[tor-bugs] #20339 [- Select a component]: tor-browser mozilla_user0 directory often appear in /tmp

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#20339: tor-browser mozilla_user0 directory often appear in /tmp
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     Reporter:  anon                  |      Owner:
         Type:  defect                |     Status:  new
     Priority:  High                  |  Milestone:
    Component:  - Select a component  |    Version:
     Severity:  Major                 |   Keywords:
Actual Points:                        |  Parent ID:
       Points:                        |   Reviewer:
      Sponsor:                        |
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 tor-browser-linux64-6.0.5_en-US

 sometimes a this directory appear: /tmp/mozilla_user0
 Modification time is updated every now and then.
 I think is used to store temporary data ( user data ? ).

 That doesn't happen often.
 For example it happen sometimes watching youtube ( maybe some
 advertisement or script ?) and when a download is finished to save to disk
 in mega, the site.

 This happen when I run Tor Browser.
 It happen every now and then, frequently.
 My privacy settings are at default ( low ).
 If I delete that directory, sometimes it is recreated.
 If I close Tor-Browser, the directory stay there.

 Which conditions let the directory mozilla_user0 appear in /tmp ?
 What about linux x86 (32bit), Windows and macOS versions ?
 That could be privacy related or worse?

 Happy to contribute

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20339>
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