Hello I have managed to reproduce the issue with firefoxo 90.0a1(2021-05-04) on Windows 10, I can confirm that the issue is fixed 91.0a1(2021-06-24), 90.0, 90.0b10 (64-bit) and 78.12.0esr on Windows and Ubuntu. I will update the flags accordingly. Thank you!
Bug 1710796 Comment 16 Edit History
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Hello I have managed to reproduce the issue with firefox 90.0a1(2021-05-04) on Windows 10, I can confirm that the issue is fixed 91.0a1(2021-06-24), 90.0, 90.0b10 (64-bit) and 78.12.0esr on Windows and Ubuntu. I will update the flags accordingly. Thank you!