The linked webcompat issue has been fixed. The issue in the testcase is no longer reproducible either. ' mozregression range: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=7c83f04c82e9ef6c1d2823a64aedd34a79a90eb9&tochange=737aba43bfa1685fa15a9b542636b959397603a8 Looks like bug 1623124 might have fixed this.
Bug 1541964 Comment 11 Edit History
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The linked webcompat issue has been fixed. The issue in the testcase is no longer reproducible either. mozregression range: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=7c83f04c82e9ef6c1d2823a64aedd34a79a90eb9&tochange=737aba43bfa1685fa15a9b542636b959397603a8 Looks like bug 1623124 might have fixed this.