[tor-bugs] #21396 [Applications/Tor Browser]: Torbutton breaks Session Manager addon

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#21396: Torbutton breaks Session Manager addon
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 Reporter:  HolD                      |          Owner:  tbb-team
     Type:  defect                    |         Status:  needs_information
 Priority:  Medium                    |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Normal                    |     Resolution:
 Keywords:  tbb-6.5-regression        |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by HolD):

 6.5a1 - no issue, 6.5a2 - has issue.
 Steps to reproduce: 1) install Tor Browser, 2) install addon
 https://addons.mozilla.org/en-US/firefox/addon/session-manager/, 3)
 confirm information popup about private browsing mode, 4) Session Manager
 button should immediately appear on toolbar (no restart or changing
 preferences is required).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21396#comment:3>
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