Bug: Intermittent browser/components/sessionstore/test/browser_windowStateContainer.js | Uncaught exception - at /browser/components/sessionstore/test/browser_windowStateContainer.js:83 - TypeError: can't access property "document", content is null
Status: RESOLVED
Priority: P5
Resolution: INCOMPLETE
Created: 2020-11-13 19:52:29+00:00
Resolved: 2021-06-01 17:01:12+00:00

**Filed by:** malexandru [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=321725015&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/VZ3GAaFUQ1umYcANUg0Lfg/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2020-11-13T17:51:15.721Z] 17:51:15     INFO - TEST-START | browser/components/sessionstore/test/browser_windowStateContainer.js
[task 2020-11-13T17:51:15.766Z] 17:51:15     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 000001508121A000 == 24 [pid = 1512] [id = 430]
[task 2020-11-13T17:51:15.766Z] 17:51:15     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 59 (00000150837CB040) [pid = 1512] [serial = 1038] [outer = 0000000000000000]
[task 2020-11-13T17:51:15.766Z] 17:51:15     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 60 (0000015081763C00) [pid = 1512] [serial = 1039] [outer = 00000150837CB040]
[task 2020-11-13T17:51:15.766Z] 17:51:15     INFO - GECKO(7740) | 1605289875765	Marionette	TRACE	Received observer notification toplevel-window-ready
[task 2020-11-13T17:51:15.776Z] 17:51:15     INFO - GECKO(7740) | [Parent 1512, Main Thread] WARNING: NS_ENSURE_TRUE(rootFrame) failed: file /builds/worker/checkouts/gecko/dom/base/nsGlobalWindowOuter.cpp:4289
[task 2020-11-13T17:51:15.919Z] 17:51:15     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 13 (00000225A676E800) [pid = 5872] [serial = 448] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:15.919Z] 17:51:15     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 000002259E598000 == 1 [pid = 5872] [id = 176] [url = about:blank]
[task 2020-11-13T17:51:15.919Z] 17:51:15     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 12 (00000225A4A83800) [pid = 5872] [serial = 450] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:15.919Z] 17:51:15     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 11 (00000225A6778000) [pid = 5872] [serial = 458] [outer = 0000000000000000] [url = http://www.example.com/]
[task 2020-11-13T17:51:15.919Z] 17:51:15     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 10 (00000225A4A8E800) [pid = 5872] [serial = 452] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:15.919Z] 17:51:15     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 9 (00000225A6773000) [pid = 5872] [serial = 455] [outer = 0000000000000000] [url = http://www.example.com/]
[task 2020-11-13T17:51:15.920Z] 17:51:15     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 8 (000002259E5A3C00) [pid = 5872] [serial = 462] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:15.920Z] 17:51:15     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 000002259E5A7400 == 0 [pid = 5872] [id = 175] [url = about:blank]
[task 2020-11-13T17:51:15.959Z] 17:51:15     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 0000015085BF6C00 == 25 [pid = 1512] [id = 431]
[task 2020-11-13T17:51:15.959Z] 17:51:15     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 61 (00000150837CB200) [pid = 1512] [serial = 1040] [outer = 0000000000000000]
[task 2020-11-13T17:51:15.959Z] 17:51:15     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 7 (00000225A7672200) [pid = 5872] [serial = 459] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:15.959Z] 17:51:15     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 6 (00000225A4AC9580) [pid = 5872] [serial = 461] [outer = 0000000000000000] [url = http://example.org/#1]
[task 2020-11-13T17:51:15.999Z] 17:51:15     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 000002259E592400 == 1 [pid = 5872] [id = 177]
[task 2020-11-13T17:51:15.999Z] 17:51:15     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 7 (00000225A4AC9580) [pid = 5872] [serial = 468] [outer = 0000000000000000]
[task 2020-11-13T17:51:15.999Z] 17:51:15     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 8 (000002259E5A0800) [pid = 5872] [serial = 469] [outer = 00000225A4AC9580]
[task 2020-11-13T17:51:16.065Z] 17:51:16     INFO - GECKO(7740) | [Parent 1512, Main Thread] WARNING: NS_ENSURE_TRUE(presShell) failed: file /builds/worker/checkouts/gecko/dom/base/nsGlobalWindowOuter.cpp:4287
[task 2020-11-13T17:51:16.084Z] 17:51:16     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 62 (00000150818B7000) [pid = 1512] [serial = 1041] [outer = 00000150837CB200]
[task 2020-11-13T17:51:16.205Z] 17:51:16     INFO - GECKO(7740) | [Parent 1512, Main Thread] WARNING: NS_ENSURE_TRUE(mPresShell) failed: file /builds/worker/checkouts/gecko/layout/generic/nsFrameSelection.cpp:1603
[task 2020-11-13T17:51:16.265Z] 17:51:16     INFO - GECKO(7740) | [Child 4996: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 000001CD995B0400 == 1 [pid = 4996] [id = 8] [url = about:blank]
[task 2020-11-13T17:51:16.265Z] 17:51:16     INFO - GECKO(7740) | [Child 4996: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 000001CD9F6AC800 == 0 [pid = 4996] [id = 7] [url = data:text/html,<html><body>A%20regular,%20everyday,%20normal%20page.]
