[tor-bugs] #8400 [TorBrowserButton]: Torbutton's browsing history pref seems to require restart

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#8400: Torbutton's browsing history pref seems to require restart
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     Reporter:           |      Owner:  mikeperry
  mikeperry              |     Status:  new
         Type:  defect   |  Milestone:
     Priority:  major    |    Version:
    Component:           |   Keywords:  tbb-rebase-regression, tbb-
  TorBrowserButton       |  usability
   Resolution:           |  Parent ID:
Actual Points:           |
       Points:           |
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Comment (by mcs):

 Kathy Brade and I did a little research on this bug.  In Firefox 20 and
 newer, a prompt that reads "You must restart Firefox to enable this
 feature" is displayed when someone tries to toggle the
 browser.privatebrowsing.autostart pref. via the Options window.  It seems
 like the Torbutton pref. UI should also prompt to restart.  Existing
 browser windows will need to be closed to switch to private browsing mode
 anyway, and it is probably rare for users to toggle this pref.  There is
 more cost to a restart with TBB of course due to the need to reestablish a
 Tor connection.

 Should we add such a prompt (and associated restart logic)?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8400#comment:3>
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