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White bar on top of window going onto another monitor

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I've recently had an issue where there is a white bar on one of my other monitors when Firefox is maximised. I have reinstalled Firefox, restarted in Safe Mode, uninstalled it completely and tried a different build (I tried Nightly 80.0a1) and it has remained the same.

The issue does not occur on any other window or browser; I have tried Edge and Chrome and it doesn't occur on either of those.

Here is how it looks in person, and Here is how it looks when Firefox is minimised (The black bar is just the gap between my two monitors)

Here is how it looks in a screenshot (note the white line between the top of the Firefox window and my wallpaper)

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