[task 2020-11-13T17:51:16.317Z] 17:51:16     INFO - GECKO(7740) | [Child 4996: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 6 (000001CD9F6E0580) [pid = 4996] [serial = 15] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:16.317Z] 17:51:16     INFO - GECKO(7740) | [Child 4996: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 5 (000001CD9F6E0740) [pid = 4996] [serial = 17] [outer = 0000000000000000] [url = data:text/html,<html><body>A%20regular,%20everyday,%20normal%20page.]
[task 2020-11-13T17:51:16.327Z] 17:51:16     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 9 (00000225A4F75400) [pid = 5872] [serial = 470] [outer = 00000225A4AC9580]
[task 2020-11-13T17:51:16.357Z] 17:51:16     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000225A4F76000 == 2 [pid = 5872] [id = 178]
[task 2020-11-13T17:51:16.357Z] 17:51:16     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 10 (00000225A4AC9AC0) [pid = 5872] [serial = 471] [outer = 0000000000000000]
[task 2020-11-13T17:51:16.357Z] 17:51:16     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 11 (00000225A4F77C00) [pid = 5872] [serial = 472] [outer = 00000225A4AC9AC0]
[task 2020-11-13T17:51:16.396Z] 17:51:16     INFO - GECKO(7740) | [Child 1556: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000222EE0B0000 == 2 [pid = 1556] [id = 40]
[task 2020-11-13T17:51:16.396Z] 17:51:16     INFO - GECKO(7740) | [Child 1556: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 3 (00000222F41E0900) [pid = 1556] [serial = 111] [outer = 0000000000000000]
[task 2020-11-13T17:51:16.396Z] 17:51:16     INFO - GECKO(7740) | [Child 1556: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 4 (00000222F41BB800) [pid = 1556] [serial = 112] [outer = 00000222F41E0900]
[task 2020-11-13T17:51:16.475Z] 17:51:16     INFO - GECKO(7740) | [Child 1556: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 5 (00000222F681D000) [pid = 1556] [serial = 113] [outer = 00000222F41E0900]
[task 2020-11-13T17:51:16.497Z] 17:51:16     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 12 (00000225A676E800) [pid = 5872] [serial = 473] [outer = 00000225A4AC9AC0]
[task 2020-11-13T17:51:16.860Z] 17:51:16     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000225A6772400 == 3 [pid = 5872] [id = 179]
[task 2020-11-13T17:51:16.860Z] 17:51:16     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 13 (00000225A7672040) [pid = 5872] [serial = 474] [outer = 0000000000000000]
[task 2020-11-13T17:51:16.860Z] 17:51:16     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 14 (00000225A6773800) [pid = 5872] [serial = 475] [outer = 00000225A7672040]
[task 2020-11-13T17:51:17.043Z] 17:51:17     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 15 (00000225A6777400) [pid = 5872] [serial = 476] [outer = 00000225A7672040]
[task 2020-11-13T17:51:17.152Z] 17:51:17     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000225A6778400 == 4 [pid = 5872] [id = 180]
[task 2020-11-13T17:51:17.152Z] 17:51:17     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 16 (00000225A76723C0) [pid = 5872] [serial = 477] [outer = 0000000000000000]
[task 2020-11-13T17:51:17.152Z] 17:51:17     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 17 (00000225A6779400) [pid = 5872] [serial = 478] [outer = 00000225A76723C0]
[task 2020-11-13T17:51:17.313Z] 17:51:17     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 18 (00000225A677C000) [pid = 5872] [serial = 479] [outer = 00000225A76723C0]
[task 2020-11-13T17:51:17.413Z] 17:51:17     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000225A6774C00 == 5 [pid = 5872] [id = 181]
[task 2020-11-13T17:51:17.413Z] 17:51:17     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 19 (00000225A7672900) [pid = 5872] [serial = 480] [outer = 0000000000000000]
