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How come changing FONTS/COLORS does NOT work after 20+ changes

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EVERY time I change my fonts/colors to suit my vision needs, Firefox overrides my choices and replaces my white text with an obnoxious yellow. I am a visually impaired vet, and it is imperative that I be able to use black background with white text for all apps.

EVERY time I change my fonts/colors to suit my vision needs, Firefox overrides my choices and replaces my white text with an obnoxious yellow. I am a visually impaired vet, and it is imperative that I be able to use black background with white text for all apps.

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Try reinstalling the app? It should fix your problem.

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Go to menu button in firefox and go to options , then select general panel. Under Fonts & Colors, use the drop-down menus to select the font and font size of your choice. Close the about:preferences page. Any changes you've made will automatically be saved.