[tbb-bugs] #26962 [Applications/Tor Browser]: implement new features onboarding

[Tor Bug Tracker & Wiki]

#26962: implement new features onboarding
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 Reporter:  mcs                       |          Owner:  tbb-team
     Type:  defect                    |         Status:  assigned
 Priority:  Very High                 |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  TorBrowserTeam201808      |  Actual Points:
Parent ID:  #25695                    |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by mcs):

 The first part of this is done: we added the `Explore` button to the new
 user onboarding Circuit Display panel. We hope to promote this to people
 who update from an older version, but haven't finished that part yet.
 There is one Torbutton patch to add the necessary strings:
 https://gitweb.torproject.org/user/brade/torbutton.git/commit/?h=bug26962-01&id=dca195a191bf897680dde1363d12f7262dd26910

 And one tor-browser patch:
 https://gitweb.torproject.org/user/brade/tor-
 browser.git/commit/?h=bug26962-01&id=16e8aa519a3a52de1ea56dff46dc9f669c1e4961

 A few notes:
 * You will also need the fix for #27283, which is the previous commit on
 brade's `bug26962-01` tor-browser branch.
 * Kathy and I re-worded some of the (English) text. We thought the
 messages within the 2nd and 3rd panels were redundant.
 * We used the DuckDuckGo .onion instead of NYT. We need to decide which
 site we want to use. NYT seems to contain trackers and sometimes causes a
 NoScript warning to appear. An https:// site is preferable because it
 would be better not to allow an UITour access from non-SSL sites. We could
 consider using a tpo site (not .onion) so we control it or we could go
 with DDG.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26962#comment:6>
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