Without needing to go and override things like the entire webbrowser, the ability to choose what color a site is (background and text color), and what font size the text is at, would really aid in viewing the site.
Social media sites are ones you're more likely to view on public computers, so they're more likely to be ones this is a bigger deal for. Font size and color both can really determine whether or not someone is able to read the site or not.
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