White line at the top of fullscreen window
I'm not sure when it started happening, but whenever I'm watching something full screen, or just full screening, Firefox on Mac, there's this thin white line at the top of the window that's very distracting. Has this been happening to anyone else and does anyone else know how to get rid of it?
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Can you try restarting into Troubleshoot Mode (from Help menu) how it works without customizations enabled, and also trying out a few other themes to see if there's any difference?
Troubleshoot mode seemed to do nothing, but changing to a light theme temporarily fixed it. But any dark theme selected and the bar returns, seems to be a bug with every dark theme
Can you share your macOS version please? (It doesn't exhibit for me on 15.7.9 Sequoia trying a couple of dark themes.)
Currently on MacOS 27 Golden Gate. I think it was here in Tahoe too
Oh and is the underlying system theme light or dark?
Underlying theme is system, light or dark depending on the time of day.
Right and it reproduces using dark browser theme in both system–level light and dark appearances throughout the day the same way?
Anything specific on the system? Using a built–in display, or an external monitor, using the system resolution or setting some custom fractional scaling (i.e. "bigger text", "more content" or any other non–retina scaling), or running any accessibility accommodation features, windowing utilities, overlay apps, virtual display or video capture solutions etc.?