Clicking inside Tor Browser search box or opening its drop-down causes network activity
I have recently noticed that even the simple "offline" activities in TB mentioned above initiate some kind of network traffic. I unfortunately do not know how to see the specific contents of this traffic, but it is definitively there as I have viewed it from the activity of the FoxyProxy Add-On which I am using for a unique use-case. Regardless of the Add-On being outside TBB's scope, I believe that this is an issue that affects all Tor Browser users.
Leaking traffic like this assists with fingerprinting users and improves correlation/timing-style attacks. It is also possible that some kind of tracking cookie or other information is exchanged in this traffic, see #5816 (moved).
It would be good to know what is in this traffic, and furthermore, to disable this activity from a simple "offline" focus of the search box. Thank you.