Shavar is the server from which Firefox downloads update to its Safe Browsing and Tracking Protection site lists. “Shavar” is the name of the differential update protocol Google designed and uses for Chrome Safe Browsing site list.
aus5 is the server from which Firefox downloads new Firefox updates. “aus” stands for Auto Update Service.
I’m not exactly what data is downloaded from firefox.settings.services.mozilla.com.
Settings one is interesting, it does appear that you cannot block it[0] and that is sad.
The other two appear to be safe browsing and automatic update related. Those two services can be disabled form the regular settings UI, I think? Have you found that to not work?
aus5 is the server from which Firefox downloads new Firefox updates. “aus” stands for Auto Update Service.
I’m not exactly what data is downloaded from firefox.settings.services.mozilla.com.