Reproduced the initial crash on Firefox 74 beta 9 and on Nightly 76.0a1 (Build ID: 20200320095353) on Mac OS X 10.15. Verified as fixed using Firefox 75 beta 10 and the latest Nightly 76.0a1 on Mac OS X 10.15 (no crash occurs when following the steps from Comment 5).
Bug 1622731 Comment 14 Edit History
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Reproduced the initial crash on Firefox 75 beta 9 and on Nightly 76.0a1 (Build ID: 20200320095353) on Mac OS X 10.15. Verified as fixed using Firefox 75 beta 10 and the latest Nightly 76.0a1 on Mac OS X 10.15 (no crash occurs when following the steps from Comment 5).