[tor-bugs] #20799 [Applications/Tor Browser Sandbox]: tor browser sandbox can't open downloads folder

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#20799: tor browser sandbox can't open downloads folder
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     Reporter:  femm                              |      Owner:
         Type:  defect                            |     Status:  new
     Priority:  Medium                            |  Milestone:
    Component:  Applications/Tor Browser Sandbox  |    Version:
     Severity:  Normal                            |   Keywords:
Actual Points:                                    |  Parent ID:
       Points:                                    |   Reviewer:
      Sponsor:                                    |
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 I'm on Ubuntu 16.04 amd64 and clicking the folder icon in about:downloads
 does nothing, neither does clicking "Open Containing Folder".

 the relevant lines in the console seem to be:
 firefox: Failed to open connection to session bus: /usr/bin/dbus-launch
 terminated abnormally without any error message
 firefox: * * (firefox:3): WARNING * *: Cannot launch default application:
 No application is registered as handling this file

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20799>
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