+++ This bug was initially created as a clone of Bug #1551990 +++ Bug 1551990 was speculatively fixed by disabling AppNap. However, some users still report Firefox hanging on macOS after the computer is awakened from sleep.
Bug 1567018 Comment 0 Edit History
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+++ This bug was initially created as a clone of Bug #1551990 +++ Bug 1551990 was speculatively fixed by disabling AppNap. However, some users still report Firefox hanging on macOS after the computer is awakened from sleep. See bug 1551990 comment 32 and later for more details.