(In reply to Markus Stange [:mstange] from comment #26) > Thank you for the thorough investigation and sorry about the misleading comment! No worries! I saw that your reduced testcase required `titlebarAppearsTransparent=YES` to reproduce the issue, so I'm thinking that some other property Firefox is setting is causing us to hit the same buggy Apple code path even with `titlebarAppearsTransparent=NO`. (In reply to Doug Hockin from comment #28) > I also want to thank you for working so hard on this! Good going... Thank you for the detailed bug report! It helped me reproduce this issue which has been a bit elusive.
Bug 1912338 Comment 29 Edit History
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(In reply to Markus Stange [:mstange] from comment #26) > Thank you for the thorough investigation and sorry about the misleading comment! No worries! I saw that your reduced testcase required `titlebarAppearsTransparent=YES` to reproduce the issue, so I'm thinking that some other property Firefox is setting (or change in a subsequent OS update) is causing us to hit the same buggy Apple code path even with `titlebarAppearsTransparent=NO`. (In reply to Doug Hockin from comment #28) > I also want to thank you for working so hard on this! Good going... Thank you for the detailed bug report! It helped me reproduce this issue which has been a bit elusive.