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Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

how to adjust brightness on mac mini, firefox, os hi sierra 10.13.6

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went to preferences, display, and no brightness slider is shown

went to preferences, display, and no brightness slider is shown

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The screen brightness is a Mac setting, not something that will appear in the Firefox settings page. The following websites may be helpful for you:

Hope this helps.