Please don't ask why this works, but it does. It's the code we have in the ESR, see https://hg.mozilla.org/releases/comm-esr60/rev/dd1713342fe3f723edb6da6ac8de2ed3c36d13a1
Bug 1539295 Comment 4 Edit History
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Please don't ask why this works, but it does. It's the code we have in the ESR, see https://hg.mozilla.org/releases/comm=esr60/rev/dd1713342fe3f723edb6da6ac8de2ed3c36d13a1 EDIT: Destroying the link so my "this needs uplift filter" works.