[task 2020-11-13T17:51:17.413Z] 17:51:17     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 20 (00000225A677C800) [pid = 5872] [serial = 481] [outer = 00000225A7672900]
[task 2020-11-13T17:51:17.596Z] 17:51:17     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 21 (00000225A761FC00) [pid = 5872] [serial = 482] [outer = 00000225A7672900]
[task 2020-11-13T17:51:17.715Z] 17:51:17     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 0000015082C68000 == 26 [pid = 1512] [id = 432]
[task 2020-11-13T17:51:17.715Z] 17:51:17     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 63 (000001507E337040) [pid = 1512] [serial = 1042] [outer = 0000000000000000]
[task 2020-11-13T17:51:17.715Z] 17:51:17     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 64 (0000015082C67400) [pid = 1512] [serial = 1043] [outer = 000001507E337040]
[task 2020-11-13T17:51:17.725Z] 17:51:17     INFO - GECKO(7740) | 1605289877722	Marionette	TRACE	Received observer notification toplevel-window-ready
[task 2020-11-13T17:51:17.764Z] 17:51:17     INFO - GECKO(7740) | [Parent 1512, Main Thread] WARNING: NS_ENSURE_TRUE(rootFrame) failed: file /builds/worker/checkouts/gecko/dom/base/nsGlobalWindowOuter.cpp:4289
[task 2020-11-13T17:51:17.973Z] 17:51:17     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 0000015087E24800 == 27 [pid = 1512] [id = 433]
[task 2020-11-13T17:51:17.973Z] 17:51:17     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 65 (0000015071C25900) [pid = 1512] [serial = 1044] [outer = 0000000000000000]
[task 2020-11-13T17:51:18.024Z] 17:51:18     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000225A677D800 == 6 [pid = 5872] [id = 182]
[task 2020-11-13T17:51:18.024Z] 17:51:18     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 22 (00000225A7672C80) [pid = 5872] [serial = 483] [outer = 0000000000000000]
[task 2020-11-13T17:51:18.024Z] 17:51:18     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 23 (00000225A7621400) [pid = 5872] [serial = 484] [outer = 00000225A7672C80]
[task 2020-11-13T17:51:18.063Z] 17:51:18     INFO - GECKO(7740) | [Child 6916: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 13 (000002B81C975400) [pid = 6916] [serial = 51] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:18.063Z] 17:51:18     INFO - GECKO(7740) | [Child 6916: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 000002B815FA9400 == 3 [pid = 6916] [id = 22] [url = about:blank]
[task 2020-11-13T17:51:18.063Z] 17:51:18     INFO - GECKO(7740) | [Child 6916: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 000002B81C4A7400 == 2 [pid = 6916] [id = 21] [url = data:text/html,<html><body>A%20regular,%20everyday,%20normal%20page.]
[task 2020-11-13T17:51:18.088Z] 17:51:18     INFO - GECKO(7740) | [Child 1924: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 1 (000001CFBE9E1580) [pid = 1924] [serial = 7] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:18.118Z] 17:51:18     INFO - GECKO(7740) | [Parent 1512, Main Thread] WARNING: NS_ENSURE_TRUE(presShell) failed: file /builds/worker/checkouts/gecko/dom/base/nsGlobalWindowOuter.cpp:4287
[task 2020-11-13T17:51:18.118Z] 17:51:18     INFO - GECKO(7740) | [Child 6916: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 12 (000002B81C4CE580) [pid = 6916] [serial = 46] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:18.118Z] 17:51:18     INFO - GECKO(7740) | [Child 6916: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 11 (000002B81C4CE740) [pid = 6916] [serial = 48] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:18.118Z] 17:51:18     INFO - GECKO(7740) | [Child 6916: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 10 (000002B81C4CE900) [pid = 6916] [serial = 50] [outer = 0000000000000000] [url = data:text/html,<html><body>A%20regular,%20everyday,%20normal%20page.]
