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Browser themes

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Since the latest update my screen comes up black background with white writing (DARK theme). Even changing theme and saving, bookmarks, history etc still have black background. If I shut FF and restart it, everything defaults to DARK theme. Hard to read and annoying. Is this a bug or how can I change permanently? Regards, Richard Ferguson.

Since the latest update my screen comes up black background with white writing (DARK theme). Even changing theme and saving, bookmarks, history etc still have black background. If I shut FF and restart it, everything defaults to DARK theme. Hard to read and annoying. Is this a bug or how can I change permanently? Regards, Richard Ferguson.

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A comprehensive review of the issue (which has raised a storm): https://support.mozilla.org/en-US/questions/1364418#answer-1474290

If that doesn't solve the issue, there is userChrome.css. Another user obtained partial success using autoconfig: https://support.mozilla.org/en-US/questions/1366357