Please ignore the above attachment since the scrollbar faded before I could capture it properly in a screenshot. Here's a better one from 109.0b1 on macOS 12. I filled bug 1805367 as a regression, potentially caused by this fix.
Bug 1543036 Comment 24 Edit History
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Please ignore the above attachment since the scrollbar faded before I could capture it properly in a screenshot. Here's a better one from Fx Nightly on macOS 12. I filled bug 1805367 as a regression, potentially caused by this fix.