[task 2020-11-13T17:51:18.144Z] 17:51:18     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 66 (000001508674AC00) [pid = 1512] [serial = 1045] [outer = 0000015071C25900]
[task 2020-11-13T17:51:18.263Z] 17:51:18     INFO - GECKO(7740) | [Parent 1512, Main Thread] WARNING: NS_ENSURE_TRUE(mPresShell) failed: file /builds/worker/checkouts/gecko/layout/generic/nsFrameSelection.cpp:1603
[task 2020-11-13T17:51:18.422Z] 17:51:18     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 24 (00000225A7624800) [pid = 5872] [serial = 485] [outer = 00000225A7672C80]
[task 2020-11-13T17:51:18.461Z] 17:51:18     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000225A7622400 == 7 [pid = 5872] [id = 183]
[task 2020-11-13T17:51:18.461Z] 17:51:18     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 25 (00000225A7B90040) [pid = 5872] [serial = 486] [outer = 0000000000000000]
[task 2020-11-13T17:51:18.461Z] 17:51:18     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 26 (00000225A7629400) [pid = 5872] [serial = 487] [outer = 00000225A7B90040]
[task 2020-11-13T17:51:18.500Z] 17:51:18     INFO - GECKO(7740) | [Child 1556: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000222F6658000 == 3 [pid = 1556] [id = 41]
[task 2020-11-13T17:51:18.500Z] 17:51:18     INFO - GECKO(7740) | [Child 1556: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 6 (00000222F41E0C80) [pid = 1556] [serial = 114] [outer = 0000000000000000]
[task 2020-11-13T17:51:18.500Z] 17:51:18     INFO - GECKO(7740) | [Child 1556: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 7 (00000222F6829400) [pid = 1556] [serial = 115] [outer = 00000222F41E0C80]
[task 2020-11-13T17:51:18.605Z] 17:51:18     INFO - GECKO(7740) | [Child 1556: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 8 (00000222F7D2A400) [pid = 1556] [serial = 116] [outer = 00000222F41E0C80]
[task 2020-11-13T17:51:18.624Z] 17:51:18     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 27 (00000225A762C800) [pid = 5872] [serial = 488] [outer = 00000225A7B90040]
[task 2020-11-13T17:51:18.966Z] 17:51:18     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000225A7627C00 == 8 [pid = 5872] [id = 184]
[task 2020-11-13T17:51:18.966Z] 17:51:18     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 28 (00000225A7B903C0) [pid = 5872] [serial = 489] [outer = 0000000000000000]
[task 2020-11-13T17:51:18.966Z] 17:51:18     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 29 (00000225A789F800) [pid = 5872] [serial = 490] [outer = 00000225A7B903C0]
[task 2020-11-13T17:51:19.146Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 30 (00000225A78A8800) [pid = 5872] [serial = 491] [outer = 00000225A7B903C0]
[task 2020-11-13T17:51:19.327Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000225A78A8C00 == 9 [pid = 5872] [id = 185]
[task 2020-11-13T17:51:19.327Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 31 (00000225A7B90740) [pid = 5872] [serial = 492] [outer = 0000000000000000]
[task 2020-11-13T17:51:19.327Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 32 (00000225A78A9C00) [pid = 5872] [serial = 493] [outer = 00000225A7B90740]
[task 2020-11-13T17:51:19.459Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 33 (00000225A78AC400) [pid = 5872] [serial = 494] [outer = 00000225A7B90740]
[task 2020-11-13T17:51:19.668Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000225A762A400 == 10 [pid = 5872] [id = 186]
[task 2020-11-13T17:51:19.668Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 34 (00000225A7B90580) [pid = 5872] [serial = 495] [outer = 0000000000000000]
[task 2020-11-13T17:51:19.670Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 35 (00000225A78AA800) [pid = 5872] [serial = 496] [outer = 00000225A7B90580]
[task 2020-11-13T17:51:19.693Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000225A78AD400 == 11 [pid = 5872] [id = 187]
[task 2020-11-13T17:51:19.694Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 36 (00000225A7B90200) [pid = 5872] [serial = 497] [outer = 0000000000000000]
[task 2020-11-13T17:51:19.694Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 37 (00000225A78AE800) [pid = 5872] [serial = 498] [outer = 00000225A7B90200]
[task 2020-11-13T17:51:19.715Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000225AA77F800 == 12 [pid = 5872] [id = 188]
