Testing with current mozilla-central nightlies, I crash with the link from comment 315 on all versions of macOS (on Intel graphics hardware) going back to 10.12 (always the latest minor version of each major version). My patch from comment 333 fixes my crashes on all of them. (These crashes are all content process crashes -- aka tab crashes.) So Apple's bug goes at least that far back. And so my patch will fix a significant number of crashes. I didn't test on OS X 10.11 or earlier. I'm also not yet able to test on Intel hardware on macOS 11. Thank you very much, Alexandru, for your STR from comment 315! I would never have found it myself, except by accident. And without it I would never have been able to crack this bug.
Bug 1576767 Comment 334 Edit History
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Testing with current mozilla-central nightlies, I crash with the link from comment 315 on all versions of macOS (on Intel graphics hardware) going back to 10.12 (always the latest minor version of each major version). My patch from comment 333 fixes my crashes on all of them. (These crashes are all content process crashes -- aka tab crashes.) So Apple's bug goes at least that far back. And so my patch will fix a significant number of crashes. I didn't test on OS X 10.11 or earlier. I'm also not yet able to test on Intel hardware on macOS 11. Thank you very much, Alexandru, for your STR from comment 315! I would never have found it myself, except by accident. And without it I would never have been able to crack this bug (on Intel hardware).