[tor-bugs] #19876 [Applications/Tor Browser]: Memory leak: a lot of private strings (New Identity doesn't help)

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#19876: Memory leak: a lot of private strings (New Identity doesn't help)
------------------------------------------+--------------------------------
     Reporter:  bugzilla                  |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-performance-
                                          |  leaking
Actual Points:                            |  Parent ID:  #18047
       Points:                            |   Reviewer:
      Sponsor:                            |
------------------------------------------+--------------------------------
 Add-on eats memory (measured after New Identity):
 {{{
 396.83 MB (100.0%) -- explicit
 ├──338.72 MB (85.36%) -- js-non-window
 │  ├──213.99 MB (53.92%) -- zones
 │  │  ├──201.19 MB (50.70%) -- zone(0x5644a80)
 │  │  │  ├───44.10 MB (11.11%) -- strings
 │  │  │  │   ├──25.50 MB (06.43%) -- (276 tiny)
 │  │  │  │   │  ├───1.32 MB (00.33%) ++ string(length=65, copies=16827,
 "Mozilla/5.0 (Windows NT 6.1; rv:45.0) Gecko/20100101 Firefox/45.0")
 │  │  │  │   │  ├───1.01 MB (00.25%) ── string(length=8, copies=33147,
 "HTTP/1.1")/gc-heap/latin1
 │  │  │  │   │  ├───0.82 MB (00.21%) ++ string(length=4112, copies=207,
 "Bugzilla_login_request_cookie=BFcSJVoFrY; github_secret=BfpXCUcCE5t1S3Z9;
 LASTORDER=bug_status%2Cpriority%2Cassigned_to%2Cbug_id;" (truncated))
 │  │  │  │   │  ├───0.75 MB (00.19%) ── string(length=15, copies=24533,
 "Accept-Encoding")/gc-heap/latin1
 │  │  │  │   │  ├───0.72 MB (00.18%) ++ string(length=37, copies=14052,
 "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256")
 │  │  │  │   │  ├───0.71 MB (00.18%) ── string(length=10, copies=23350,
 "Connection")/gc-heap/latin1
 │  │  │  │   │  ├───0.67 MB (00.17%) ++ string(length=84, copies=6938,
 "trac_form_token=fd9d72f5b4cd93e1480c148c;
 trac_auth=5600191927c0d02b1262131d6ee91acd")
 │  │  │  │   │  ├───0.41 MB (00.10%) ++ string(length=25, copies=10285,
 "Strict-Transport-Security")
 │  │  │  │   │  ├───0.37 MB (00.09%) ++ string(length=19, copies=16351,
 "trac.torproject.org")/gc-heap
 │  │  │  │   │  ├───0.28 MB (00.07%) ++ string(length=595, copies=486,
 "yandex_login=bugzilla; stngs=colorful::on:")
 And many many others...
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19876>
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