[task 2020-11-13T17:51:19.715Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 38 (00000225A7B90900) [pid = 5872] [serial = 499] [outer = 0000000000000000]
[task 2020-11-13T17:51:19.717Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 39 (00000225AA780800) [pid = 5872] [serial = 500] [outer = 00000225A7B90900]
[task 2020-11-13T17:51:19.741Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000225AA781800 == 13 [pid = 5872] [id = 189]
[task 2020-11-13T17:51:19.741Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 40 (00000225A7B90AC0) [pid = 5872] [serial = 501] [outer = 0000000000000000]
[task 2020-11-13T17:51:19.741Z] 17:51:19     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 41 (00000225AA782800) [pid = 5872] [serial = 502] [outer = 00000225A7B90AC0]
[task 2020-11-13T17:51:20.003Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 42 (00000225AA787400) [pid = 5872] [serial = 503] [outer = 00000225A7672C80]
[task 2020-11-13T17:51:20.013Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 43 (00000225AA789000) [pid = 5872] [serial = 504] [outer = 00000225A7B90580]
[task 2020-11-13T17:51:20.023Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 44 (00000225AA78A400) [pid = 5872] [serial = 505] [outer = 00000225A7B90200]
[task 2020-11-13T17:51:20.041Z] 17:51:20     INFO - TEST-INFO | started process screenshot
[task 2020-11-13T17:51:20.121Z] 17:51:20     INFO - TEST-INFO | screenshot: exit 0
[task 2020-11-13T17:51:20.122Z] 17:51:20     INFO - Buffered messages logged at 17:51:15
[task 2020-11-13T17:51:20.122Z] 17:51:20     INFO - Entering test bound setup
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - Leaving test bound setup
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - Entering test bound 
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - Buffered messages logged at 17:51:17
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - TEST-PASS | browser/components/sessionstore/test/browser_windowStateContainer.js | 1st Window: tabs[0].userContextId should exist. - 1 == 1 - 
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - TEST-PASS | browser/components/sessionstore/test/browser_windowStateContainer.js | 1st Window: tabs[1].userContextId should exist. - 2 == 2 - 
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - TEST-PASS | browser/components/sessionstore/test/browser_windowStateContainer.js | 1st Window: tabs[2].userContextId should exist. - 3 == 3 - 
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - TEST-PASS | browser/components/sessionstore/test/browser_windowStateContainer.js | 1st Window: tabs[3].userContextId should exist. - 4 == 4 - 
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - Buffered messages logged at 17:51:19
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - TEST-PASS | browser/components/sessionstore/test/browser_windowStateContainer.js | The docShell has the correct userContextId - 1 == 1 - 
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - TEST-PASS | browser/components/sessionstore/test/browser_windowStateContainer.js | The document has the correct userContextId - 1 == 1 - 
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - TEST-PASS | browser/components/sessionstore/test/browser_windowStateContainer.js | The docShell has the correct userContextId - 2 == 2 - 
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - TEST-PASS | browser/components/sessionstore/test/browser_windowStateContainer.js | The document has the correct userContextId - 2 == 2 - 
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - TEST-PASS | browser/components/sessionstore/test/browser_windowStateContainer.js | The docShell has the correct userContextId - 3 == 3 - 
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - TEST-PASS | browser/components/sessionstore/test/browser_windowStateContainer.js | The document has the correct userContextId - 3 == 3 - 
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - TEST-PASS | browser/components/sessionstore/test/browser_windowStateContainer.js | The docShell has the correct userContextId - 4 == 4 - 
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - TEST-PASS | browser/components/sessionstore/test/browser_windowStateContainer.js | The document has the correct userContextId - 4 == 4 - 
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - Buffered messages logged at 17:51:20
