show which trackers are only identified and which are identified and blocked, but those links just go to https://github.com/disconnectme/disconnect-tracking-protecti..., where I do not see such a distinction being made.
google-analytics.com is on https://disconnect.me/trackerprotection/blocked and also https://github.com/disconnectme/disconnect-tracking-protecti...
Its certainly low, but I also think FF usage is under reported due to built-in tracker blocking. For reference, FF uses the level 1 disconnect.me block list, which blocks StatCounter scrips from loading on 3rd party sites [1].
[1] https://github.com/disconnectme/disconnect-tracking-protecti...
(Safari, as far as I can tell, tries to avoid having site-specific policies, so maybe the question is "What is Repixel doing that is exploiting a security bug in Safari, and how can Safari fix it?")
The list [1], which includes many APIs, also breaks hundreds of websites [2] that access those APIs
[1] https://github.com/disconnectme/disconnect-tracking-protecti...
The full list of trackers that will be blocked by default is substantial. [2]
1 https://blog.mozilla.org/futurereleases/2019/02/20/enhanced-...
2 https://github.com/disconnectme/disconnect-tracking-protecti...