I backed this out per [Valentin's request](https://bugzilla.mozilla.org/show_bug.cgi?id=1555966#c3) to fix the regressions it caused.
Bug 1551601 Comment 8 Edit History
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I backed this out in bug 1555966 per [Valentin's request](https://bugzilla.mozilla.org/show_bug.cgi?id=1555966#c3) to fix the regressions it caused.