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - TEST-PASS | browser/components/sessionstore/test/browser_windowStateContainer.js | The docShell has the correct userContextId - 0 == 0 - 
[task 2020-11-13T17:51:20.123Z] 17:51:20     INFO - Buffered messages finished
[task 2020-11-13T17:51:20.124Z] 17:51:20     INFO - TEST-UNEXPECTED-FAIL | browser/components/sessionstore/test/browser_windowStateContainer.js | Uncaught exception - at chrome://mochitests/content/browser/browser/components/sessionstore/test/browser_windowStateContainer.js:83 - TypeError: can't access property "document", content is null
[task 2020-11-13T17:51:20.124Z] 17:51:20     INFO - Stack trace:
[task 2020-11-13T17:51:20.124Z] 17:51:20     INFO - @chrome://mochitests/content/browser/browser/components/sessionstore/test/browser_windowStateContainer.js:83:1
[task 2020-11-13T17:51:20.124Z] 17:51:20     INFO - execute@resource://specialpowers/SpecialPowersSandbox.jsm:141:12
[task 2020-11-13T17:51:20.124Z] 17:51:20     INFO - _spawnTask@resource://specialpowers/SpecialPowersChild.jsm:1617:15
[task 2020-11-13T17:51:20.124Z] 17:51:20     INFO - receiveMessage@resource://specialpowers/SpecialPowersChild.jsm:310:21
[task 2020-11-13T17:51:20.124Z] 17:51:20     INFO - Leaving test bound 
[task 2020-11-13T17:51:20.124Z] 17:51:20     INFO - Entering test bound 
[task 2020-11-13T17:51:20.124Z] 17:51:20     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 0000015087F87800 == 28 [pid = 1512] [id = 434]
[task 2020-11-13T17:51:20.124Z] 17:51:20     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 67 (000001507E337740) [pid = 1512] [serial = 1046] [outer = 0000000000000000]
[task 2020-11-13T17:51:20.124Z] 17:51:20     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 68 (00000150880AE000) [pid = 1512] [serial = 1047] [outer = 000001507E337740]
[task 2020-11-13T17:51:20.124Z] 17:51:20     INFO - GECKO(7740) | 1605289880043	Marionette	TRACE	Received observer notification toplevel-window-ready
[task 2020-11-13T17:51:20.124Z] 17:51:20     INFO - GECKO(7740) | [Parent 1512, Main Thread] WARNING: NS_ENSURE_TRUE(rootFrame) failed: file /builds/worker/checkouts/gecko/dom/base/nsGlobalWindowOuter.cpp:4289
[task 2020-11-13T17:51:20.235Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 43 (00000225A6773C00) [pid = 5872] [serial = 460] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:20.235Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 42 (00000225A6770C00) [pid = 5872] [serial = 463] [outer = 0000000000000000] [url = http://example.org/#1]
[task 2020-11-13T17:51:20.253Z] 17:51:20     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 0000015088628000 == 29 [pid = 1512] [id = 435]
[task 2020-11-13T17:51:20.253Z] 17:51:20     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 69 (0000015083F38AC0) [pid = 1512] [serial = 1048] [outer = 0000000000000000]
[task 2020-11-13T17:51:20.253Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 00000225A78A8C00 == 12 [pid = 5872] [id = 185] [url = http://example.com/]
[task 2020-11-13T17:51:20.253Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 00000225A7627C00 == 11 [pid = 5872] [id = 184] [url = http://example.com/]
[task 2020-11-13T17:51:20.253Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 00000225A7622400 == 10 [pid = 5872] [id = 183] [url = http://example.com/]
[task 2020-11-13T17:51:20.318Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000225A4F77000 == 11 [pid = 5872] [id = 190]
[task 2020-11-13T17:51:20.318Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 43 (00000225A7823200) [pid = 5872] [serial = 506] [outer = 0000000000000000]
[task 2020-11-13T17:51:20.318Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 44 (00000225A676E400) [pid = 5872] [serial = 507] [outer = 00000225A7823200]
[task 2020-11-13T17:51:20.358Z] 17:51:20     INFO - GECKO(7740) | [Child 4996: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 4 (000001CD995B3800) [pid = 4996] [serial = 16] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:20.358Z] 17:51:20     INFO - GECKO(7740) | [Child 4996: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 3 (000001CD9FF87400) [pid = 4996] [serial = 19] [outer = 0000000000000000] [url = data:text/html,<html><body>A%20regular,%20everyday,%20normal%20page.]
