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I cant customize my screen to dark anymore, why?

Firefox 瀏覽器外觀
John Wilkosz
John Wilkosz

I do not have the function to customize my display screen to dark anymore after the last update, why? The screen shot below used to be a White on Black screen before the last update now it Black on White and I cant change it back

I do not have the function to customize my display screen to dark anymore after the last update, why? The screen shot below used to be a White on Black screen before the last update now it Black on White and I cant change it back
附加的畫面擷圖

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