Bug 1837051 Comment 8 Edit History

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Hi Mike! Hopefully last poke on my end, but wondering if you might have any ideas why a test checking for the `PANEL-LIST` seems to fail consistently only on linux? 

```
  let [panelList] = win.document.querySelector("migration-wizard").children;
  Assert.equal(panelList.tagName, "PANEL-LIST");
```

[failure](https://treeherder.mozilla.org/logviewer?job_id=420334692&repo=try&lineNumber=2980)
[full log](https://treeherder.mozilla.org/jobs?repo=try&resultStatus=testfailed%2Cbusted%2Cexception%2Cusercancel%2Crunning%2Cpending%2Crunnable&author=nsauermann%40mozilla.com&selectedTaskRun=XWLO7AioQkKq_9Pps05rbw.0)
Hi Mike! Hopefully last poke on my end, but wondering if you might have any ideas why a test checking for the `PANEL-LIST` seems to fail consistently only on linux? Anything I might be missing specifically for Linux OS? 

```
  let [panelList] = win.document.querySelector("migration-wizard").children;
  Assert.equal(panelList.tagName, "PANEL-LIST");
```

[failure](https://treeherder.mozilla.org/logviewer?job_id=420334692&repo=try&lineNumber=2980)
[full log](https://treeherder.mozilla.org/jobs?repo=try&resultStatus=testfailed%2Cbusted%2Cexception%2Cusercancel%2Crunning%2Cpending%2Crunnable&author=nsauermann%40mozilla.com&selectedTaskRun=XWLO7AioQkKq_9Pps05rbw.0)

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