Solution: I just needed to disable Firefox Color in about:addons.
I set a theme with Firefox Color, I tried changing the theme in settings to light or dark but neither work. I’m wondering if there are other ways to do so in Firefox that I could try. I’m on zen browser which is why it may not have worked.
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Disable the Firefox Color extension to use the light/dark themes.
Or use Firefox Color itself to change the colour scheme to what you want/