tl;dr - Firefox has some telemtry installed by default, including to GA. They have a deal with Google that allegedly prevents Google from seeing the data being collected.
Even so, their products don't do tracking the way Chrome does (which sends a unique identifier per device [0], which can be identified with the user and tracks you on all sites, and which does even more stuff when a site has GA).
I think comparing the two is ridiculous, and is more an excuse to justify using spyware as your daily driver.
[0] There is a unique ID on install, which is allegedly deleted by the browser, but may be stored in the updater. There is a "semi unique" ID set in its place which has high enough entropy (together with the location etc) to be a used as a unique ID. Aside for lots of other phoning home, logging you in to Google, etc.
tl;dr - Firefox has some telemtry installed by default, including to GA. They have a deal with Google that allegedly prevents Google from seeing the data being collected.
Even so, their products don't do tracking the way Chrome does (which sends a unique identifier per device [0], which can be identified with the user and tracks you on all sites, and which does even more stuff when a site has GA).
I think comparing the two is ridiculous, and is more an excuse to justify using spyware as your daily driver.
[0] There is a unique ID on install, which is allegedly deleted by the browser, but may be stored in the updater. There is a "semi unique" ID set in its place which has high enough entropy (together with the location etc) to be a used as a unique ID. Aside for lots of other phoning home, logging you in to Google, etc.