Upping the severity as I think this warrants more attention/prioritization now that I understand what is going wrong and how common this is likely to be for users with particular patterns (effectively open a tab, move away from it, and return later, on 32-bit OSes).
Bug 1709679 Comment 36 Edit History
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Upping the severity as I think this warrants more attention/prioritization now that I understand what is going wrong and how common this is likely to be for users with particular patterns (effectively open a tab with blob recordings with embedded images, move away from it, and return later, on 32-bit OSes).