I was able to reproduce it on macOS. It looks like it is a race condition with the `pagehide` event. So far the try runs look good. I'll submit a patch later today.
Bug 1631362 Comment 23 Edit History
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I was able to reproduce it locally on macOS. It looks like it is a race condition with the `pagehide` event. So far the try runs look good. I'll submit a patch later today.