[task 2020-11-13T17:51:20.358Z] 17:51:20     INFO - GECKO(7740) | [Child 4996: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 2 (000001CD9F6B7C00) [pid = 4996] [serial = 18] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:20.376Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 43 (00000225A4AC9C80) [pid = 5872] [serial = 464] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:20.376Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 42 (00000225A4AC9740) [pid = 5872] [serial = 466] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:20.398Z] 17:51:20     INFO - GECKO(7740) | [Child 4996: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 1 (000001CD9F6E0900) [pid = 4996] [serial = 20] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:20.427Z] 17:51:20     INFO - GECKO(7740) | [Parent 1512, Main Thread] WARNING: NS_ENSURE_TRUE(presShell) failed: file /builds/worker/checkouts/gecko/dom/base/nsGlobalWindowOuter.cpp:4287
[task 2020-11-13T17:51:20.508Z] 17:51:20     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 70 (00000150880AA400) [pid = 1512] [serial = 1049] [outer = 0000015083F38AC0]
[task 2020-11-13T17:51:20.518Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 43 (00000225A6779000) [pid = 5872] [serial = 508] [outer = 00000225A7B90900]
[task 2020-11-13T17:51:20.528Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 44 (00000225A677C400) [pid = 5872] [serial = 509] [outer = 00000225A7B90AC0]
[task 2020-11-13T17:51:20.647Z] 17:51:20     INFO - GECKO(7740) | [Parent 1512, Main Thread] WARNING: NS_ENSURE_TRUE(mPresShell) failed: file /builds/worker/checkouts/gecko/layout/generic/nsFrameSelection.cpp:1603
[task 2020-11-13T17:51:20.921Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 45 (00000225A7623000) [pid = 5872] [serial = 510] [outer = 00000225A7823200]
[task 2020-11-13T17:51:20.942Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000225A7624400 == 12 [pid = 5872] [id = 191]
[task 2020-11-13T17:51:20.942Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 46 (00000225A78233C0) [pid = 5872] [serial = 511] [outer = 0000000000000000]
[task 2020-11-13T17:51:20.942Z] 17:51:20     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 47 (00000225A762AC00) [pid = 5872] [serial = 512] [outer = 00000225A78233C0]
[task 2020-11-13T17:51:20.980Z] 17:51:20     INFO - GECKO(7740) | [Child 1556: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000222F7B0AC00 == 4 [pid = 1556] [id = 42]
[task 2020-11-13T17:51:20.980Z] 17:51:20     INFO - GECKO(7740) | [Child 1556: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 9 (00000222F7DE9040) [pid = 1556] [serial = 117] [outer = 0000000000000000]
[task 2020-11-13T17:51:20.980Z] 17:51:20     INFO - GECKO(7740) | [Child 1556: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 10 (00000222F7DD3000) [pid = 1556] [serial = 118] [outer = 00000222F7DE9040]
[task 2020-11-13T17:51:21.063Z] 17:51:21     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 48 (00000225A78A8400) [pid = 5872] [serial = 513] [outer = 00000225A78233C0]
[task 2020-11-13T17:51:21.624Z] 17:51:21     INFO - TEST-PASS | browser/components/sessionstore/test/browser_windowStateContainer.js | win should have 2 tabs - 2 == 2 - 
[task 2020-11-13T17:51:21.624Z] 17:51:21     INFO - TEST-PASS | browser/components/sessionstore/test/browser_windowStateContainer.js | 1st Window: tabs[0].userContextId should be 0 - 0 == 0 - 
[task 2020-11-13T17:51:21.624Z] 17:51:21     INFO - TEST-PASS | browser/components/sessionstore/test/browser_windowStateContainer.js | 1st Window: tabs[1].userContextId should be 1 - 1 == 1 - 
[task 2020-11-13T17:51:21.624Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 0000015064E3DC00 == 30 [pid = 1512] [id = 436]
[task 2020-11-13T17:51:21.624Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 71 (0000015076BBFAC0) [pid = 1512] [serial = 1050] [outer = 0000000000000000]
[task 2020-11-13T17:51:21.624Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 72 (0000015064E48C00) [pid = 1512] [serial = 1051] [outer = 0000015076BBFAC0]
[task 2020-11-13T17:51:21.634Z] 17:51:21     INFO - GECKO(7740) | 1605289881627	Marionette	TRACE	Received observer notification toplevel-window-ready
[task 2020-11-13T17:51:21.634Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512, Main Thread] WARNING: NS_ENSURE_TRUE(rootFrame) failed: file /builds/worker/checkouts/gecko/dom/base/nsGlobalWindowOuter.cpp:4289
[task 2020-11-13T17:51:21.797Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 0000015089E69400 == 31 [pid = 1512] [id = 437]
[task 2020-11-13T17:51:21.797Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 73 (000001507BFB2740) [pid = 1512] [serial = 1052] [outer = 0000000000000000]
[task 2020-11-13T17:51:21.847Z] 17:51:21     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000225A78A8C00 == 13 [pid = 5872] [id = 192]
