[tbb-bugs] #19262 [Applications/Tor Browser]: Clicking inside Tor Browser search box or opening its drop-down causes network activity

[Tor Bug Tracker & Wiki]

#19262: Clicking inside Tor Browser search box or opening its drop-down causes
network activity
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 Reporter:  cypherpunks                          |          Owner:  tbb-
     Type:  defect                               |  team
 Priority:  Medium                               |         Status:  new
Component:  Applications/Tor Browser             |      Milestone:
 Severity:  Minor                                |        Version:
 Keywords:  fingerprinting, privacy, tracking,   |     Resolution:
  search                                         |  Actual Points:
Parent ID:  #5816                                |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by cypherpunks):

 The network traffic you see is most likely a favicon request. Firefox
 likes to redownload them constantly and all kinds of UI interactions can
 trigger this. The socks isolation username I have seen for those requests
 is "--NoFirstPartyHost-chrome-browser.xul--".

 No cookies or referrers are sent with those requests, so for popular
 domains there is likely no issue. For unique domains, it may allow some
 tracking of your online status.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19262#comment:1>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online