Hi! Right now, Firefox for Android doesn’t have a built-in setting to directly use the system font as its default for web content or UI — unlike some other browsers where this is part of the accessibility options. What you can do within Firefox settings is adjust the font size under Settings → Accessibility and, if you enable “Use system font size,” Firefox will respect your Android system’s font size preferences rather than forcing its own sizing.
For true font-family control, options are limited: Android Firefox doesn’t expose a simple way to change the default font family, and the only deeper method involves tweaking advanced preferences in about:config, which isn’t officially supported and can cause unexpected behavior.
There are community requests and ongoing discussions about adding better system font integration, so feedback like this helps influence future improvements!
