The fix for bug 1702100 needs to be extended to 10.14 + 10.15.
Bug 1704102 Comment 0 Edit History
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This was fixed for macOS 11 in bug 1702100, but it uses an API that's not available before macOS 11. Steps to reproduce: 1. Be on macOS 10.14 or 10.15. 2. Enable System Dark Mode. 3. Open a context menu. Expected results: The menu should have a dark appearance. Actual results: The menu uses the light appearance. Enabling `widget.macos.respect-system-appearance` (bug 1623686) fixes this, but causes other bugs (that's why it's not enabled by default). It would be great if we could find a way to make this work without `widget.macos.respect-system-appearance`.