In bug 1699514 comment 27 we have someone reporting a way to reproduce the problem in Firefox.
Bug 1737489 Comment 24 Edit History
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In bug 1699514 comment 27 we have someone reporting a way to reproduce the problem in Firefox. Bug 1712980.
In bug 1699514 comment 27 we have someone reporting a way to reproduce the problem in Firefox. (Bug 1712980.)