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my firefox webpages are now colored black

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After updating to Windows 11, all my Firefox webpages backgrounds are colored black even after choosing a light theme which only changes bookmarks and toolbar to white. I want white background like my old Firefox ?

After updating to Windows 11, all my Firefox webpages backgrounds are colored black even after choosing a light theme which only changes bookmarks and toolbar to white. I want white background like my old Firefox ?

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Firefox normally takes its cues from your OS settings, but perhaps something is going wrong there (or you want Firefox to look different). To override auto-detection of a dark system theme, change the "Website Appearance" selector on the Settings page to Light. This article has the details:

Change website appearance settings in Firefox

Does that work on your Firefox?