Webpage Background and letter change
How do I change the background for all webpages to black with letters displayed as white. I have a vision problem which inhibits my ability to view letters on a white background.
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You should be able to do that for some websites with Settings > General > Language & Appearance > Web site appearance. For others I suggest an extension called Dark Reader.
https://support.mozilla.org/en-US/kb/change-web-appearance-settings-firefox https://addons.mozilla.org/firefox/