[task 2020-11-13T17:51:21.847Z] 17:51:21     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 49 (00000225A7823740) [pid = 5872] [serial = 514] [outer = 0000000000000000]
[task 2020-11-13T17:51:21.847Z] 17:51:21     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 50 (00000225A78AB000) [pid = 5872] [serial = 515] [outer = 00000225A7823740]
[task 2020-11-13T17:51:21.928Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512, Main Thread] WARNING: NS_ENSURE_TRUE(presShell) failed: file /builds/worker/checkouts/gecko/dom/base/nsGlobalWindowOuter.cpp:4287
[task 2020-11-13T17:51:21.930Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 72 (0000015082C69800) [pid = 1512] [serial = 1012] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:21.930Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 71 (0000015081760400) [pid = 1512] [serial = 1004] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:21.930Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 70 (000001507BD1B800) [pid = 1512] [serial = 1007] [outer = 0000000000000000] [url = about:mozilla]
[task 2020-11-13T17:51:21.930Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 69 (00000150819D7800) [pid = 1512] [serial = 998] [outer = 0000000000000000] [url = about:buildconfig]
[task 2020-11-13T17:51:21.931Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 68 (0000015085A8DC00) [pid = 1512] [serial = 1016] [outer = 0000000000000000] [url = about:mozilla]
[task 2020-11-13T17:51:21.931Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 67 (000001507EDC9000) [pid = 1512] [serial = 1025] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:21.931Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 66 (0000015083BCE400) [pid = 1512] [serial = 1015] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:21.931Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 65 (0000015082C5A400) [pid = 1512] [serial = 1026] [outer = 0000000000000000] [url = about:robots]
[task 2020-11-13T17:51:21.931Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 64 (0000015086749C00) [pid = 1512] [serial = 1023] [outer = 0000000000000000] [url = about:robots]
[task 2020-11-13T17:51:21.932Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 63 (000001508674E400) [pid = 1512] [serial = 1022] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:21.934Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 62 (000001507CE80400) [pid = 1512] [serial = 1013] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:21.952Z] 17:51:21     INFO - GECKO(7740) | [Parent 1512: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 63 (0000015071ED8000) [pid = 1512] [serial = 1053] [outer = 000001507BFB2740]
[task 2020-11-13T17:51:22.072Z] 17:51:22     INFO - GECKO(7740) | [Parent 1512, Main Thread] WARNING: NS_ENSURE_TRUE(mPresShell) failed: file /builds/worker/checkouts/gecko/layout/generic/nsFrameSelection.cpp:1603
[task 2020-11-13T17:51:22.131Z] 17:51:22     INFO - GECKO(7740) | [Child 1924: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 0 (000001CFBE9B2400) [pid = 1924] [serial = 8] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:22.160Z] 17:51:22     INFO - GECKO(7740) | [Child 6916: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 9 (000002B81C978000) [pid = 6916] [serial = 56] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:22.160Z] 17:51:22     INFO - GECKO(7740) | [Child 6916: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 8 (000002B81C4A2800) [pid = 6916] [serial = 49] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:22.160Z] 17:51:22     INFO - GECKO(7740) | [Child 6916: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 7 (000002B81EF7C800) [pid = 6916] [serial = 52] [outer = 0000000000000000] [url = data:text/html,<html><body>A%20regular,%20everyday,%20normal%20page.]
[task 2020-11-13T17:51:22.160Z] 17:51:22     INFO - GECKO(7740) | [Child 6916: Main Thread]: I/DocShellAndDOMWindowLeak --DOMWINDOW == 6 (000002B815FB0C00) [pid = 6916] [serial = 47] [outer = 0000000000000000] [url = about:blank]
[task 2020-11-13T17:51:22.191Z] 17:51:22     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 51 (00000225AA781400) [pid = 5872] [serial = 516] [outer = 00000225A7823740]
[task 2020-11-13T17:51:22.209Z] 17:51:22     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOCSHELL 00000225AA783400 == 14 [pid = 5872] [id = 193]
[task 2020-11-13T17:51:22.209Z] 17:51:22     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 52 (00000225A7823AC0) [pid = 5872] [serial = 517] [outer = 0000000000000000]
[task 2020-11-13T17:51:22.209Z] 17:51:22     INFO - GECKO(7740) | [Child 5872: Main Thread]: I/DocShellAndDOMWindowLeak ++DOMWINDOW == 53 (00000225AA788000) [pid = 5872] [serial = 518] [outer = 00000225A7823AC0]```