Much, much more likely to be something from https://hg.mozilla.org/mozilla-central/pushloghtml?changeset=0fb1ccb2974191c256a9baaa9beb710d3147bc64, like bug 1719437.
Bug 1736369 Comment 2 Edit History
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Much, much more likely to be something from https://hg.mozilla.org/mozilla-central/pushloghtml?changeset=0fb1ccb2974191c256a9baaa9beb710d3147bc64, like bug 1719437. (I have no idea if that is the right bug, but it seemed like the best guess to me.)