I think that there were no tests that had a json file. We started re-recording after this patch landed. Here's an example from treeherder: https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=253865308&repo=mozilla-central&lineNumber=631
Bug 1558764 Comment 10 Edit History
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I think that there were no tests that had a json file, except the one for Netflix I guess. We started re-recording after this patch landed. Here's an example from treeherder: https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=253865308&repo=mozilla-central&lineNumber=631